Патент USA US2403397код для вставки
July 2, 1946. ' 'D, R RANKIN LUBRICATION SYSTEM Filed Oct. 19, 1942 /0 37 if ' /4 8/ <62 336/ 8% 3523 22 ' 2,403,397v > 2 Sheets-Sheet l July 2, 1946. . ’ D, R, RANKlN 4 2,403,397 LUZBRICATIOIZI SYSTEM Filed Oct. 19, 1942 ‘ 757425 \ 6/ _ i .2 Sheets-Sheet 2 90 53 II Patented duty 2,. igd? curred srmras PATENT osric 2.403.391 ' LUBRICATION SYSTEM . Dan R. Rankin, Los Angeles, Calif., assignorvto Food Machinery Corporation, San Jose, Qaliii, a corporation of Delaware 1 ‘Application October 19,~1942, Serial No. 462,485 7 Claims. (01.308-93) '. V This invention relates to the lubrication art and particularly to pressure lubrication systems. It is an object of this invention to provide a novel pressure. lubricating system suitable for use on the bogie wheels of military tanks. ‘ _ .. 2 . I; Fig. 4 is a view similar toiFlg. 3 and illustrates '' the ?nal step in the assembly cf_said/cyliinder. vEig. 5 is a longitudinal view illustrating a modi ' '?ed form of the’invention.’ Such tanks operate in the presence of large 5 . Referring speci?cally to the drawings, the bogie wheel I0 is shown therein as including an axle amounts of abrasives, that is, sand and dust, M, an outer wheel structure l2, and a pair of and if amphibious must operate also frequently bearings |3 by which the outer structure I2 is in the water, and it is essential that no abrasive mounted on the axle ||. . ‘ or‘water be admitted into the bearings of these 10 Also disposed betweenthe axle ii and outer wheels. ’ ‘ structure I 2 are lubricant retaining seals I4. It is accordingly another object of my inven Axle | | comprises'a piece of'steel' shaftlng 20 tion to provide a pressure lubrication system suit provided with annular bearing shoulders 2| and able for use in bogie wheels which will completely having a bore 22 formed axially therein through~ exclude all foreign substances from admission into 15 - out its length. Opposite ends of the bore 22 have the bearing structure of the wheel. ' counterbores 23 and 26 provided with tapered While attempts have been made to accomplish - ’ threads 25 and 26 respectively. Formed radially the foregoing object by applying pressure to a in the piece of shafting 20, midway between its _ lubricant inside a wheel, the pressure thus ap ends and communicating between the bore 22 plied has varied substantially with ?uctuations in the atmospheric temperature. Unfortunately, 20 and the exterior surface of the shafting, is a the higher vtemperatures not only increase the pressure placed on the lubricant but increase the ?uidity of the lubricant so as to re's'ultin undue hole 21. ' Th'e'outer wheel structure l2 has a hub portion 30 having af'central bore 3| at opposite ends of which'are shoulders32 which lie in planes spaced I apart a slightly less- distance than the bearing Then, when relatively low temperatures are 25I shoulders 2| on the shaft 20. , The bearings |3 encountered or a rapid drop in temperature takes fit inwardly snugly against the shoulders 2| and place as when plunging into Water after travelling are held in place by sleeves 33 which are pressed over desert landfa subatmosphericipressure can .over the opposite end portions of the shaft 20 loss of the latter in very hot weather. develop within the wheel which will suck dirt or 30 against the inner races of the bearings “l3. mud into the wheel bearings. If this occurs the bogie wheel bearings wear out much earlier than The sleeves 33 have non-corrosive bushingsy36 dis they otherwise would, thus deprivingl'rour armed forces prematurely of the furtherqiuse of those posed Threaded adjacent counterbores to the bearings 31 areI3.provided - infop~ posite ends of the bore 3| and the seals M are tanks which are equipped with these bearings. 5 screwed into these counterbores so that lubricated It is a further object of my inventionto provide sealing rings 38 thereof come into snug sealing en a pressure lubricating system suitable for use in gagement with the outer surface of the bushings bogie wheels in which pressure applied to the 36. One of the seals I4 is utilized to bind the lubricant is substantially unaffected by ?uctua outer race of the adjacent bearing l3 against tions in surrounding temperatures. 40 the, adjacent shoulder 32 of the wheel hub 30; The manner of accomplishing the foregoing bearing thus takes up axial thrust shocks to objects as well as other objects and advantages . ‘ This which the wheel I ll is subjected. will be made manifest in the following description \. The space between the bearings I3, Within the taken in connection with the accompanying draw ‘borejl and outside the/axle H, constitutes a ‘mgs in which Rf" ' Fig. 1 is an elevational view of a bogie wheel with the central portion thereof in section to illus ;rate the structure and mode of operation of a Jreferred embodiment of the invention with vhich said wheel is equipped. ' - 45 lubricant ‘chamber 39. v . Mounted in the bore 22 of the axle H is a lubricant pressure element 50. This element has a base plug 5| which screws into the threads 26. This plug has a central/‘hexagonal opening 52 . Fig. 2 is a longitudinal sectional view of the 5,0 and a central threaded opening 53 which com >ressure cylinder of the invention at an inter nediate stage of its assembly. ‘Fig. 3 is a view similar to Fig. 2 showing the lext step in the assembly of said cylinder. _municates_ with a hole 54 formed transversely therein, opposite‘ ends of which open into the counterbore 24. The inner end of the plug 5| is turned down to form a cylinder head 55 which 65 ‘extends into and closes one end of a tubular 2,403,897 4. Except for thespace occupied by the grease the plunger 10 and the head 90, the space between 55in the cylinder chamber 6| is now completely evacuatedof air. That is, it is occupied by a_ brazed or cylinder 56, the lattertobeing soldered, completely close the.tend welded to the plug 5| of the cylinder 56. When the element 5|) is installedv as shown in vacuum. Fig. l, the cylinder 56 thereof extends through into the axle bore 22 and the plug 5| screwed‘ ' give this cylinder the maximum practicable plug 5| is a pressure release valve snugly-into the threads 56 as shown in Fig. 1. 7 to release lubricant fromv inside the bogle wheel |0 when pressure of this exceeds a given safety factor. It is here to be noted that the outside diameter of the cylinder 56 is less than that_of the bore 22 so that free communication is mam tained through the annular space 6|) between the. _ . The element 50 is now ready to be inserted the bore 22 as far as the counterbore 23 so as to length. Screwed into thethreaded hole 53 of the 59 adapted ' ' Before being thus inserted, a certain amount of grease is placed in the bore 22 so that when the plug 5| is in place all the space in the. bore 22 surrounding the element‘ 56 is filled with grease. _ A grease gun ‘is now applied to the Zerk ?tting 83 and grease is pumped through this ?tting into the counterbore 23 from which it passes into the cylinder chamber 6| .and compresses'the spring } hole 21, the chamber 6| within the cylinder 56, . and with the hole 56 and valve 56 in the plug 5|. pletely compressed as shown in Fig. 3. ' The force Compressed within the cylinder chamber 6| is of injecting additional grease through the ?tting 65.- ‘This is continued untilsaid spring is com a coiled expansion spring 65. The spring‘ 65 is v20 “will thus transmit an‘ excessive pressure to ‘ the safetyvalve' 59 causing grease to flow out normally much longer than the cylinder cham ber 6| and is adapted to be compressed therein wardly therethrough. The fitting 83 thus pre vents an excessive pressure being transmitted by application of a. plunger 16 tov the outer end ' After the spring and plunger have through the grease in vthe chamber 39 to the of the spring. _ thus been forced into the chamber 6|, a pm 1|. 25 grease retaining seals l4. ' When thus assembled and charged with grease, ‘ is ?xed in the mouth of this, chamber to prevent the plunger and spring from escaping. I Theplunger 16 may be of any suitable con struction but preferably includes a pair of ?exible b'ogie wheel I6 is assembled on a military tank on the frame of the tank being ' by suitable clamps cup washers v‘I2 which are trapped between . applied to the sleeved ends of the ‘axle | i. During the operation of the tank‘and the bogie wheel NJ, ?anged guide blocks 13 and a washer ‘H, all of 30 the latter will be lubricated vby grease replenished by the operation of the spring 65 until the plunger ‘HI again comes to rest against the stop pin 1|. The counterbore '23 zls closed by a plug 8|! Throughout this period there'is no'need for at screwed into the threads 25‘, this plug having a 35 'tention being given to the lubrication of this hexagonal central opening BI and a threaded hole wheel as the grease will be supplied under sub- ‘ 82 in which is screwed a Zerk check valve ?t stantially constant pressure to the bearings l3, this pressure being always in excess of the at; ting 83. Operation mospheric pressure outside ‘of the wheels H. Thus a slight leakage of grease between the ‘pack 40 ‘When the bogie wheel I6 is assembled the ing material 38 and the bushings 36 will take chamber 36 and hole 21 are ?lled with grease and place but only su?lcient to washfrom the space the plug 86 is screwed into place before the ele between these elements any slight amount of gment 50 is installed. Before explaining how this abrasive which might be thrown against this por is done'it will be necessary to describe the mode 45 tion of the wheel. ' of assembly of this element. 'Furthermore it is to be noted that extremes Prior to inserting the plunger ‘I6 intolthe cyl of temperature to which the bogie wheel might inder chamber 6|,»a quantity of grease 96 is placed ' be subjected during this period of its operation will in no wise alter the action of the spring 65 in this chamber back of the plunger. This hav ‘spring 65 is compressed in the and the amount of pressure which it places on ing been done, the to ' chamber 6|, the plunger 10 inserted and the pin the lubricant‘ within the whee1 will at all times 1| secured in place to trap the spring and plunger be substantially the same. This is because the spring 65 is completely sealed from the outside as shown in Fig. 2. vThe unit 50 may then remain as thus shown pressure and is surrounded by a vacuum. until the time comes to install it in the bogie The lubricant in the chamber 6| is of course 55 wheel It.’ At that time the unit 50 may be cooked replenished at intervals by recharging the wheel by the use of a rod 9| as shown in Fig. 3. This through ?tting 83 in accordance with universally rod‘ is extended into the chamber 6| past the stop followed automotive lubricating practice. These pin 1| into engagement with the plunger 10 so .intervals are ?xed so that each wheel I0 is re as to force this plunger toward the cylinder head charged with grease before the plunger 16 comes 55 at the closed end of the cylinder until the 60 in contact with the stop pin 1|. Thus grease which are held in assembled relation by a screw 15. . ‘ -_ g ‘ spring 65 is completely collapsed with itsadja centcoils in contact with each other. The quan . is always fed to the bearings l3‘ under pressure from the spring 65. tity of grease 90 disposed in the chamber 6| is sufficient so that before'the spring 65' has been . ‘It is to be noted that if grease should leak ‘around. the plunger ‘I6 so that the element 50 will thus collapsed all the space between‘the plunger 65 not receive its maximum charge of grease, the 10 and ‘the cylinder head 55 is ?lled with this plunger ‘Ill can be reset by removing the plug grease so that a'quantity 92 of this grease over flows past the cup‘ washers 13 of “the plunger 10. When the spring 65 has ‘thus been entirely ‘60 and applying a rod to plunger 10 as shown - inFig.3. In Fig. 5 I have illustrated an alternative form of the invention in which a core 95 is provided in the closed end of a cylinder 96 which may be substituted for the cylinder 56 of the element .56. rod 9| permitting the spring 65 to expand and The function of the core 95 is to occupy most return the plunger 10 back to the position in the space within the spring 65 when this is shown-in Fig. 15 of which it engages the stop pin 1| as collapsed so as to comprise a stop preventing further movement of the plunger ‘Ill towards the cylinder head '55, the pressure is relaxed on the 2,403,397 5 compressed as shown in Fig. 3, thereby obviating the necessity of a relatively large- quantity of grease 90 in the chamber 6| between the plunger 10 and the closed end of the cylinder. What I claim is: __ . 1. In a lubrication system for supplying lubri_ cant to a lubricant chamber, the combination of: closed end, the open end of said cylinder being adapted to communicate with‘ said chamber; a cup plunger disposed in said cylinder and adapted when lubricated to make an airtight ?t therewith; an expansion spring in said cylinder between the closed end thereof and said plunger, said spring having su?’icient expansive strength means forming a cylinder having an air-tight when- compressed to expand and force said > closed end, the open end oi’ said cylinder being toward the open end of said cylinder adapted to communicatejwith' said chamber; a 10 plunger against the pressure of the atmosphere; and a cup plunger disposed in said cylinder and adapted quantityof grease disposed within said cylinder when lubricated to make an airtight ?t there a to substantially ?ll the space located within the with; and an expansion spring in said cylinder coils of said spring and between said plunger between the closed end thereof and said plunger, and the closed end of said cylinder when said said spring having su?lcient expansive strength 16 spring is fully compressed when compressed to expand and force said plunger toward the open end of said cylinder against the pressureof the atmcxsphere. 2. In a lubrication system for supplying lubri cant to a lubricant chamber, the combination of: 20 means forming a cylinder having an air-tight closed end, the open end of said cylinder being adapted to communicate with said chamber; a cup plunger disposed in said cylinder and adapted , when lubricated to make an airtight ?t there with; an expansion spring in said cylinder be .tween the closed end thereof and said plunger, said spring having su?icient expansive strength 5. In combination: an axle adapted to rotat ably support a wheel, said axle having an axial bore extending therethrough to form a lubricant chamber, and passage means to conduct lub'ricant from said chamber to a wheel carried by said axle; closures provided for opposite ends of said bore; a tube provided on one of said closures and ?tting loosely in said chamber; a plunger in said tube; a spring in ‘said tube between said 25 plunger and the closure to which said tube is ' attached; a check .valve; and an escape valve, one of said valves being provided upon each of said closures, there being passage means provided when compressed to expand and force said placing each of said valves in communication plunger toward the open end 01' said ‘cylinder against the pressure 01' the atmosphere ; and stop 30 310th the space outside said tube and within said means at the open end of said cylinder to re tain said plunger therein against the expansive force of said spring. . _6. In combination: an axle adapted to rotat ably support a wheel, there being a bore extend 3. In a lubrication system for supplying -1ubri.. 35 ing axially through said axle to form a lubricant chamber, there being passage means provided in cant to a lubricant chamber, the combination of: said axle to conduct lubricant from said cham means forming a cylinder having an air-tight ber to a wheel carried bysaid axle, the opposite closed end, the open end 01' said cylinder being ends of said bore being internally threaded; adapted to communicate with said chamber; a screw plugs adapted to be received by said cup plunger disposed in said cylinder and threaded bore ends; a tube. provided on one of adaptedwhen lubricated to make an airtight ?t said plugs and adapted to be extended into said therewith: an expansion spring in said cylinder chamber when said plug is inserted in one end of between the closed end thereof and said plunger, said bore; a plunger in said tube; a spring in said spring having sumcient expansive strength said. tube between said plunger and the plug on when compressed to expand and force said which said tube is mounted; an intake check plunger toward the open end- of said cylinder valve; ‘and a pressure relief valve, one of said against the pressure of the atmosphere; and a valves being mounted in each of said cups to com ‘core oi’ incompressible material disposed within municate with space within said bore about said said cylinder to substantially fill the space located tube. within the coils oi.’ said spring and between said 60 7. A combination as in claim 5 in which said plunger and the closed end 0! said cylinder when closure on which said tube is mounted com said spring is fully compressed. ’ ' pletely closes the end oi'said tube which is secured 4. In a lubrication system for supplying lubri thereto thereby forming an air tight space be cant to a lubricant chamber, the combination 01': tween said closure and the plunger in said tube. means forming a cylinder having an ‘air-tight DAN R. RANKIN’.