US 2191611 A
Description (OCR text may contain errors)
F -21, 940- J.E.ESHE;AUGH Em 2,191 611 RADIATOR OVERFLLOW REGULATOR Filed Feb. 26. 195a 3nveutors es (I 5n AZ 776/50 ief ornegs I 25 operation of overflow regulators.
Patented Feb. 27, 1940 RADIATOR OVERFLOW REGULATOR Jesse E. Eshbaugh and Nelson Walker, Flint,
cln, assignors to General Motors Corporation,
Detroit, Mich, a corporation of Delaware Application February 26, 1938, Serial No. 192,778
To reduce loss of engine cooling liquid there is currently in favorthe use of overflow control valving for closing automobile engine cooling systems.- The loss ispartly of vapors especially 6 when-a low boiling 'point solution is employed and also of liquid due to overheating and surging of the system contents from the engine jacket into the present day small capacity vented inlet tank of the radiator assembly. 10 A pressure. relief valve closing the overflow vvent conserves the cooling medium and enables operation of the system underslight pressure which raises the boiling point of the liquid and increases the rate of, heat dissipation, the valve being set to relieve excess pressure and prevent bursting strains on the weaker parts of the system and leakage at the hose connections and water pump packings. To avoid subnormal pressures incident to a drop in system temperature 20 or other causes, it is desirable that provision be made to bleed air into the system for the relief of internal depression.
It is an object of the present invention to provide an improvement in the construction and The improved structure is one comprising a few simple low cost parts which can be easily applied as an accessory device to the discharge end of the usual over- 30 tying the existing system. As a commercial unit seat interposed'between the cage and fitting and 35 an integrally formed elastic skirt extending into and lining the wall of the fitting in overlapping the outwardly opening valve housed by the cage,
- On the other hand internal depression and at- 45 mospheric pressure acting on the skirt will contract or deform the elastic material and thereby break the seal for the entrance of air through the port until substantial balance is established. The arrangement and operation will be better 50 understood upon reference to the accompanying drawing wherein Figure 1 is a side elevation showing anen'gine cooling system to which the invention has been applied; Figure 2 is a fragmentary view of the closed filler spout, a por- 1 tion being shown in section as on line 2-2 of Figure 1; Figure 3 is a sectional view of the valve unit taken substantially on line 3-3 of Figure 1; Figure 4 is a detail section showing the vacuum relief valve in open position; Figure 5 is a per-- spective view illustrating a modification. 5
In the drawing the reference numeral I indicates a water cooled engine having an outlet hose connection 2 with the inlet tank 3 on the radiator core 4. The radiator outlet tank 5 has a hose connection 6 with the inlet to'the pump 1 mounted on the front iace of the cylinder block I. The pump is driven from the engine crankshaft by a belt 8 which also operates the fan 9 for drawing air through the core 4. Associated with the top tank 3 is a filler spout lllclosed by a removable cap ll carrying a sealing gasket l2.
The structure thus far described constitutes a conventional engine cooling system which also has an overflow vent pipe l3 leading from the upper region of the top tank 3 down the side of the radiator assemblyso that any discharge through the pipe will leave the system at a low point. This discharge end of the overflow pipe affords a convenient location for an accessory valve device and in the drawing the structure of the valve device is shown in detail in Figure 3. It includesm housing formed of a pair of interconnected tubular members IA and IS. The member ll afford's'a fitting to be alined with and secured to the end of the overflow pipe I3. A satisfactory connection may be had through the use of a rubber tube or coupling hose I6 fitted over the adjacent ends of the tubes l3 and I4. Intermediate its ends the tube It is 01' an enlarged diameter as at H and is provided with 38 one or more ports or openings l8. The enlarged portion l'l terminates in an annular flange or shouldered portion l9 against which bears a valve seating washer 20 of elastic deformable material such as rubber or Duprene, carrying as an in- 40 tegral extension thereof, a tapered annular wall or skirt 2| which lines the interior of the enlarged tubular wall ll in overflapping and sealing relation to the ports l8.
The washer 20 is held against the shoulder 46 Is by a flanged ring 22 against which bears an annular flange 23 on the tubular member l5,
' the parts being held in assembled relation by It thus constitutes a retainer or cage for the valve 26 and its spring 21, the bottom wall of the cage having a depression 23 to locate the remote end of the spring. The wall of the de-' pression 28 may be apertured as at 29 and additional openings 30 may be cut in the wall of the tube for discharge of ball valve 23.
In thenormal operation of the system the ball any leakage past the 26 closes the overflow and causes the system to operate under a slight pressure dependent upon the resistance of the valve seating spring 21. Satisfactory operation will be had if the spring is so selected that the ball will open at three or -four pounds internal pressure to relieve pressure I Figure 4 so that air enters through the openings l8 and passes upwardly into the overflow pipe.
"snugly in the presence of To facilitate the inward bending of the tapered end portion of the skirt the peripheral surface ofthe skirt in alignment with the openings l8 may be provided with an annular groove 3| which reduces the width of the wall at this point and allows a distribution of. the pressure throughout the circumference of the skirt.
In the modification illustrated in Figure 5 the usual overflow vent may be omitted or plugged and the filler spout 32 closed by an elastic tube 33 whose lower end is of an outside diameter to fit snugly within the interior of the spout 32. The other end of the tube 33 is pinched together by a spring member 34 of U-shape in cross section so that the system is sealed. Internal pressures will expand the flexible tube 33 in tight engagement with the filler spout and when a. prede-.- termined temperature is reached the upper end of the tube will be opjened by the spreading apart of the legs of the spring member 34. On the other hand suction internally of the system will break the seal between the spout 32 and the flexible wall 33 for passing air into the system. Po-
sitioning lugs or buttons as at 35 may be carried by the flexible wall for engagement with the upper edge of the spout 3,2 and ordinarily the frictional fit of the parts will be sufiicient to prevent accidental dislodgment of the closure. However, as a further .precaution against displacement the spout may be provided with bayonet slots ,to receive the buttons 35 and retain the removable closure in place.
1. In a closed cooling system, a valved conduit including a rigid wall portion, an elastic wall por-,
tion having one end telescopically fitted to said rigid portion and adapted to be forced away from the rigid wall portion for passing air into the conduit upon internal sub-atmospheric conditions and outwardly opening pressure relief valve means for closing the other end portion of said elastic wall portion. 7
2. In a closed cooling system, an elastic overflow conduit member, pressure relief means engaging said member, a rigid conduit member externally and telescopically 'fitted to the elastic member inwardly of said pressure relief means and against which said elastic member bears internal pressure and from which the elastic member separates under the force of external pressure for bleeding air into the system.
3. In a device of the character described, a tubular element having a shouldered portion, a valve seating washer in sealing engagement with said shoulder, a pressure relief valve seating on said washer to seal a central aperture therethrough and an elastic skirt extending from the washer into said tubular element and normally yieldingly sealing a port in the wall of the tubular element.
4. In combination, an open ended casing, a removable closure therefor, comprising a rubber tube fitted to said spout and distended by internal pressure into sealing contact therewith, said v seal being broken by external pressure acting on the tube to deform the same, and spring clamp means squeezing the end of the tube to close the same, and being adapted to yield for the relief of internal pressure.
5. A vent valve assembly-of the character described, including a housing having an intermediate shoulder and tubular portions projecting in opposite directions from the intermediate shoulder, a valve seating washer of elastic deformable material associated with said shoulder, a spring pressed outwardly opening valve seating on said washer and being enclosed in one of the tubular portions, and a skirt formed integrally with said washer and telescopically fitted to the interior wall surface of the other tubular portion to constitute an inwardly opening closure valve for a port in the wall.
6. A radiator overflow valve, including a valve seating washer having an extended skirt of elastic deformable material, a tubular member fitted to said skirt and having an opening therein normally closed by the skirt, an outwardly opening valve seated on said washer, a valve seating spring, and a tubular member enclosing said valve and seating said spring, said tubular members having cooperating outturned flanges peened one over the other and affording an annular recess to receive and locate said washer.
'7. A radiator overflow valve including a conduit terminating in a shouldered portion, a valve seating washer bearing on said shouldered portion and having a skirt of elastic deformable material extended into said conduit inclose fitting relation to the interior surface thereof for normally closing a port in the conduit wall, a retainer ring for said washer, a valve cage bearing on said ring and'secured to said shouldered portion and a spring pressed valve enclosed by the cage and seated on said washer.
'8.' In a. radiator overflow valve assembly, a conduit member, outwardly opening valve means for said member, a valve comprising a lining of elastic deformable material affording a seat at one end for said valve means and being fitted to said member-inwardly of said valve means and produit having an intake opening in the wall. thereof, a rubber bushing valve fitted into the tube over said opening and. an outwardly opening check valve seating on the end of the rubber bushing outwardly-of said intake opening.
JESSE E. ESHIBAUGH. NELSON Wm.