Патент USA US2040253код для вставки
May 12, 1936. ' J. w. FITZ GERALD ‘ '1 2,040,253 - AUTOMATIC PRIMER FOR INTERNAL COMBUSTION ENQINES ’ Filed Maréh 12, 1934 “A , 2 Sheets-Sheet 1 - .L/Zvhn IKE/2575b’ May 12, 1936. 1.1. w. FITZ GERALD ' 2,040,253 AUTOMATIC PRIMER FOR INTERNAL ‘COMBUSTION ENGINES Filed March 12, 1934 2 Sheets-Sheet 2 32 Z8- Z9 ‘ > r 133 - 3O 4/ . V , I I7 a 16 3815 I5 39 ‘7/0 A 38' MIC 37 ' . i 35 36 Z0 Iéj i 4 o 22 I8 4 w ’ //G . 21/ .m J / 5'0 28 1/ 3? I9 25 2/ m //o 16 I5 29 ‘ 37* - ea 35 Z0 F r L/Z7/727 _ W E/gEPi/d . 6263922 1%: '8 , X 5* Q 2,040,253 _‘ Patented May 12, 1936 UNITED STATES PATENT OFFICE " 2,049,253, AUTOMATIC PRIMER FOR INTERNAL‘ . COMBUSTION ENGINES John w. Fitz Gerald, Milwaukee, will, 'assignor to Briggs & Stratton Corporation, Milwaukee, Wis., a corporation of Delaware - Application March 12, 1934, Serial No. 715,136 6 Claims. (01. 123-1875) ‘This invention relates to new and useful im provements in automatic primers for internal - combustion engines, and has as an object to ‘pro vide an automatic priming device ‘which is con trolled jointly by engine suction, and the thermal condition of the engine. ' ID, has an inlet ll connected to the supply line 8 by a pipe l2 and an outlet l3 connected by a pipe I‘ to the intake manifold to afford a direct , communication between the supply line and the manifold under certain conditions. As best shown in Figures-3 and 4, the inlet ll Another object of this invention is to provide ‘ leads to a transverse bore K5 in the bodyv l6 a priming device of the character described in which the admission of priming fuel to the en 10 glue is controlled by two independent-valves, one controlled jointly by engine suction and tempera ture variations, and the ‘other’ controlled solely by temperature changes. of the device with which two lateral bores I1 and t8 communicate. Intermediate the length of the body IS, the bores l1 and 18 are counter- 10 bored as at l9 and“, respectively, to de?ne abrupt shoulders forming valve seats 2| and 22, respectively. _ Adjacent the valve seats, both bores I ‘l and I8 ' 15 vide a priming device of the character described, , communicate with a cross bore 23, the opposite 15 ends of which are closed by plugs. At a medial which is simple in constructionand easily ap plied to any conventional type of internal com-5 .. point, the bore is connected with the outlet 13 A further object of this invention is to pro bustion engine. 5 e through 'a bore 24. . With the above and other objects in view which will appear as the description proceeds, my in vention resides in the novel construction, com bination and arrangement of parts substantially ‘ The several bores formed in the body provide ~ two separate fuel passages from the inlet II to 20 the outlet ‘l3. These passages are independently closed by needle valve members 25 and 26 oper ating in the bores l9 and 20 for cooperation with as hereinafter described and more particularly de?ned by the appended claims, it being-under- , 'the valve seats 2! and 22, respectively. ‘The valve member 25 is controlled entirely 25 stood that suchv changes in the precise embodi ‘ment oi the hereindisclosed invention may be thermostatically. Its outer end projects through made as come within the scope of the claims.’ a pocket 21 formed as a counterbore to the bore In the accompanying drawings, I have illus 7 l9, and ‘has a stop ?ange 28 ?xed thereto, be‘ trated one complete example of the physical em bodiment of my invention constructed according to the best mode I ‘have so far devised for the tween which and the bottom of the pocket 21, a compression spring 29 is con?ned. , The spring 30 29 yieldably urges the valve member 25 to its 7 practical application of the principles thereof,‘ open position against the opposition of the spring and in which: v Figure 1 is an elevation view showing part tension ‘of a bi-metallic U-shaped member 30 having one end anchored to the body it as at St 35 of a carburetor and the manifolds of an internal . and its other end bifurcated to engage in an an- 35' nular groove 32 in a head 33 ?xed to the extreme combustion engine, and illustrating the applica tion of this invention thereto; , Figure 2 is a side elevation view of the priming device per se; Figure 3 is a'longitudinal section view through Figure 2_on the plane of the line 3-8; Figure 4 is a section view taken through Fig ure 3 on the plane of the line 5-4; and Figure 5 is a section view similar to Figure 3, 45 but illustrating the valves in di?erent positions. Referring now more particularly to theaccom panying drawings in which like numerals indicate like parts throughout the several views, the nu meral 5 designates the carburetor of an internal 50 combustion engine supplied with fuel by a‘sup ply line 5 and conducting a combustible mixture to an intake manifold‘! through a riser 8. As is customary, an exhaust manifold 9 is located in juxtaposition to the intake manifold. _ 55 The primer, indicated generally by the numeral outer end of the stem of the valve member 25. The disposition of the metals of the thermo static member 30 is such that when the ambient temperature is cold, the valve member is per- 40 mittedto be moved to open position by its spring 29, as shown in Figure 3, but as the temperature rises, the thermostat 3B ?exes and brings its free . end in toward the body it to gradually close they valve member 25 against the action of the 45 spring 29. ’ The stem 31 of the other valve member 26' extends outwardly through a bore 35, which forms a cylinder for a piston 36 secured to the stem. The outer end of the stem 31 is slidable in a 50 hole through a plug 38, which closes the end of the cylinder bore 35. Air bleeds 38' through - the plug, permit the piston 36 to respondto suction created within the cylinder bore through ' ‘its communication with the intake manifold ‘I. 55 2. 2,040,253 To insure such communication between the cyl inder bore and the manifold, the inner end 39 admission of fuel to the engine, engine suction responsive means for closing one of said valves, of the valve stem is polygonal in cross section thermostatic means for opposing said engine suc to at all times afford communication between the cylinder bore 35 and the cross bore 23, which, as hereinbefore noted, is in constant communi cation with the intake manifold. tion responsive means and operable to hold said valve open when the ambient temperature is low and in the absence of engine suction and to hold the valve closed when the ambient temperature is high even though engine suction ceases, a spring for yieldably opening the other valve, and ther The extreme outer end of the valve stem 31 has an annular groove 40 with which the bi mostatic means opposing said spring and tend 10 strip 4| engages. The opposite end of the strip 6| ing to close said second designated valve as the . is anchored to the body "5 by securing means 42. ambient temperature rises. 2. In combination with an internal combustion The spring tension of the ‘thermostatic strip 10 furcated end of a second bi-metallic U-shaped 4| is su?ioiently light to permit engine suction .15 acting upon the piston 36 to move the valve member 26 to closed position just as soon as the ' engine becomes operative‘, but in the absence of_ engine suction, and while the ambient tempera ture is low, the thermostatic strip‘ at holds the 20 valve member 26 in open position, as shown in Figure 3. ‘ engine, an automatic priming device comprising means providing a plurality of passages con nested in parallel and adapted to'jointly supply fuel to the engine, valves in said passages for jointly controlling the admission of fuel to the engine, engine suction responsive means for clos ing one of the ‘valves, temperature actuated 20 means for opposing the suction responsive means and for holding said valve open until a predeter The operation of the device thus is as follows: Assuming that the engine is cold, and the am mined degree of ‘engine suction has been reached, bient temperature of the thermostats likewise is said temperature actuated means also holding low, the valve members 25 and 26 are conse ‘ said valve closed when a temperature of aprede 25 quently in open position as illustrated in Figure 3. termined high degree has been reached regard During the starting of the engine, the suction less of variations in engine suction, and a second built up therein is insufficient to move the valve temperature actuated means for controlling the other valve. 1 member 26 to closed position, so both valves re 30 main open to admit the maximum volume of‘ 3. In combination with an internal combustion auxiliary or priming fuel to the intake manifold. engine, an automatic primin'gI device comprising Just as soon as the enginebecomes operative. a body having two fuel passages connected in under its own power, the suction builds up to a parallel through which fuel may pass simultane-' point su?icient to move the valve member“ to ously for admission to the engine, a valve for 35 closed position against the spring tension of ' the closing each passage, a piston connected with thermostat 4|, by its- action upon the piston 36. one valve and responsive to engine suction for closing the same, a spring for holding the other The volume of priming fuel ?owing to the in valve open, and temperature actuated means for take manifold is thus materially reduced. 'I'hevalve member 25, however, does not close controlling the actuation of said valves by the 40 at this time, but remains in open position until piston and spring in accordance with the ambient .40 the temperature of the engine rises sufficiently to ?ex the thermostatic strip 30 by reason of its temperature. 3 ' ~ 4. In combination with an internal combustion engine, an automatic priming device comprising, - proximity to the exhaust manifold, toward the body of the priming device su?iciently' to over- ' a body having two fuel passages connected in come the spring 29 and ‘move the valve member parallel through which fuel may pass simultane 45 25 to closed position. ously'for admission to the engine, a valve to close , . ~ While the valve member 25 is being moved to each passage, 8. piston connected with one valve closed position by its thermostatic strip 30, the and responsive .to engine suction for closing said ' thermostatic strip 4| is also being ?exed by the ‘ valve, a spring tending to hold the other valve 50 temperature rise to force its free end in toward open, and independent bi-metallic members an chored to said body and connected at their engine is operating properly and normal oper outer free ends with the valves for controlling ating temperature has been reached, and the the actuation of the valves by said pistonv and effective suction of the engine is momentarily spring. . 55 decreased as by suddenly opening the throttle, 5. In combination with an internal combustion the valve member 26 will not be moved, being engine, an automatic-priming device, comprising held in closed position by its thermostat 40. a body having two fuel passages connected-in . Obviously, when the engine cools off, after'be parallel, a valve for closing each passage, a pis ing stopped, both‘ valve members will again‘re ton responsive to engine suction for closing one 60 sume their open positions. I ‘ , of said valves, spring means for yieldably hold so ing the other valve open, and bi-metallic U From the foregoing description taken in con nection with the accompanying drawings, it will shaped strips anchored to the body at one end ' the, body I6. 01’ the device so that if after the ' be readily apparent to those skilled in :the art to .which this invention appertains, that this in vention aii'ords a novel and extremely simple, fully automaticpriming device for internal com ‘ , bustion engines and that an exceptionally ?ne and even control of the supply of primingfuel to the engine, is had at all times. 70 A What I claim as my invention is: . ~ . 1. In combination with an internal combustion engine, an automatic priming device comprising means providing a plurality of fuel passages con nected in parallel forconducting fuel to the en 75 gine, valves in said passages for controlling the and connected at their outer free ends with the valves for controlling the response thereof to said piston and spring respectively. the bi-metallic strip opposing the action of the piston holding its valve open by its inherent resiliency when the ambient temperature is low and until engine suction exceeds a predetermined degree and hold ing its ‘valve closed regardless of variations in engine suction when the ambient temperature is high, and the bi-metallic strip of the other valve closing its valve against the action of the sp as the ambient temperature rises. ‘ 6. In combination with an internal combustion 75 2,040,258 r ' i 3 means providing two parallel fuel passages ior whereby said valve is regulated Jointly by engine suction and changes in the ambient temperature, conducting fuel from a common source to the engine, a valve in each of said passages for con means for nulliiying any ‘affect engine section might have on the other valve, and thermostatic trolling the admission of fuel to the engine there through, engine suction operated means for regu means responsive to ‘changes in the ambient tem perature acting in conjunction with said last lating one of said valves, thermostatic means re named means for regulating said other valve. engine, an automatic priming device comprising sponsive to changes in the ambient‘temperature for opposing said engine suction operated means ‘Joan w. FITZ GERALD.