US1256709A

US1256709A - Method of and means for cooling internal-combustion engines.

Info

Publication number: US1256709A
Application number: US19503617A
Authority: US
Inventors: Edwin H Ludeman
Original assignee: Individual
Current assignee: Individual
Priority date: 1917-10-06
Filing date: 1917-10-06
Publication date: 1918-02-19
Anticipated expiration: 1935-02-19

Description

E. II. LUDEIVIAN. METHOD 0F AND IVIEANS FOR COOLING INTERNAL COMBUSTION ENGINES.

APPLICATION FILED OQT- 6. 1917.

Patented Feb. 19,1918.

-ffff EDWIN H. LUDEMAN, 0F NEW YORK, N. Y.

METHOD 0F AND nesaaoe.

MEANS FOB COOLING INTEBNAL-COMBUSTION ENGINES.

Specication of Letters Patent. Patented Feb. i9, 191%.

Application led October 6, 1917. Serial No. 195,036.

To all whom it may concern:

Be it known that I, EDWIN H. LUDEMAN,

citizen of the United States, residing at New York, in the county of New York and State of New York, have invented certain new and useful Improvements in Methods of and Means for Cooling Internal-Combustion Engines, of which the followingI is a specification.

This invention relates to a method of and means for cooling internal combustion engines, and especially for driving the fan for cooling the water of the radiator or circulating system of a water-cooled internal combustion engine, although with certain modifications it may be applied to air-cooled engines.

In the present state of the art it is common to drive the fan by a belt from a shaft driven by the engine. This has the defect that the belts frequently break and trouble or injury results. Also, the speed of the fan has a fixed relation to the speed of the engine, which is theoretically improper, since the speed of the fan should more properly be related to the temperature of the water or engine. vention the speed of the fan :an be varied independently of the speed of the engine, and controlled by the thermal conditions prevailing in the circulating system. For example with a heavily loaded engine running at low speed, under old conditions the cooling system is frequently inadequate, because the fan runs at low speed, but by the present invention Ithe speed of the fan may be increased in proportion to the temperature.

rlhese objects are effected by driving the fan by means of a fluid motor, driven by the water circulation itself, or possibly by the oil circulation, case being produced the engine, as usual.

Means are provided for controlling the speed of the fan motor. In water cooling systems this may consist of a valve controlling the flow through the motor, and while the valve may be operated by hand it is preferably operated thermostatically, being controlled by the temperature of the circulating medium.

This method of cooling therefore provides that the speed of the fan shall be dependent upon the local temperature conditions and variable therewith to make the cooling eHect by a pump driven by By means of the present in-l the circulation in either correspond to those conditions. Hence the ltemperature of the engine may be quite cliosely regulated. In addition there is an absence of possible injury resultmgrfrom breaking of the fan belt or improper' adjustment thereof.

In the accompanying drawings- Figure 1 is a diagrammatic side elevation of an engine cooling system embodying the invention, the fan motor being parallel with the cooling jackets.

Fig. 2 is a similar view of a modification, with the motor in series with the jackets.

Fig. 3 is a similar view of a modification with an oil driven fan motor.

Referring particularly to Fig. 1, 6 indicates the cooling jackets of an internal combustion engine and 7 the radiator. At the bottom the radiator is connected by a pipe 8 to the water pump 9 which is driven by the engine and is connected by pipes 10 to the jackets, and these in turn are connected by suitable pipes 11 and 12 to the top ofthe radiator. This is the usual circulating system found in gas engines used on. automobiles or otherwise. 13 is a branch pipe or bypass connected to the system between the pump 9 and the jackets 6 and leading to a water motor 14, preferably of the rotary type, and the outlet from this motor leads through a pipe 15 to the top of the radiator. The shaft 16 of the water motor carries the fan 17 located as usual behind the radiator 7, to draw air through the same. In the top connection 12 t0 the radiator there is placed a controlling valve 1S. This is preferably a thermostatic valve of known construction which will operate automatically to increase or decrease the flow through this connection according to the temperature. That is, as the temperature of the water increases the How will decrease, and vice versa.

ln operation, some of the water forced by the water pump 9 will iow through the bypass to water motor 14 and drive the fan, and the remainder will flow' through the jackets. As the temperature of the water increases the valve 18 will reduce the roportion of water flowing through the j ac ets and will increase that flowing through the motor, thereby driving the fan at a higher rate of speed and consequently increasing the amount of air drawn through the radi- 1n the modification shown in Fig. 2 the fan motor, and increases usual water circulation remains the same, but the branch or by-pass connection 13a to the Water motor which drives the fan is tapped into the system beyond the jackets, and after passing through the motor the water fiows by the connection l5@l to the radiator. This puts the motor in series with the jackets, instead of in parallel as shown in Fig. 1. The thermostatic or other regulating valve controls the flowl through the top connection 12, and by its operation shunts more orless of the water-through the or decreases the speed of ythe fan accordingly. This construction has perhaps the advantage that all of the water passes through the jackets before it returns to the radiator.- In each.

construction, all of the water the radiator.

The advantages of a relatively constant temperature for the operation of a gas engine vhave been demonstrated, and the present invention provides a simple and efective means for maintaining this temperature. In addition to the advantages of a motor drive which requires no adjustment of belts or the like, the present invention may be so applied that in cold weather, when little cooling effect is' desired', the fan will be driven very slowly or not at all, while in hot weather high speed will be produced.

passes through For an air cooled engine, the fan motor -f may be lplaced in the oil circuit and so driven, and since it is well known that the oil'is subject to vtemperature increase, the driving circulation thereof through the motor may be controlled thermostatically, in a similar manner. The operating pump is conveniently the'same pump used as usual `for the water or oil circulation. but obvi-v ously an additional pump could be provided and driven` from some moving part of the engine. v

The invention is not limited to the particular mechanism shown, and the type of pump, motor or valve used 4may be any .suitable for the desired purposes.

The oil driven fan motor is 3, the oil pump being shown at 20, driven from the cam shaft or otherwise and connected by a pipe 21 with the motor 22 on thev fan shaft, with a return pipe 23 to the crank case or other oil reservoir, and a thermostatic control valve may be placed anywhere in the circuit, being indicated at 24.

I claim:

1. The method of cooling an internal comi bustion engine employing a circulating cooling fluid, comprising subjecting said fluid to the action of a cooling medium and producing the fiow of said cooling medium by forced circulation of said fluid.

2l The method of cooling an internal combustion engine, comprising circulating a cooling Huid about said engine, subjecting .engine to a circulation ycooling said Huid by a flow of air, producshown. in Eig.

said fluid to the action of a fluent cooling agent during its circulation, producing the flow of said cooling agent by the circulation of said uid, and controlling said owac'- cording to the temperature of said fluid.

3. The method of cooling an internal coInbustion engine, comprising subjecting said engine to the circulation. cooling said fluid by a flow of air, producing said flow of air by means driven by the circulating fluid, and controlling the flow of air according to the temperature of said Huid.

4. The method of' cooling an internal combustion engine, comprising subjecting said of cooling fluid,

ing said How by means operated by said fluid, and controlling said flow accordingv to the temperature of the fluid and independent of the speed of the engine. A

5. The combination with a cooling system for internal combustion engines employing a forced circulation of fluid, of an air fan for cooling said fluid, andmeans driven by the circulation of saidV fluid for operating the fan.

6. The combination with a cooling system for internal combustion engines employing a forced circulation of fluid, of an air fan for cooling said fluid,'means driven by the circulation of said fluid for operating'the an, and means to control the circulation to vary the speed. of the fan. n

7. The combination with a cooling system for internal combustion engines employing a forced circulation of fluid, of an air fan for cooling said fluid, and means driven by the circulation of said fluid for operating the fan, and means governed by the temperature of said fluid4 to vary the speed of the fan.

temperature of said fluid for governing said means.

10. The combination vwith an internal combustion engine,

of a cooling iuid,

for cooling said engine, and means of a pump driven by said engine for v'circulating a cooling fluid about i said engine, and a motor ing the fan.

11. The combination combustion engine, of a pump driven by said engine for-circulating a cooling fluid about said engine, an air fan for cooling said Huid, and a motor driven by an air fan for cooling said fiuid, driven by' said fluid and operatwith an internal said Huid and operatlng the fan and means to vary the operation of the motor according to the temperature of the fluid.

12. r1`he combination with an internal combustion engine, of a pump driven by said engine for circulating a cooling fluid about said engine, an air fan for cooling said fluid, and a motor driven by said fluid and operating the fan and means to vary the operation of the motor according to the temperature of the fluid and including a thermostatic valve actuated by the temperature of the fluid.

13. The combination With a fluid circulating syste'm for cooling an internal combustion engine, ofa fluid by-pass in said system, a fluid motor in said by-pass, and an air fan for cooling said fluid, said fan being connected to the motor and driven thereby.

14. rThe combination with an internal combustion engine and a fluid circulating system for cooling the same, of a fluid motor in said system, and an air fan driven by the motor, for cooling said fluid.

15. The combination With a fluid circulating system for cooling an'internal combustion engine, of a fluid by-pass in said system, a fluid motor in said by-pass, and an air fan for cooling 'said fluid, said fan being connected to the motor anddriven thereby and a thermostatic valve in said system and controlling the amount of fluid passing through said by-pass. l

16. The combination with a cooling-fluid circulating system for an internall combustion engine, including a radiator and branch pipes leading thereto, of a fluid motor in one of said branches, an air fan disposed adja- `in the other branch cent to the radiator for cooling the same and driven by the motor, and a controlling valve forlgoverning the amount of fluid acting on the motor.

17. rThe combination With the coolingfluid circulating system'for an internal combustion engine, including a radiator .and branch pipes leading thereto, `of a fluid motor in one of said branches, an air fandisposed adjacent to the radiator for cooling the same and driven by the motor, and a thermostaticall'y operated means controlling the valve in the other branch for governing the amount of fluid acting on the motor.

18. The combination With an internal combustion engine and its jacket, of a cooling fluid circulating system including said jacket, an air fan driven by said fluid for cooling the same, and means governedby the temperatureof the fluid to vary the speed of the fan and the lovv of said fluid through said jacket.

19. The combination With an internal combustion engine and its jacket, of a cooling fluid circulating jacket, an air fan for cooling the fluid, means to drive the fan, and means governed by the temperature of the fluid to vary the speed of the fan and the flow of said fluid through said jacket.

1n testimony Whereof,1 affix my signature in presence of two Witnesses.

EDWIN n. LUDEMAN.

Witnesses:

CHAs. H. TROTTER, Guo. E. TEW.

system including said n