US1903412A - Internal combustion engine - Google Patents

Description

April 4, w33- ll.. M. wooLsoN 1,903,4l2

INTERNAL COMBUSTON ENGINE 2 Sheets-Sheet 1 Filed Oct. 25, 1930 mmm/AW.

I fl/f A Z9 A a d? l EMMA? NooLso/v.

PY4, 1933- l.. M. wooLsoN lLQOLMZ INTERNAL COMBUSTION ENG/INE FiledOct. 25, i350 2 Sheets-Sheet 2 Patented Apr. 4, 1933 UNTE STATES maar FATNT @FFE LIONEL M. WOOLSON, DECEASED, LATE 0F DETROIT, MICHIGAN, BY EMMA F. WOOLSON, EXECUTRIX, OF BLOOMFIELD VILLAGE, MICHIGAN, ASSIGNOR TO PACKARD MOTOR CAR COMPANY, OF DETROIT, MICHIGAN, A CORPORATION OF MICHIGAN INTERNAL COMBUSTION ENGINE Application led October 25, 1930. .Serial No. 491,255.

This invention relates to internal combustion engines and more particularly to pumping mechanism for engine lubricating systems.

An object of the invention is to provide a novel and improved form of pumping mechanism for internal combustion engines.

Another object of the invention is to provide pumping mechanism for a lubricating system of an internal combustion engine in which there is a circulating pump for moving lubricant through the engine and two suction pumps for moving lubricant to a reservoir through a cooler.

A further object of the invention is to provide a unitary pump organization for the lubricating system of an internal combustion engine which consists of a plurality of pumps driven from ay common shaft and having chambers connected in a novel manner.

These and other objects of the invention will appear from the following description taken in connection with the drawings, which form a part of this specification, and in which:

Fig. 1 is an end view of the pump assembl 5Fig. 2 is a sectional view of the same taken on line 2-2 of Fig. 1;

Fig. 3 is a sectional view taken on line 3 3 of Fig. 2, showing the suction pump;

Fig. 4 is a sectional view taken on line 4 4 of Fig. 2, showing the shunting pump;

Fig. 5 is a sectional view taken on line 5-5 of Fig. 2, showing the pressure pump;

Fig. 6 is a fragmentary sectional view` of the pump mechanism taken on line 6-6 of Fig. 3;

Fig. 7 is a sectional view taken on line 7 -7 of Fig. 1;

Fig. 8 is a diagrammatic view of the lubricating system associated with an engine.-

This invention has todo with the pump mechanism per se which is associated in a system of the character set forth an:1 covered in his co-pending application Serial No. 441,390,

c ludes a lubricant reservoir 11, a cooler 12 and Ua pump mechanism indicated generally at 13. There is a'pressure pump mechanism 14 for moving lubricant from l the reservoir into suitable ducts formed in the engine (not shown) and leading to points to be lubricated; there is a suction pump indicated generally at 15 for movingcollected excess lubricant from the engine through the cooler to the reservoir, and a seccircuit so that when it becomes overloaded eX- cess lubricant will pass directly to the return line leading to the cooler and reservoir. The suction pump 16 and its connection 18 lead directly to the return line and are provided so that lubricant can be moved directly into the reservoir from the return line and the cooler for the purpose of reducing the temperature of the lubricant in the return line and maintaining the return line completely filled with lubricant so that a maximum heat transfer will take place through a full Volume capacity flow in the cooler.

In order to move lubricant in a system in the manner above described, there is provided a novel and improved pumping mechanism which consists generally of a plurality of sections associated to provide an eficient compact structure which can be readily associated with the engine casing and driven from the interior thereof. The end wall 20 of a casing 21 abuts against the rear cover 22 of the engine and is closed by a partition Wall 23 to form a chamber for the suction mechanism which moves lubricant from theengine lto the cooler and reservoir. Another casing 24 is arranged in alignment with an intermediate casing 25 and a partition 26 divides such chamber casing is provided with an open en casings while an open end of the casing abuts against the partition 23. The casing 24 provides a feeding chamber while the casmg 25 provides a chamber for the vauxiliary umpmechanism. It will beseen that the t chambers are arranged in ali ent and a plurality of bolts 27 extend t rough the casings and engage the end wall of the engine to secure the composite pump housing structure thereto.

The casing 21 is provided with'a guide flange 28 which extends into an opening in the engineend wall and pilots the structure relative thereto. A shaft 29 extends axially through the pump casing structure from the interior of the crank case and is rovided on its interior end with a gear 30 a' apted to be driven from the crank shaft in any conventional manner. A shaft 31 extends through the pum casing structure in a parallelrelationwi the driven shaft 29 and gears 32, 33 and 34 are loosely mounted upon such shaft. The gear 32 is arranged within the suction return chamber, the gear 33 is in the auxiliary shuntin chamber, while the gear 34 is in the pressure ceding chamber. Keyedto the shaft 29 are gears 35, 36 and 37, the gear 35 being in the suction return chamber and meshing with the gear' 32, the gear 36 being in the auxiliary shunting chamber and meshing with ear 33 while the gear 37 is in thepressure ceding chamber and meshes with the gear 34. It will thus be seen that within each of the three casings there is al pair of meshing gears which form a pump structure for circulating the lubricant therethrough.

The outer tend of the pressure feedin axial extension 38, the end of which is closed b a cap 39 which is fastened by a nut 40 w ich is screwed upon a stud 41 fixed to the pressure casing 24. The ca 39 has a c 1indrical screen 42 fixed to the inner face t ereof and such screen is of substantially the same diameter as the chamber formed by the extension 39. A conduit 43 is screwed into an o ning 44 in the -end wall of the casing 24 w ich ortion thereof projects from the cylindricafextension and serves as `an inlet rfor lubricant entering the pumpstructure from the reservoir 11. Lubricant entering the pressure feeding chamber from the conduit 43 must pass t rough the screen 42 and an opening indicated at 45 in the interior wall 46 of the casing 24. The gears 37 and 34 draw lubricant from the reservoir through v the conduit 43 into the pressure feeding chamber within the'casing 24 and 'move it under pressure through an outlet 47 in the partition wall 26, through an aperture 48 in the casing 25 and an aperture 49 in the suction casing which leads to an outlet duct 50 with which a conduit 51 is secured. Itwill be understood that the o enings 47, 48 and 05 49 are in alignment an that there is an f aligned opening in the partition 23 so that an enclosed passage-way is thus formed to extend from the pressure chamber to the outlet chamber 50 in the suction return casing, and that lubricant will be forced through such passage-way and the conduit 51 to a suitable conduit system interiorly of the engine and leading to points to be lubricated therein.

The partition 26 is also formed with an aperture 52 which leads into the chamber .formed by the casing 25 so that the pair of gears therein will draw a portion of the oil entering the pressure chamber into the auxiliary shunting chamber from which it is moved under pressure to the return line 53 through the opening 54 in the partition 23 which leads into' the outlet end 55 of the suction return chamber, the return line 53 being secured in the -opening 54 formed in the wall of the casing 21.

The pair of gears 32 and 35 are arranged within the suction return chamber and draw excess lubricant which is collected in the envthe reservoir through the shunting chamber and that returnin from the engine passes into the return con uit and is forced through the cooler and the conduit 58 back into the reservoir 11. In order to accommodate the quantity of lubricant which is moved through both the suction return and shunting chambers, the conduit 53 is formed of adequate cross-Sectional diameter. It will also be seen that lubricant isshunted through the presthere is a valve 60 which is slidably mounted in an o enin 61 formed in the casing 25 and norma y he d in closed `position by a coil spring 62, the tension of which vis regulated by the cap 63 which is screwed into the casing openin 61 and can be adjusted axially as may be e'sired. It will be seen that the valve normally maintains thel passage 59 closed but when a predetermined pressure is present in the conduit leading from the pressure chamber to the\engine, then such pressure will force the valve opemagainst the tension of the spring 62 so that it Will'flow into the outlet portion of the suction return chamber and thus relieve the pressure in the feed line the desired amount.

Through the organization of the three pumps herein described. there is provided a unitary compact structure which can be readily associated With or removed from the rear cover of the engine casing. It will also be seen that the composite pump structure herein described provides for interior connections so that the use of tubing and connections is not required, thus the possibility of external leakage is materially minimized.

lVhile there is herein described in some detail a specific embodiment of the invention, which is deemed to be new and advantageous and may be specifically claimed, it is not desired to have it understood that the invention is limited to the eXact details of the construction, as it will .be apparent that changes may be made therein Without departing from the spirit or scope of the invention.

What is claimed is:

1. In a lubricating system for engines, a pump structure comprising three aligned casings providing chambers, a pair of parallel shafts extending through the chambers, one of said shafts-being driven, a pair of meshing pump gears in each chamber mounted on the shafts, the gear on the driven shaft being fixed thereto, conduit means connecting the feeding chambers With the engine lubricating ducts and with a source of lubricant supply, conduit means connecting the outlet chamber With the outlet end of the engine lubrieating duct means and the source of lubricant supply, and means connecting the third 1cthamber with the feeding and outlet chamers.

2. In a lubricating system for engines, a pump structure comprising a casing forming a feeding chamber, an outlet chamber and shunt chamber, a pair of pump gears in each,

chamber, means for driving a gearof each pair of gears when the engine is operating, and duct means connecting the shunt chamber With the inlet portion ofthe feeding vchamber and the outlet portion of the outlet chamber.

3. In a lubricating system for engines, a pump structure comprising feeding pump means for moving lubricant from a reservoir to the engine parts to be lubricated, suction pump means for returning lubricant from the engine to the reservoir, and pump means for means to the suction pump means. 4. In a lubricating system for engines, a

pump structure comprising a casing divided let chambers, and pump means in each of the chambers.

5. In a lubricating system for engines, a pump structure comprising a casing divided to provide an inlet chamber, a' feeding chamber and an outlet chamber, pump gears in the chambers, relief duct means vconnecting the discharge side of the inlet chamber with the discharge side of the outlet chamber, and a pressure actuated valve in the relief duct.

6. In a lubricating system for engines, a pump structure comprising a section casing providing a feeding chamber and an outlet chamber, pump gears in the chambers, a feeding duct extending through the casing from the feeding chamber, a connecting duct leading from the feeding duct to the outlet portion of-the outlet chamber, and a pressure relief valve in the connecting duct opened by .pump structure comprising a casing divided to provide a feeding chamber and an outlet chamber, pump means in the chambers, and duct means in the casing connecting the inlet side of the feeding chamber with the discharge side of the outlet chamber.

8. In a lubricating system for engines, a pumpl structure comprising a casing divided to provide a feeding chamber and an outlet chamber, pump means in the chambers, duct means in the casing connecting the inlet side of the feeding chamber with the discharge side of the outlet chamber, and pump means in the duct means.

.In testimony whereof, have hereunto subscribed my narfle this'24th day of October,

'Emea/whim of the Estate of Lionel M. Woolson, Deceased.

Vshunting lubricant from the feeding` pump

Images