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Publication numberUS3431882 A
Publication typeGrant
Publication dateMar 11, 1969
Filing dateMar 26, 1967
Priority dateMar 26, 1967
Publication numberUS 3431882 A, US 3431882A, US-A-3431882, US3431882 A, US3431882A
InventorsIrgens Finn T
Original AssigneeOutboard Marine Corp
Export CitationBiBTeX, EndNote, RefMan
External Links: USPTO, USPTO Assignment, Espacenet
Marine propulsion device
US 3431882 A
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Description  (OCR text may contain errors)

March 11, 1969 F. T. IRGENS MARINE PROPULSION DEVICE Filed March 20, 1967 Sheet AT TOQN EYs March 11, 1969 F. "r. IRGENS MARINE PROPULSION DEVICE Sheet 3 of 2 Filed March 20, 1967 A Q N 2 w/ 7 3 2 W 0 W p av WIMJ MM ATTORNEY? United States Patent 9 Claims ABSTRACT OF THE DISCLOSURE Disclosed herein is a marine propulsion unit with a water jacket which surrounds an engine exhaust gas tube and which forms a portion of a recirculating engine cooling system. The lower end of the water jacket is in fluid communication with the water pump, and the upper end of the water jacket is in communication with the water jacket for the engine power head. A discharge conduit with a temperature responsive valve removes warm water from the power head to maintain uniform operating temperature of the engine. In one embodiment the discharge conduit dumps into the surrounding Water near the propeller. In another embodiment the discharge conduit dumps into the exhaust gas passage.

BACKGROUND OF THE INVENTION The present invention is a further development of the subject matter disclosed in US. Patent 3,198,162 issued to R. T. Larsen and which discloses a water jacket for an exhaust gas discharge passage in the lower unit of a marine propulsion unit.

SUMMARY OF INVENTION The invention provides a marine propulsion unit with a water jacket which surrounds the engine exhaust tube and which forms a portion of the recirculating engine cooling system with the lower end of the water jacket in fluid communication with the water pump and the upper end of the water jacket in fluid communication with the power head water jacket. The water jacket for the exhaust tube together with the resilient mounting for the exhaust tube serve to isolate the engine exhaust exitations from the sound radiating surfaces of the lower unit and accordingly provide vibration and sound isolation between the exhaust gas tube and the lower unit, thus producing a quieter operation.

With the exhaust gas tube water jacket as a part of the engine cooling system, in accordance with the invention, water is always contained in the water jacket when the engine is operating, thus affording quiet operation even when starting or when the engine is idling at a pier or the like. In addition circulation of the water warmed by the exhaust gas tube into the power head water jacket afl'ords quicker engine warm up.

Further objects and advantages of the present invention will become apparent from the following description and accompanying drawings.

3,431,882 Patented Mar. 11, 1969 DRAWINGS FIGURE 1 is a partially broken away, side elevational view, in fragmentary section, of an outboard motor embodying various of the features of the invention.

FIGURE 2 is a partially broken away, side elevational view, in fragmentary section, of a second embodiment of an outboard motor embodying various of the features of the invention.

DETAILED DESCRIPTION In the drawings, FIGURE 1 shows an outboard motor 11 which conventionally includes a transom bracket 13 to which a swivel bracket 15 is connected for vertical swinging movement about a horizontal pintle 17. The outboard motor 11 includes a power head 18 with a water jacket 19 and with an exhaust gas discharge port in the form of an exhaust gas discharge conduit 20. Also included is a lower unit 21 housing a drive shaft 22 which is connected to a water pump 23 which supplies cooling water to the power head water jacket 19.

Included in the lower unit 21 is an exhaust gas duct or passage 31 and a lower unit gear case 26 which houses a propeller shaft 27 and driving gears 28. Shaft 27 drives a propeller 29 having a hollow hub 30.

The exhaust gas passage 31 is formed in part by a generally cylindrical sleeve or tube 35. The tube 35 is resiliently supported by one or more elastomeric sleeves or mounts 37 and 39 thereby isolating the lower unit 21 from any vibration which may be imparted to the tube 35 by the exhaust gas flow. The sleeve or mount 37 is in communication with the lower end of the conduit 20 and has an annular flange 38 which extends into and seals the gap between tube 35 and conduit 20. The remaining portion of the exhaust gas passage 31 is formed by an elbow portion 44 which extends into the lower unit gear case and which is resiliently connected by an elastomeric sleeve or mount 39 to the lower end of the tube 35. The elbow 44 communicates with the interior 46 of the propeller hub 30 for discharge of engine exhaust gas into the surrounding water.

In accordance with the invention there is provided in the lower unit 21 means defining a water jacket 47 to damp transmission of vibration or sound exitations to the lower unit caused by engine exhaust gases. In the disclosed construction, such means comprises a generally cylindrical sleeve or wall 49 which co-operates with the exhaust gas tube 35 to define a fluid passage or water jacket 47. The water jacket 47 forms a portion of the recirculating engine cooling system and can be utilized either as part of the supply line from the water pump 23 to the power head water jacket 19 or as part of the return or recirculating line to the pump.

In the embodiment illustrated in FIGURE 1, the water jacket 47 forms a part of the recirculating line for re turning water from the power head water jacket 19 to the pump 23. Water is supplied to the power head water jacket by the water pump '23 which has vanes 62 secured to drive shaft 22. The vanes 62 rotate in a fixed pump housing 65. Water enters pump 23 through an inlet 66 which communicates with the water pump 23- through an inlet tube 67. Water leaving the pump 23 is carried to the power head 18 by a tube or pipe 70.

The means connecting the exhaust tube water jacket with the power head water jacket 47 comprises a port 72 through which water leaves the engine water jacket 19 and enters the exhaust gas tube water jacket 47.

The means connecting the outlet 74 of the water jacket 47 with the pump 23 for recirculation comprises a tube 75 connected to the water jacket 47 at outlet 74 and connected to the pump 23 at port 79.

Once the power head 23 is at a pre-determined operating temperature, a temperature responsive or thermostatically controlled valve 80 located in port 82 will open and permit flow of warm water through a discharge conduit or tube 84 to maintain generally constant and uniform temperature in the power head. Discharge tube 84 runs along the side of sleeve 49 and has a discharge outlet 85 near the propeller 29.

The utilization of the exhaust tube water jacket 47 as a portion of the power head cooling system, results in maintaining water in the water jacket 47 whenever the outboard motor 11 is operating, thus affording quiet operation immediately after starting of the engine and when the associated boat is docked at a pier or the like and the engine is idling. Furthermore, quicker engine warm up is alforded by exhaust gas tube heating of the recirculating water.

In the second embodiment shown in FIGURE 2, the outboard motor 111 has a water jacket 147 formed by co-operation of the exhaust gas discharge tube 135 and wall or sleeve 149. Fluid communication between the power head water jacket 171 and the exhaust tube water jacket 147 is afforded by port 172 in the power head water jacket.

Water is supplied to the pump 161 by an obliquely extending scoop 153 which is located adjacent to the propeller 129 and which has an inlet 154 communicating with a passage 155 communicating with pump 161 through a tube 178.

The pump 161 supplies water to the power head water jacket 171 through conduit or tube 170 which communicates with the exhaust tube water jacket 147 at inlet 174. The water entering the exhaust tube water jacket 147 at inlet 174 fills the exhaust tube water jacket 147 and then flows into the power head water jacket 171 through port 172. Water is returned to pump 161 from the power head water jacket 171 by a re-circulating line 173.

As in the first embodiment, to maintain uniform engine operating temperature the power head 123 is provided with a discharge conduit or pipe 184 which is controlled by a temperature responsive or thermostatically controlled valve 185 and which communicates with the power head water jacket 171. The conduit 184 extends through apertures 187 and 188 respectively in the tube 135 and the sleeve 149 for discharge of water into exhaust gas discharge passage 131.

Various of the features of the invention are set forth in the following claims.

What is claimed is:

-1. In a marine propulsion device including a power head with an exhaust gas port, a lower unit with an exhaust gas tube interiorly of said lower unit in communication with said exhaust gas port, means in said lower unit defining a water jacket surrounding said exhaust gas tube, said water jacket having an inlet and an outlet, and a recirculating cooling system including a pump with an inlet and an outlet, said inlet communicating with the body of water in which said marine propulsion device operates, and a water jacket for said power head, the improvement in combination therewith wherein said exhaust gas tube water jacket is a part of said recirculating cooling system, and means providing fluid communication between one of said inlet and said outlet of said exhaust gas tube water jacket with said water pump and the other of said inlet and said outlet of said exhaust gas tube water jacket with said power head water jacket.

2. A marine propulsion device in accordance with claim 1 wherein said means providing fluid communication between said inlet of said exhaust gas tube water jacket and said pump comprises a conduit connecting said inlet and said pump outlet.

3. In a marine propulsion device including a power head with an exhaust gas port, a lower unit with an exhaust gas tube in communication with said exhaust gas port, means in said lower unit defining a water jacket surrounding said exhaust gas tube, said water jacket having an inlet and an outlet, and a recirculating cooling system including a pump with an inlet and an outlet, and a water jacket for said power head, the improvement in combination therewith wherein said exhaust gas tube water jacket is a part of said recirculating cooling system, and means providing fluid communication between one of said inlet and said outlet of said exhaust gas tube water jacket with said water pump and the other of said inlet and said outlet of said exhaust gas tube water jacket with said power head water jacket and wherein said means providing fluid communication between the other of said inlet and said outlet of said exhaust gas tube water jacket and said power head water jacket comprises a port in said power head water jacket in communication with said exhaust tube water jacket.

4. A marine propulsion device in accordance with claim 1 wherein said means providing fluid communication between the other of said inlet and said outlet of said exhaust gas tube water jacket and said power head water jacket comprises a conduit with one end connected to the power head water jacket and the other end connected to the exhaust tube water jacket.

5. A marine propulsion device in accordance with claim 1 wherein the means providing fluid communication between one of said inlet and said outlet of said exhaust tube water jacket and said water pump comprises a conduit connecting one of said inlet and said outlet of said exhaust tube water jacket with said pump.

6. A marine propulsion device in accordance with claim 1 including a discharge conduit in communication with said power head water jacket, said discharge conduit having a temperature responsive valve.

7. A marine propulsion device in accordance with claim 6 wherein said discharge conduit communicates with said exhaust gas tube for discharge of water therethrough.

8. In a marine propulsion device including a power head with an exhaust gas port, a lower unit with an exhaust gas tube in communication with said exhaust gas port, means in said lower unit defining a water jacket surrounding said exhaust gas tube, said water jacket having an inlet and an outlet, and a recirculating cooling system including a pump with an inlet and an outlet, and a water jacket for said power head, the improvement in combination therewith wherein said exhaust gas tube water jacket is a part of said recirculating cooling system, and means providing fluid communication between one of said inlet and said outlet of said exhaust gas tube water jacket with said water pump and the other of said inlet and said outlet of said exhaust gas tube water jacket with said power head water jacket and including a scoop rearwardly of said propeller with a fluid inlet, means connecting said scoop inlet with said water pump for fluid communication therebetween, and said water jacket outlet communicates with said means connecting said scoop inlet and said water pump.

9. In a marine propulsion device including a power head with an exhaust gas port, a water jacket for said power head, said water jacket having an inlet and outlet, a lower unit with an exhaust gas tube in communication with said exhaust port, means in said lower unit defining a water jacket surrounding said exhaust gas tube, said exhaust tube water jacket having an inlet and an outlet, a drive shaft connected to a water pump, said pump communicating with a water inlet located below the surface of the water in which the marine propulsion device operates, a propeller shaft, and a propeller, the improvement in combination therewith comprising means providing fluid communication between one of said inlet and said outlet of said exhaust gas tube water jacket and said water pump, and means providing fluid communication between the other of said inlet and said outlet of said exhaust gas tube water jacket and said water pump, and means providing fluid communication between the other of said inlet and said outlet of said exhaust gas tube water jacket and said engine water jacket.

References Cited UNITED STATES PATENTS 3,319,614 5/1967 Shanahan 123-4131 X 1,234,293 7/1917 Cowles l-18 3,310,022 3/ 1967 Kollman 17 3,350,879 11/1967 Boda et a1 115-17 XR FOREIGN PATENTS 831,451 3/ 1960 Great Britain.

ANDREW H. FARRELL, Primary Examiner.

US. Cl. X.R.

UNITED STATES PATENT OFFICE CERTIFICATE OF CORRECTION Patent No. 3 ,431 ,882 March 11 1969 Finn T. Irgens It is certified that error appears in the above identified patent and that said Letters Patent are hereby corrected as shown below:

Column 5, line 9, beginning with "said water pump," cancel all to and including "water jacket and" in line 12 same column Signed and sealed this 14th day of April 1970.

(SEAL) Attest:

Edward M. Fletcher, Jr.

Commissioner of Patents Attesting Officer WILLIAM E. SCHUYLER, JR.

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Classifications
U.S. Classification440/52, 123/195.00P, 416/193.00R, 440/89.00R, 416/93.00R, 440/88.00J, 123/41.31, 440/88.00P, 440/88.00R, 440/89.00C, 60/310, 440/89.00A, 440/88.00C, 181/235
International ClassificationF02B75/20, F02B75/18, F02B61/00, F02B61/04, F02B75/00, F01P3/20
Cooperative ClassificationF02B61/045, F01P3/202, F02B75/20, F02B2075/1808
European ClassificationF01P3/20B, F02B75/20