US1769897A

US1769897A - Lubricating-oil purifier

Info

Publication number: US1769897A
Application number: US537128A
Authority: US
Inventors: Edmund E Hans
Original assignee: Individual
Current assignee: Individual
Priority date: 1922-02-16
Filing date: 1922-02-16
Publication date: 1930-07-01
Anticipated expiration: 1947-07-01

Description

July 1, 1930. v E. E. ANS 1,769,897

LUBRICATING OIL- PURIFIER Original Filed Feb. 16. 1922 '7 Sheets-Sheet l N .Ww iv 1530141715! fhno.

July 1, 1930.

E. E. HANS 1,769,897

LUBRICA'IING OIL PURIFIER Original Filed Feb. 16. 1922 7 Sheets-Sheet 2 I N VEN TOR.

Edmund Zlvmi:

WMM

AT ORNEY.

J y 1, 1930. E. E. HANS 1,769,897

- LUBHICATING OIL PURIFIER Original Filed Feb. 16. 1922 7 Sheets-Sheet 3 j INVENTOR. W V Edmund 17.1707

ATTORNEY.

y 93 E. E. HANS 1,769,897

LUBRICATING OIL PURIFIBR Original Filed Feb. 16. 1922 7 Sheets-Sheet 5 INVENTOR.

By Edmund Efikam ATT RNEY.

July l 1 3 E. E. HANS 1,769,897

LUBRICATING OIL PURIFIER Original Filed Feb. 16. 1922 7 Sheets-Sheet 7 11-wa as.

g INVENTOR- F Edmund/EHans.

A TTORNEY.

STATES nniamvn r. HANS, or nnrnom- MICHIGAN nUBnrcarmG-on. runrrmn Application filed February 1e, 1922,-s r1a11eo.531, 12s. mam February 19, 1929.

This invention relates to means for sepa-" rating the lighter hydrocarbons, such as gasoline and kerosene, from the lubricating oils used in internal combustion engines, and its object is to provide a device of this character which will conduct the lubricating oil from the storage reservoir, usually thecrank case, to a purifier which is preferably attached to the exhaust manifold of the engine where the lubricating oil may be heated sufficiently to volatilize the non-lubricating liquid impurities, and then conduct the purified oil to a receptacle from which it may pass to the moving parts of the engine.

A further object of this invention is to provide means for controlling the temperature of the oil in the purifier so as to avoid overheating.

Another object of this invention is to provide means for. removing the non-volatile or solid impurities in the lubricating oil.

This invention consists, in combination with a heating device, preferably the exhaust manifold of an internal combustion engine, of a purifying chamber attached to such heating device and preferably having an oil container extending into such exhaust passage, and adapted to receive the lubricatingoil of the engine, means to cause the lubricating oil to flow from the general storage device of the engine to the purifier, a'thermostat controlled by the temperature of the oil to regulate the flow of oil through the purifier, grind means to conduct the oil from the puri- It further consists in a thermostat mounted in the heating chamber and submerged in the oil therein and a valve for controlling the flow of lubricating oil to the heating chamber, the valve and thermostat being operatively connected.

It also consists in providing a pump for forcing the oil. from a crank case through the heating chamber into a filter, the filter being provided with a vent to permit the escape of the volatilized impurities.

It also consists in placing a thermostat and a valve connected thereto in the filter to regulate the flow of oil thereto.

It also consists in a by-pass whereby a certain fixed amount of oil will pass through the heating chamber and filter at all times that the engine is runinng.

It also consists in the details of construction illustrated in the accompanyingdrawings and particularly pointed out in the g claims.

In the drawings, Fig. 1 is a view of a purifying s stem for the ubricatingoil used' in interna combustion engines. Fig.2 is a section of a heater on the line 2--2 of Fig. 2, Fig. 2 is a section on the line 2 --2 of Fig. 2. Fig. 3 is a vertical section of a relief valve. Figs. 4 and 5 are views of a modified form of purifying system. Fig. 6 is an elevation of a pump. Figs. 7 and 8 are elevations of two other modified forms of purifying systems.

Fig. 9 is a section of a control valve. Fig m igs is a section of a pressure control valve. 11 and 12 are vertical sections of two modified forms of heating chambers. Fig. 12 is a section on a larger scale of the control valve used in the mechanism shown in Fig. 12. Fig. 13 is a section of the adjusting mechanism of a valve controlled by a thermostat used in the structures shown in Figs. 11 and 12. Fig. 14 is a section of the regulating de vice for the intake valve shown in Fig. '11. Fig. 15 is an end elevation of the purifier shown in Fig. 11. Fig. 16 is a vertical section on the line 16-16 of Fig 17 of one form of that portion of a purifier which extends'into the exhaust manifold. Fig. 17 is a. section on the line 1717 of Fig. 16. Figs. 18 and 19 are vertical sections of two other modified forms of purifiers. Fig. 20 is a vertical section of a valve adapted to prevent the oil from flowing from the vent. Fig. 21 is a vertical section showing the purifying and regulating chambers encased in a poor conductor of heat. Figs. 22 and 23 are sections of two forms of thermostats. Fig. 24: is a horizontal section of a device for automatically regulating the temperature of the control chamber. Fig.25 is a similar section for doing'the'same manually. Fig. 26 is a vertical-section showin another form of casing for the purifier and t e reguluating chamber; Fig.2? is a section on the line miles.

Fig. 29 is a section of a combined urifier and filter for the lubricating oil. ig. 30 is a longitudinal section of a preheater. Fig. 31 is a section of a re ulator to control the flow of oil to the uri er.

Similar re erence characters refer to like parts throu bout the several views.

The lubrlcating oils used in internal combustion engines of automobiles not only become foul with impurities in the form of minute articles of metal and road grit, but the ecome so diluted with the condensed hy rocarbons of the fuel that the lubricating qualities are lost. Automotive engineers usually recommend the draining of the oil receptacles and substitution of fresh lubricant whenever vehicles have run five hundred It has been found that in many engines this renewal of the oil is not sufficient as the oil becomes dangerously impure when the vehicle has run a much shorter distance. By the use of the present invention the lubricating oil may be kept substantially pure at all times and at the same time the danger of running the oil through overheating is avoided. The resent invention may be embodied in a num er of constructions, each of which 'is adapted to heat the oil to vaporize the lighter hydrocarbons and each embodiment is provided with a thermostat to control the tem rature of the heated oil so that it will not ruined by overheating.

In Fig. 1 is shown an engine 1 having an exhaust manifold 2, a carbureter 3, a fan 4, a radiator 5, a crank shaft 6 with a bevel gear 7 thereon, a double pump 8 of any desired construction havin a vertical shaft 9 carrying a gear 10 whic meshes with the gear 7 on the crank shaft. It will be understood that any other desired means may be used to drive thepum If desired, two pumps ma be substitute for the double pump herein s own. v

The suction pipe 11 of the lower art of the pump extends down to nearly t e bottim of the crank case 12 and at preferably the lowest point thereof so that the pump may take up the more impure portions of the lubricating oil. The discharge. pipe 13 of this lower pump extends tothe filter 14 where the solid impurities are retained, the filtered oil passing through the pipe 15 to the suction pipe 16 of the u per portion of the pump. Any desired type 0 filter ma be used, as its construction forms no part 0 the present invention. Attention, however, is called to the fact that this filter is formed with radiat ing fins 17 so that the lubricant may be cooled thereby. An observation chamber 15 may be connected into the pipe 15 and a similar device 43 into the i e 43 if desired.

The suction pipe 0 t e upper portion of the ump extends down into the crank case, but its lower end is above the intake end of the suction pipe 11 so that the lubricant which enters the upper portion of the pump through the pipe 16 W11]. be liable to have less solid impurities than the oil that is drawn up through the pipe 11. This is especially true in view of the fact that the filtered oil from the filter 14 passes directly to this pipe 16. The discharge pipe 18 of this pump may connect to a T 19 from which a pipe 20 ma extend to the bearings of the engine, while a second pipe 21 extends to a purifier 22, which is more clearly shown in igs. 2 and 2'. In view of the fact that the filter 14 and the purifier 22 may become clogged, relief valves 23 are connected to the pipes 19 and 13 so that breakage of the parts of the pump or the devices connected thereto may be avoided. This is especially of value in the winter time when the lubricant becomes auite stiff and difficult to move. While an esired type of relief valve ma be employe that'shown in Fig. 3 will be ound satisfactory and it consists of a body 24 having a cap 25 to hold the spring 26 which presses the ball valve 27 against its seat, the short connector pipe 28 being flan ed at its upper end and gripped between the ody 24 and the nut 29. The body is formed with relief openings 30 of any desired size and the pressure under which the valve 27 will lift is controlled by the stiffness of the spring 26. These relief valves are within the crank case so no loss f oil results when they act.

The purifier consists of a narrow body 22 having a downward extension 33 which is inserted in a slot in the upper part of the exhaust manifold 2, the purifier having flanges 34 which may be secured to the exhaust manifold by means of screws 35. A cap 36 is secured to the body 22 by means of screws 37 and a suction pipe 38 connects into this cap and extends down to the air intake pipe 39 of the carbureter 3. Any well known design of stove 40 may be used to heat the air drawn in through this pipe 39 and the suction of the engine will-,also cause the volatilized impurities of the lubricant in the chamber 22 mixed with airentering through the opening 32 to pass 'to the carbureter through the pipe 38. The lubricant passes into the purifier. 22 through the pipe 42 which discharges near the bottom of the container 33 and then slowly rises and overflows through the pipe 43 which extends down into the crank case and preferably connects to the intake pipe 11 of the filter pump.

The lubricating oil forced through the pipe 19 by the pump will flow to the hearings in suflicient quantities to thoroughly lubricate them, but the passages to the bearings are of such small size that the larger amount of Inbricant will flow up through the pi 21 to the purifier 22. The temperature of the exhaust gases is sufiicient to highly heat the oil in this purifier, a temperature of 300 degrees and more being attainable, which is sufiicient driven by the shaft from any desirable part of the engine. The discharge pipe 52 of this pump connects to the filter 53 and the lubricant passes from the filter to the filler opening 54 of the crank case through the pipe '56 so that when the cap 57 is removed the flow of the oil from the filter 53 can be accurately observed. A pressure gauge 58 may indicate the pressure in the filter and is shown to be connected to the pipe 52.

The upper portion 60 of the pump'has a suction pipe 61 whose open end is some distance above the bottom of the sump 47 so that the oil which enters this suction pipe will be much more free from solid impurities than that which enters the pipe 48. The discharge pipe 62 of this pump connects to a pipe 63 which extends to a a pressure indicator 64 which may be. mounted on the dashboard 65 of the vehicle. This pipe 63 also connects to the intake 66 of a purifier mounted on the exhaust manifold 67. The construction of this purifier will be more specifically described hereafter. The discharge pipe 68 from the purifier may extend to the same filler opening 54. A relief valve 69 is connected to. the pipe 62. Fig. 4 also shows an oil pan 70 mounted in the crank case 46, the oil pan having depressions 72, one for each connecting rod 73 to hold oil, the oil being splashed up in the usual manner b means of fingers 74 on the lower ends of the connecting rods. The oil from therelief valve 69 flows into the adjacent depression or receptacle 72 but it is evident that any other means may be connected to the pipe 75 onthis relief valve in order to convey the oil to the several receptacles 72. The engine shown inFi 5 is formed with a crank case 78 having a epression or sump 79 into which the suction pipe 80 of the pump 81 extends. The discharge pipe 82 of this pump connects to a relief valve 84 whose-relief pipe 85 extends to the T86. From this T a pipe 87 extends to the purifier 88. From the relief valve 84 the pipe 89 extends to the filter 90 and under normal conditions the oil flows through this pipe 89, through the filter 90 and through the pipe 91 to the pipe 87, but should the filter become clogged so that oil cannot pass through, then the relief valve 84 will permit the oil to pass directly to the T 86 through the pipe 85.

Part-ofathe purified oil leaves the purifier 88 through the pipe 93 and flows through a chamber 94 which has a transparent front and then to the crank case 78 through the pipe 95. Another ortion of the oil from the purifier 88 flows t rough the pipe 96, through a second chamber 97 havlng a glass front, and then through the pipe 98 to parts of the engine to be oiled.

In Fig. 6 a pump 81 is shown havin a suction pipe 80 and a discharge pipe 82, ut the bottom 99 of the crank case has no sump and the intake end of the suction pipe 80 is therefore spaced but a short distance from the bottom of this crank casein order that the more impure oil may be taken up thereby. This difference in the construction of the, crankcase and in the position of the intake constructions shown.

In the construction shown in Fig. 7 the suction pipe 100 of the pump 101 extends down into a sump 102 in the bottom of the pipes'of the pumps may be used in the several crank case 103 and the discharge pipe 104 of a the pump connects to the intake 105 of the purifier 106 which is mounted on the exhaust manifold 67 of the engine 1. The pipe 107 connects to this purifier 106 and to the filter 108 so that all of the lubricating oil which passes through the purifier '106 must pass through the filter 108. The fins 109 on this filter will reduce the temperatureof the oil as it asses through and this oil leaves the filter t rough the pipe 110 and passes back' to the crank case.

Observation chambers

107 and 110 may be connected into the

pipes

107 and 110 respectively, if desired.

In Fig. 8 the suction pipe112 of the pump 113 extends into a sump 114' and the dis-- charge pipe 115 of this pump connects to a T 116 from which a pipe 117 extends to the lubricatin s stemof the engine. A pipe 118 exten s fi 'om the T 116 to the filter 119 from which the oil passes back to the crank case through the pipe'120. In order to regulate the fiow of the lubricant from the pump 113 to the lubricating system of the engine andto the filter, one or more pressure relief valves 122 maybe connected into this filtering system. These relief' valves may be either positively adjustable as shown in Fig. 9, or spring controlled as showif in Fig. 10.

In Fig. 9 the body A has a valve B posiuntil the pressure in the pipe K is sufiicient to lift the valve G from its seat. If there is any pressure in the pipe L, then the excess ofpressure in the pipe K over that in the I A pipe L must be suflicient to lift this valve G.

. walls of this receptacle 125 The relief valve 122 in the pipe 118 may be omitted if the valve in the pipe 120 is used, and vice versa. If the filter becomes clogged, all the oil must pass to the bearings through the pipe 117.

1 Figs. 11 and 15 show a purifier adapted to.

be attached to the exhaust manifold 67 of the engine. This device is preferably formed of a lower portion or heater of copper, and a cover 126 which are secured to the exhaust manifold 2 by means of screws 127, gaskets 128 being employed if desired. A series of pipes 129 extend across between the side for the purpose of permitting more intimate action between the exhaust gases and the lubricating oil. The oil enters this heating device through a pipe 130 which connects to a hood 131 and then passes through a screen 132. The hood 131 is attached to a cylindrical hub 133 on the cover 126 just above a valve chamber 134. The valve 135 (Fig. 14) has astem in two portions 136 and 137, the former being in two parts having a disk 138 at its upper end as shown in Fig. 14. A coupling 139 connects into the hood 131 and receives a guide sleeve 140, on the upper end of which is a cap 141 which receives the thrust of the spring 142 mounted on the disk 138. The two part valve stem permits the coupling 139 and all the parts carried thereby to be removed and the distance of this spring 142 from the oil receptacle 125 insures the spring remaining cool at all times.

The valve chamber 134 is formed with an upward extension on which a guide 144 is mounted and this extension has holes 145 to rmit the entrance of oil. The lower stem 137 of this valve is preferably formed as shown in Fig. 13, that is, provided with a screw threaded extension 147 adjustable in this stem 137 and locked therein by means of a nut 148; This device which spaces the spring 142 away from the heated portion of the urifier so as to save the spring may be use with any of the other modifications of this purifier. The fact that the coupling 139, the cap 144 and the valve 135 can be readil removed permits adjustment of the threa ed extension 147 which constitutes an adjustment of the thermostat and controls the temperature of the oil in the purifier. The extension 147 therefore controls the final temperature of the oil.

Mounted within the cover 126 and attached to the valve chamber 134 by means of a nut 149 is a two-metal thermostat 150 whose free end 151 is adapted to bear against the lower end 147 of the stem of the valve 135. This thermostat is below the level 153 of the oil in the purifier and therefore is controlled directly by the temperature of this oil. So long as the oil in the purifier is below a predetermined temperature, the valve 135 remains on its seat and prevents the entrance of additional oil. But as soon as the temperature of the oil rises above the predetermined point, the free end 151 of the ther mostat lifts the valve 135 from its seat and permits oil to flow through the openings 145 down around the lower stem 137 of the valve and out through the opening 154 into the heating chamber.

The oil within the purifier soon becomes sufliciently hot to cause the evaporation or the volatilization of the gasoline, kerosene and other light hydrocarbons which rendered it useless for lubricating purposes and this vapor rises in the dome 155, passing the baffie plates 156 which prevent the upward passage of particles of oil, and escape through the pipe 157 which preferably connec s to the air intake pipe of the carbureter in the man ner of the pipe 38 shown in Fig. 1.

In order to prevent the oil from being drawn up through this pipe 157 and into the carburetor, a pipe 158 connects to the upper part of the dome and to the valve body 159. In this body is a light check valve 160 which is lifted to permit the inflow of air whenever there is suflicient suction in the pipe 157 and which is before the oil in the purifier can be drawn into the carbureter. This valve 160 is closed while the engine is at rest and therefore prevents the fumes from the purifier from entering the space underneath the hood of the automobile.

The purified oil rises in the pipe 162, which may be of any length and stop at any desired distance from the bottom of the chamber 126, and flows through the pipe 163 to the indicator 164 which is provided with a window in any desired manner so that the flow of oil can be watched. This pipe 163 is vented by the short pipe-165 to prevent the oil in the purifier from being siphoned. A pipe 167 connects to the hood 131 and also to the indicator 164 in order to permit the oil in the hood 131, if it should rise that high, to overflow to this indicator and thence down through the pipe 169.. If the oil in the purifier should rise as high as the opening 170 in the hood 155, to which the pipe 171 connects, such excess of oil will pass down through the pipe 171 to the T 172 which connects to the pipe 169 and the oil from the

pipes

169 and 171 will then pass to the crank case by means of the pipe 173.

Instead of the chamber 125 with its parallel walls and the pipes 129, the lower chamber of the purifier which extends down into the exhaust manifold may be formed as shown in Figs. 16 and 17. In this case the two sides 176 are formed with integrally projecting vertical bosses 177 which may be connected by means of rivets 178. These bosses reinforce the sides 176 and therefore permit of the use of very thin sheet metal. This structure is then able to resist the pressures of the exhaust cylinders.

In the structure shown in Fig. 12 a conduit 180 of asbestos or similar poor heat conducting material is mounted on the exhaust manifold 67 and the oil receiving chamber 181 extends down through slots in this conduit 180 into the exhaust manifold. The sides 182 of this receptacle are parallel to each other and quite close together and bolts or pins 183 keep them properly spaced and also conduct heat from these plates to the oil within the receptacle. The cover 184 and this receptacle 181 are provided with flanges 185 which may be separated by means of a gasket 186 and all the parts ma be secured to the conduit 180 by means 0 screws 187. The lubricating oil passes to the heater through the pipe 335.

In Fig. 12 is shown the construct-ion of the control valve for this purifier. The hood 189 is attached to the upper side of this cover 184 and the valve body 190 to the lower side. The oil enters this purifier through the pipe gases as they issue from the 335. The valve 191 is normally pressed onto its seat by the spring 192 but may be lifted by the thermostat 193. Valves 194 in the con duit 180 control the flow of air, the valves being connected by the rod 195. A lever 196 pivoted under a hood 197 connects to one of the valves by a link 198 and a rod 199 at the other end of the lever has its lower end in the path of the free end of the thermostat. The valves 194 are not opened until the oil in the receptacle. 181 becomes undesirably hot. A spring 201': may be used to keep them closed. The pipe 336 conducts the oil from the center of the upper portion of the purifier to any desired point of connection with the lubricating system of the engine. Air may enter and leave through the

pipes

337 and 338, and if desired, the pipe 337 may be connected to the air intake of the carbureter. Screens 339 prevent oil being splashed up to the end of this pipe.

In the construction shown in Fig. 18, 'a cooling c'hamber 201 is mounted on the exhaust manifold 67, and the cover 202 of the purifier' as a flange 203 which engages the flange 2 of the container 206 and presses it against the cooling chamber 201 through the action of the bolts 205. The container 206 extends down within the cooling ring 201 into the exhaust manifold and the lubricating oil is heated therein to the desired temperature but because of the intervening ring 201, the heat of the exhaust manifold itself cannot be communicated to the cover 202 and ,thus interfere with the action of the thermostat. It will be understood that instead of a cooling chamber 201 supplied with circulating water, a block of asbestos or other poor heat conductor may be employed. The lubricating oil enters through the pipe 208 and passes the valve 209 when the same is saine as that shown in F ig. 13. The oil flows down through the passage 215 and out through the lateral openings 216, the flow being controlled entirely by the temperature of the oil in this heating chamber. The oil flows up from the heating chamber through the pipe 217 to the passage 218 and then through the pipe 219 to the crank case, or wherever else it is to be used. The

pipes

220 and 221 connect into the water chamber 201.

The small hood 222 receives the volatilized impurities which pass out through the opening 223. If oil passes into this heater faster than it can be carried off by the pipe 217 and reaches the passage 224, it will flow throu h the same to the vertical passage 225 to t e opening passage 218 and then out through the larger pipe 219. This prevents the oil from passing out through the opening 223 which may occur especia foaming take place in the heating cham er.

In Fig. 20 is shown an alternative device. Instead of permitting the oil to flow through the

passages

224 and 225, a small float 227 may be mounted on a vertically slidable rod 228 which has a valve 229 at its upper end adapted to close the passage 230 of the hood 231,- which is employed in place of the hood 222, shown in Fi 18.

In the re ning of petroleum it has been found that the lighter hydrocarbons can be more readily removed from the heavier when the liquid is passed through several heating chambers. The exact reason for this peculiarity of petroleum is not understood, so far as I know, but the fact is pretty well known. In Fig. 19 a urif ing device is shown which embodies t

ree heating chambers

235, 236 and 237 all connected to a cover 238. Over the heater 235 is a hood 242 which may be of the same construction as the hood 222 shown in Fig. 18. The thermostat 244 controls an intake valve by means of the stem 215, but a pipe 245 connects to a discharge opening of the valve 243 and conducts the incoming oil to the bottom of the container 235. The oil slowly rises in this container until it comes to the overflow pipe 246, through which it passes to the bottom of the container 236 and from there it passes through the pipe 247 to the bottom of the container 237 and it leaves the heater 237 through ly when boilin or the pipe 248. The fumes from the heaters purifier is mounted. Any desired overflow conductor may be employed.

In Fig. 21 is shown a urifier similar to that shown in Fig. 11. he exhaust manifold 252 has secured to it a plate 253 and channel shaped bars 254 of asbestos board held in position by means of metal channels 255. The flange 256 of the purifier instead of being secureddirectly to the manifold is o secured to the top of these channels 254 by Attention is directed to the fact that during hot weather the air around the exhaust passages is hotter than in the winter and that the dilution of the oil is greater in the winter than in the summer. The purifying capacity of the devices shown in the drawings is therefore less and the work to be done is therefore greater in the winter than in the summer. The oil is also much colder in the winter and thus increases the load on the purifier. In order to equalize the actions of the purifiers as much as possible, the followin devices are suggested.

Enc osing the cap 126 and hood 155 and the other portions shown in'Fig. 11 above the late256 is a block 259 of asbestosheld in p ace by means of a sheet metal cap260. This block 259 and cap 260 will be mounted in the osition sho'wn during cold weather, but wi usually be found unnecessary in the summer. The cap may be held in position by means of screws 261.

' The flow of the air around the oil rece tacle 125 and between the walls 254 may e controlled by means of the device shown in Fi 24. A small chamber com osed of the wa Is 263 and 264 extends up rom the exhaust manifold 252 and encloses a thermostat 265 attached to the wall 263. The heat conducted directly by the wall 263. and by the air imprisoned between the

walls

254, 263 and 264 affects this thermostat 265, which in turn swings the bell-crank lever 266 connected to a small shaft 267 by means of a link 268 and crank 269. On this shaft is mounted a valve 270. Another shaft 271 carries a valve 272 and the crank arms 273 on these shafts are connected by a link 274. The temperature of the exhaust pipe will therefore control the openings of these

valves

270 and 272 and thereby the flow of air around the upperportion of the oil container 125. Increased opening of these valves permits additional flow of air around the chamber 125 and thus prevents the overheating of the upper portions of this purifier.

Instead of a thermostat 265 to regulate these valves, the device shown in Fig. may be employed, which consists of a rod 278 extending through the dash-board 279 and connecting to the crank arm 269. The so-called motor-meter or thermometer which is mounted on the filler cap of the radiator of an automobile indicates the temperULure of the circulating water and the general temperature of the engine, and the

valves

270 and 27 2 may be controlled manually according to the temperature indicated by such device.

In Fig. 27 two air passages are shown, one similar to that indicated in Fig. 24 and a second one above it. The air passing through the lower passage 281 is controlled by two

valves

282 and 283 connected together by means of a rod 284, while the upper passage 285 which extends around the' cap 126 is controlled by

valves

286 and 287. Any desired means may be employed for adjusting these valves, and in Fig. 28 I have shown a button 288 which may be attached to the shaft 289 of one of the valves. It is obvious that the automatic control shown in Fig. 25 may be employed for the two sets of valves shown in Fig. 27. The two pairs of valves may be operated singly or together.

In Fig.26'the construction of the walls of these passages is more clearly shown. The asbestos board channels 254 and the metal channels 255 are held in position by the same screws 257 that secure the plate 256 and the heating chamber to the exhaust manifold in the same manner as shown in Fig. 21. The metal cap 260 has a linin 291 of poor heat conducting material and,i desired, a second lining 292 of metal to hold this inert material in position. The shafts 289 for the valves are indicated in dotted lines.

It may be found desirable to filter the oil .as it leaves the purifying chamber in order to remove the particles of metal, road grit and other non-volatilizable impurities. A construction such as shown in Fig. 29 may be found advisable for this purpose. In this case the exhaust passage 295 is shown formed with an integral annular chamber 296 into which the oil flows through the pipe 297Iand from which it passes through the pipe 298 into a valve chamber 299, which has a cap 300.

This valve chamb or is formed on the cover 302 of a filtering device which has secured to it a shell 03 preferably provided with radiating fins 304. A sleeve 305 is mounted in the chamber 299 and secured therein by means of a nut 306, and in this sleeve is mounted a stem 307 having a valve 308 intermediate its ends which is adapted to seat at the top of the sleeve. The upper end of this stem 307 is guided in a central hole 309 in the cap 300, and the valve-is normally held on its seat by means of the spring 310. The

,stem 307 may have an extension 311 conc eptacle. The hot oil in this receptacle 313 controls the operation of the thermostat 312 and therefore of the valve 308, the valve being opened to permit a more rapid flow of oil throughthe heating chamber-296 as the temperature of the oil increases. From the receptacle 313 the oil flows through the small passage 315 into the shell 303 and around a shell 316 between which and the receptacle 317 a filterin material 318 is properly packed. This ltering material is preferably compacted horse-hair. It will be noticed that the oil flows down at the left side of the shell 303 (Fig. 29) and up on the right side to the opening 319 in the shell 316 then around through the filtering material 318 and'finally discharges into the receptacle 317 through the pipe 320. After reaching the top of the discharge pipe 321 the filtered oil flows down this pipe to the crank case or wherever else it may be desired to use it. It will be noticed that the heaviest particles of the impurities will lodge in the bottom of the receptacle 313, that the oil with the smaller particles of impurities will slowly flow to the bottom of the shell 303 where a large proportion of the remaining impurities will be deposited.

- Thereafter the fine and substantially impalpable impurities will .be taken up by the filtering material 318, but should any pass through this filtering material, most of them will be caught in the receptacle 317 and lodge on the bottom thereof. Substantially pure oil will flow down through the pipe 321. Any other valve chamber construction may be'substituted for that shown in Fig. 29. Attention is called to the small passage 322 in the wall of the valve chamber whereby oil may'by-pass the valve 308. This is necessary to insure oil passing around the thermostat for until it does this the thermostat will not act and the oil in the chamber 296 may become overheated. A covering of asbestos 323 may be attached over the chamber 296 to insure sufficient heating of the oil during cold weather and prevent overheating during hot weather. The vent 324 permits the escape of the volatilized impurities."

The thermostat used in this connection may be of any desired construction, but I prefer that it be similar to the thermostat shown in Fig. 22 or that shown in Fig. 23. The valve body 215 shown in these two drawings is the same as that shown in Fig. 18 and is again provided with the lateral passages 216 for the escape of the incoming oil. The valve stem 146 shown in these views is the same as that shown in Fi 13 and it is again provided with the adjusta le extension 1 17. The twometal thermostat 210 is secured to the bottom of this valve chamber 215 by a nut 325.

. Instead of the thermostat contacting directly with-the adjustable extension 147, I prefer to mount an arm 326 between the stationaryend of the thermostat and the valve body 215,

this arm being provided with an eye 327 to contacts with this arm-331 nearer its pivot than the point of contact of the rod 147 and this results in a multiplication of the movement of this rod 147 over that of the free' end of the thermostat.

Instead of an arm331 such as shown'in Fig. 22, I may employ an arm 334.- made'of-i two metals so that it will also serve as a thermostat and assist the thermostat 210 in its action on the valve stem 146. It will be understood that the action of the thermostat is most pronounced at about the highest tem perature of evaporation of the volatilizable impurities. At very low temperatures this thermostat will open out, that is, the-free end will swing down, and I prefer to leave plenty of space in the'heating chamber for this movement.

It'may be desirable to preheat'the oil before it enters the purifiers shown in the several views of the drawings, which preheating may be particularly necessary during cold weather. A small chamber 336 (Fig. 30) may be mounted to extend into the exhaustpassage 337 of the engine, being held in position by the cap 338. The pipe 339 from the oil pump connects to this cap in is turned clockwise ninety degrees and the valve 3 11 the same amount in the o posits direction, oil will flow through this pre. eater. A vent pipe 346 connects to the cap and to a groove 347 to permit the escape of fumes when the parts are as shown in Fig. 30 and the oil remaining in the'ohamber 336 burns away. It is evident that an desired number of these preheatersmay e connected in series.

In Fig. 31 I have shown a pipe 348 to conduct the oil to the purifier 349, which pipe is provided with a small calibrated plug 350 whose opening 351 is just sufiicient to admit the right amount of oil to the purifier when the oil therein is at its highest temperature. This device prevents the entrance of more oil than the overflow will take care of and therefore prevents the loss of oil through the vent pipe.

While many changes in the proportions; and deta lof this purifying system have been shown in the drawings, it will be understood that many more can be made by those-skilled in the art without departing from the sp rit of my invention as set forth in'the following claims. The details of construction in the various modifications of this purifying system may of course be interchanged as may be desired, that is, the heating chambers of the purifiers may be interchanged and m the system shown in Fig. 29 any other desired purifier may be employed in place of the oil heating chamber 296. On the other hand, any other kind of a filtering device maybe substituted for that shown in that figure in combination with any one of the purifiers shown in the several views.

I claim 1. In a purifying system for the lubricating oil of an internal combustion engine, the combination of a pump for drawing the oil from the main reser -.'oir of the engine, a filter, pipes conveying the oil from said pump to the filter, a second pump, a pipe for conveying the oil from the filter to said second pump, a purifier mounted adjacent to the exhaust assage of the engine and having an extension in the path of the exhaust gases, a pipe extending from said pump to the purifier, and a ipe extending from the purifier to the inta e pipe of the pump which forces the oil to the filter.

2. In a purifying system for the lubricating oil of an internal combustion engine, the combination of a pump for drawing the oil from the main oil reservoir of the engine, a filter, a pipe conveying the oil from said pump to the filter, a second pump, a pipe for conveying the oil from the filter to said second pump, a purifier mounted adjacent to the exhaust passage of the engine and having an extension in the path of the exhaust gases, a ipe extending from the purifier to the inta e pipe of the pump which forces the oil to the filter, and relief valves in the pipes leading from said pumps to the filter and to the purifier respectively.

3. In a purifying system for lubricating oil of internal combustion engines, the combination of a pump, a filter, a purifier attached to the exhaust passage of the engine, a pipe leading from the pump to said filter, a relief valve in said pipe, a second pipe leading from the filter to raid purifier, a connecting pipe between the pipe leading from the filter to the purifier and the relief valve between the porn and the filter, adischarge pipe for said puri er, an overflow pipe leading from said purifier, and a visible indicator whereby the flow of the oil through the pipes leading from the purifier ma be observed.

4. In a puri ying system for the lubricating oil of internal combustion engines, the combination of a purifier adjacent the exhaust passage of an internal combustion engine, means for conveying oil thereto, a pipe leading therefrom to the parts of the engine to be lubricated, a second pipe leading from said purifier to the main oil reservoir, and an indicating chamber having a transparent side through which the flow of oil from said purifier may be observed.

- 5. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprising a container extending down into the exhaust passage and a cap for said container, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said container into a passage in said cap, and an overflow pipe leading from said passage.

6. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprising a container extending down into the exhaust passage and a cap for said container, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil into said chamber, a thermostat within said chamber ada ted to controi the position of said valve, a pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leading from said passage, a hood mounted on said cap to receive the vaporized impurities, and a pipe leading from said hood to convey away the vaporized impurities.

7. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprising a container extendin down into the exhaust passage and a cap or said container, a valve chamber mounted on said cap, a valve in said chamber .to control the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said alve, a pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leading from said passage, a hood on said cap and an overflow pipe leading from said hood.

8. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purif ing chamber comprising a container exten in down into the exhaust passage and a cap or said container, a valve chamber mounted on said cap, a valve in said chamber tocontrol the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said container into a assage in said cap, an overflow pipe leading rom said passage to the intake in'eaee'r mounted on said hood to admit air when the suction therein exceeds a predetermined limit.

9. In a purifying system for the lubricating oil of internal combustion engines, the combination of a pump for drawing the oil from the lowermost portion of the main oil .receptacle of the engine, a filter, a pipe con veying the oil from said pump to the filter, a second pump, a pipe for conveying the oil from the pipe to the second pump, a purifier mounted adjacent to the exhaust passage of the engine and having an extension in the path of the exhaust gases, a pipe extending from said pump to the purifier, a pipe extending from the purifier to the intake of the pump which forces the oil to the filter, a relief valve in the pipes leading from said pumps to the filter and to the purifier respectively.

10. In a purifying system for the lubricat ing oil of Internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprlsing a containerv extending down into the exhaust passagennd a cap. for said container, a valve chamber mounted on--said cap, a' valve in said chamber tocontrol the fiow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leading from said passage, said container having parallel sides formed with integrally projecting bosses, and means to connect the bosses to hold the sides in constant relation to each other.

11. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprising a container extending down into the exhaust passage and a cap for said container, a valve chamber mounted on said cap, a valve in said chamber to control the flow ofoil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said con tainer into a passage in said cap, an overflow pipe leading from said passage, and means to hold the sides in fixed relation to each other.

12. In a purifying system for the lubricating oil of internal combustion engines, the combination with an exhaust passage of the engine, a purifier attached thereto and embodying an oil container and a cap, a thermostat within the purifier, a valve controlled by said thermostat and adapted to regulate the'flow of oil into said purifier, a stem on said valve extending toward the thermostat and adapted to be actuated thereby, and an adjustable contact device mounted on said valve stem and constituting the connection between said stem and said thermostat.

13. In a purifying system for the lubricat ing oil of internal combustion engines, the

combination with the exhaust passage of the engine, a purifying chamber comprising a container extending down into the exhaust passage and a cap for said container, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leadlng from said passage, a con pling connected to said cap, a tubular guide mounted on said coupling, aspring within said guide, and a stem exten ing upward from said valve and engaging said spring whereby said valve may be held on its seat by said spring until moved therefrom by said thermostat.

14. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprising. a containerextending down into the exhaust passage and a cap for said container, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leading from said passage, an air pas sage extending around said container and between said cap and the exhaust passage, valves to control the flow of air through sai passage, and means adapted to be engaged and operated by said thermostat to open said valves to permit the flow of air to control the container when the temperature therein exceeds the desired point.

15. In a purifying system for the lubrieating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprising a container extending down into the exhaust passage and a cap for said container, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leading from said passage, a hood mountchamber to control the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a

pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leading from said passage, a hood mounted on said cap, a pipe extending from the hood to convey away the volatilized impurities in the oil, a second pipe extending from the hood. a valve chamber connected to the outer end of said pipe. and a valve in said chamber adapted to be lifted when the pressure within the hood falls below a certain predetermined point to prevent the oil from flowing through the pipe connected to the hood to convey away the volatilized impurities.

17. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber comprising a container extending down into the exhaust passage and a cap for said container, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil into said chamber, a thermostat within said chamber adapted to control the position of said valve, a pipe leading from the bottom of said container into a passage in said cap, an overflow pipe leading from said passage, a hood mounted on said cap, a cap for said hood, a pipe connected to said cap to convey away the volatilized impurities, and screens mounted in said hood to prevent the oil in the purifier being splashed to the intake end of said pipe.

18. In a purifying system for the 1ubrieating oil of internal combustion engines. the combination with the exhaust passage of the engine, a purifying chamber connected thereto and comprising a container and a cap therefor, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil, a thermostat within said chamber adapted to control the position of said valve, a passage in the wall of said cap, a pipe extending therefrom to convey away the Y purified oil," a pipe extending from the bottom of said container to said passage, and an overflow passage extending from adjacent the to of said cap to said passage.

19. n a purifyingsystem for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber connected thereto and comprising a container and a cap therefor, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil. a thermostat Within said chamber adapted to control the position of said valve, a passage in the wall of said cap, a pipe extending therefrom to convey away the purified oil, a pipe extending from the bottom of said container to said passage, an overflow passage extending from adjacent the top of said cap to said passage, and a hood on said cap provided with a discharge opening for the volatilized impurities of the oil.

20. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifying chamber connected thereto and comprising a container and a cap therefor, a valve chamber mounted on said cap, a valve in said chamber to control the flow of oil, a thermostat within said chamber adapted to control the position of said valve, a passage in the wall of said cap, a pipe extending therefrom to convey away the purified oil, a pipe extending from the bottom of said container to said passage, an overflow passage extending from adjacent the top of said cap to said passage, a hood formed on said cap having a discharge opening to permit the escape of the volatilized impurities of the oil, a valve mounted in said hood adapted to close said passage, means to guide said valve, and a float connected to said valve and adapted to lift the same when the oil therein rises above a predetermined point.

21. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifier attached to said exhaust passage and comprising a container and a cap therefor, a valve chamber mounted in said cap and a valve in said chamber to control the flow of oil into said chamber, a pipe leading from the valve to the bottom of the container, and a pipe leading from the top of saidipurifier to convey away the purified oil, the intake end of said pipe being located at the middle point of said cap.

22. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifier comprising a series of chambers each comprising a container to hold the oil to be purified and a cap therefor, a valve chamber to control the flow of oil into one of said containers. a pipe extending from said valve chamber to the bottom of said container, a thermostat mounted in said chamber and adapted to actuate the valve to control the flow of oil into said first chamber, a pipe connecting to the upper portion of said first chamber to convey the oil to the bottom of said second chamber and a pipe to convey the oil from the top of said second chamber, and a pipe connecting into the cover of said second chamber to carry off the volatilized impurities of the oil.

23. In an internal combustion engine, the combination with the exhaust passage of the engine, a purifier comprising a series of containers extending down intd the exhaust passage, and pipes for conducting oil into and from said containers consecutively.

24. In a purifying system for the lubricating oil of internal combustion engines, the combination of the exhaust passage of the engine, a purifier comprising a series of containers extending'down into the exhaust passage and a cap common to the several containers, said cap being divided into compartments, one for each container, a thermostat and a valve to control the flow of oil to the bottom of the first chamber, pipes connecting to the tops of said containers to convey the oil, and pipes connecting to the cap to carry off the volatilized impurities of the oil.

25. In a purifying system for the lubricating oil of internal combustion engines,

the combination of a purifier monted on the exhaust passage of said engine and embodying a container extending into said exhaust passage, air passages extending around the upper portion of said container, a valve to control the flow of air through said passages, and a thermostat controlled by the temperature of the exhaust passage for regulating the fiow of air through said passages by means of said valve.

26. In a purifying system for the lubricating oil of internal combustion engines, the combination of a purifier embodying anoil container extending into the exhaust passage of the engine, air passages extending around the upper part of said container, a valve to control the flow of air through said passage, and means to control the position of said valve.

27. In a purifying system for the lubrieating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifier mounted thereon and embodying a container extending into exhaust passage, a cap and a body of poor heat conducting material extending from said exhaust assage to said cap.

28. 'n a purifying system for the lubrieating oil of internal combustion engines, the comblnation with the exhaust passage of the engine, a purifier'mounted thereon and embodying a container extending into said exhaust passage, a cap, a body of poor heat conducting material extending from said exhaust passage to said cap, and a block of poor heat conducting material extending around said cap.

29. In a purifying system for the lubricating oil of internal combustion engines, the combination with the exhaust passage of the engine, a purifier mounted thereon and embodying a container extending into said exhaust passage, a cap, a body of poor heat conducting material extending from said exhaust passage to said cap, a block of poor heat conducting material surrounding said cap, and a removable shell enclosing said block and ca 50. In a purifying system for the lubricating oil of internal combustion engines, the

combination of a purifying chamber, an exhaust passage to which the chamber is attached, and members of poor heat conducting material extending around said purifying chamber to prevent the direct passage of heat thereto from the exhaust passage.

31. In a purifying system for the lubricating .oil of internal combustion engines, the

combination of an exhaust passage for the engine, a purifying chamber for the lubricating oil attached to said exhaust passage, a plurality of air passages extending around said purifying chamber, and means to con trol the passage of air through said passages.

32. In a purifying system for the lubricating oil of internal combustion engines, the combination of an exhaust passage for the engine, a purifying chamber for the lubricating oil attached to said exhaust passage, a plurality of air passages extending around said purifying chamber, and means to control the passage of air through said passages, the walls of said passages being formed of poor heat conducting material.

33. In a purifying system for the lubricating oil of internal combustion engines, the combination of a heating chamber, pipes leadin'gto and from the heatingchamber, a

filtering chamber connected to the pipe leadcontrol chamber to receive the oil from the heater, a thermostat in said chamber, a valve to control the flow of oil to said chamber adapted tobe positioned by the thermostat, and a filter adapted to receive the oil from saidchamber. 1

35. In a system for purifying the lubricating oil of internal combustion engines, the combination of means for heating the oil, a control chamber to receive the oil from the heater, athermostat in said chamber, a valve to control the flow of oil to said chamber adapted to be positioned by the thermostat, a settling chamber adapted to receive the oil from the control chamber and provided with radiating fins to cool the oil, and a filter to receive the oil from the settling chamber.

36. In a system for purifying the lubricating oil of internal combustion engines, the combination of means for heating the oil, a.

control chamber to receive the oil from the.

radiating fins to cool the oil, a filter to receive the oil from the settling chamber, a

and a filter adapted to receive the oil from said chamber, said control chamber being provided with a vent to permit the escape of the volatilized impurities in the oil.

38. In a system for purifying the lubricating oil of internal combustion engines, the combination of a chamber for heating the oil, a second chamber wherein the oil is also heated and wherein the volatile impurities are evaporated, and intermittently operated means in the first chamber for causing the oil to flow through without being substantially heated.

39. In a purifying system for thelubricating oil of an internal combustion engine, the combination of a pump for drawing oil from the main reservoir of the engine, a filter, a pipe for conveying oil from said pump to the filter, a second pump, a pipe for conveying oil from the filter tosaid second pump,

and a pipe for conducting oil from one of said second pumps to the bearings of the en- 40. In a purifying system for the lubricating oil of an internal combustion engine, a purifier mounted adjacent to the exhaust passage of the engine and having an extension arranged in the path of the exhaust gases, means to effect flow of oil to and from said urifier, and means to bring a cooling fluid into contact with the purifier to prevent overheating of the oil in the purifier.

41. In a purifying system for the lubricating oil of an internal combustion engine, a

heating chamber attached to the exhaust passage or. the internal combustion engine and projecting into the path of the exhaust gases, means for efiectin flow of oil to and from said heating cham er, means responsive to the temperature of the oil in said heating chamber to control the flow of oil to said chamber, and means responsive to the temperature of the exhaust passage for bringing a cooling medium into contact with said chamber to prevent overheating of the oil therein.

42. In a purifying system for the lubricating oil of an internal combustion engine, a chamber heated by the exhaust gases from the engine, means for effecting flow of oil to and from said chamber, an inlet valve, a thermostat responsive to the temperature of the oil in said chamber for opening said valve, said valve having an elongated stem, a tension spring engaging said stem, the tension spring being sufiiciently removed from the cham er that it is not exposed to the temperatures existing therein.

43. In a purifier for the lubricating oil of an internal combustion engine, a heating chamber, means for effecting flow of oil to and from said chamber, a valve controlling flow of oil into said chamber, a pivoted arm of thermostatic material engaging said valve, and a second thermostatic member fixed at one end and having its other end engaging said arm.

44. In a purifying system for the lubrieating oil of an internal combustion engine, the combination of a pump for drawing oil from the main reservoir of the engine, an oil conditioner, a pipe for conveying oil from said pump to said conditioner, a second pump, a pipe conveying oil from said conditioner to said second pump, and a pipe for conducting oil from said second pump to the bearings of the engine.

45. In apurifying system for the lubrieating oil of an internal combustion engine, the combination of a pump for drawing oil from the main reservoir of the engine, an oil conditioner, a pipe for conveying oil from said pump to said conditioner, a second pump, a pipe for conveying oil'from said conditioner to said second pump, an oil purifier, a pipe for conducting oil from said second pump to said purifier, a pipe for conductin oil from said purifier to the inlet of sai first pump, and a pipe for conducting oil from one of said pumps to the bearings of the engine.

46. In a purifying system for the lubricating oil of an internal combustion engine having an exhaust pipe, the combination of an oil purifier supported by the exhaust pipe and having a substantial portion contained Within said pipe, said portion being relatively long and narrow, and means for effecting flow of oil to and from said purifier.

47. In a purifying system for the lubrieating oil of an internal combustion engine having an exhaust pipe, an oil purifier supported by said exhaust pipe and having a substantial portion contained within said exhaust pipe, said portion being relatively long and narrow, means for effecting flow of oil to and from said purifier, and means to prevent overheating of the oil in said purifier.

48. In a purifying system for the lubrieating oil of an internal combustion engine having an exhaust pipe, a heating chamber supported by and having a substantial portion contained within said exhaust pipe, said portion being relatively long and narrow, means'to elfect flow of oil to and from'said heating chamber, and means responsive to the temperature of the oil in said heating chamber for controlling the flow of oil thereto.

49. In a purifying system for the lubricat ing oil of an internal combustion engine having an exhaust pipe, a heating chamber supported by and: having a substantial portion 5 contained Within said exhaust pipe, said portion being relatively long and narrow, means for supplying oil to said chamber, and a discharge pipe leading from a point adjacent the bottom of said chamber, whereby the heavy oil is withdrawn from the bottom of said chamber and coking of the same is prevented.

50. In a purifying system for the lubricating oil of an internal combustion engine having an exhaustpipe, a heating chamber supported by and having a substantial portion contained Within said exhaust pipe, said portion being relatively long and narrow, and

an inlet pipe extending nearly to the bottom of said heating chamber, whereby the incoming oil serves to agitate the oil in the chamher to prevent coking thereof.

51. In combination with an automobile engine having an exhaust manifold and an exhaust outlet pipe connection thereto, an

oil purifier mounted on said manifold ahead of the aforesaid connection, said purifier having a major oil heating portion disposed Within and completely surrounded by said exhaust manifold and by the remaining portions of the purifier, so as to be completely shielded from cooling influences, the portion disposed within said manifold being relatively long and narrow so as not to interfere with the free flow of exhaust gases from the exhaust ports of the engine to said connection.

52. In combination with an automobile engine having an exhaust manifold and an exhaust pipe connection thereto, an oil purifier mounted in said manifold ahead of the aforesaid connection and in position to contact substantially directly with the fiow of combustion products from that cylinder nearest said connection, said purifier having a major oil heating portion disposed within said exhaust manifold.

53. In combination with an automobile engine having an exhaust manifold and an exhaust pipe connection thereto, an oil purifier mounted in said manifold ahead of the aforesaid connection and in position to contact substantially directly with the flow of combustion products from one of the engine cylinders, said purifier having a major oil heating portion disposed within said exhaust manifold.

EDMUND E. HANS.