US3849982A - Marine jet propulsion apparatus - Google Patents
Marine jet propulsion apparatus Download PDFInfo
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- US3849982A US3849982A US00240693A US24069372A US3849982A US 3849982 A US3849982 A US 3849982A US 00240693 A US00240693 A US 00240693A US 24069372 A US24069372 A US 24069372A US 3849982 A US3849982 A US 3849982A
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H11/00—Marine propulsion by water jets
- B63H11/02—Marine propulsion by water jets the propulsive medium being ambient water
- B63H11/04—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps
- B63H11/08—Marine propulsion by water jets the propulsive medium being ambient water by means of pumps of rotary type
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- a tubular casing having separable front and rear sections is secured at its front end to the transmission housing of a conventional outboard motor assembly.
- a bladed impeller designed for operation in a closed space is fixed on a propeller shaft which projects rearwardly from the transmission housing into the casing.
- a bearing support located within and fixed to the rear section of the casing is formed with a through opening aligned with the shaft, and seated in this opening is a bearing unit into which the rear end of the propeller shaft extends.
- the present invention affords the same basic advantages as those noted in my prior patent, viz., reducing the hazards to swimmers, water skiers, etc., in the vicinity, protecting the rotor elements from interference and damage by foreign objects, and improving the effciency and performance of the propulsion system.
- the apparatus becomes particularly suitable for effecting the conversion of certain conventional systems embodying a gas discharge duct.
- FIG. 1 is a side view partially in section
- FIG. 2 is a detail sectional view taken along line 22 of FIG. 1;
- FIG. 3 is a detail sectional view taken along line 3-3 of FIG. 1;
- FIG. 4 is a detail view of an alternative construction for the mounting of the bearing liner.
- FIG. 5 is a sectional side view showing an alternative impeller mounting arrangement.
- FIG. 1 An example of a marine propulsion system converted according to my invention is shown in FIG. 1. It includes parts of a conventional outboard motor apparatus, viz., transmission housing 2, anti-cavitation plate 4, exhaust gas outlet 6, and rearwardly projecting propeller shaft 8. Instead of the usual propeller element, however, a bladed rotary impeller 10, designed for operation within a closely fitting external shroud, is fixed to the propeller shaft by a pin 11 for rotation therewith.
- the shroud is of sectional construction, being composed of a front section 12 and a rear section 14, the front section being attached at its front end to the anticavitation plate 4 by a lug and bracket mounting 16,
- the rear shroud section 14 is releasably connected at its forward end to the rear of the front section 12 by threaded bolts, one of which is shown at 22 in FIG. 1. Also shown in this figure is a rearwardly extending external trough or channel 24 formed in the top of the rear shroud section.
- the novel bearing structure for engaging the rear end of the propeller shaft includes an outer bearing support .26 positioned within the rear shroud section and fixed thereto by struts or vanes 28. Extending through the bearing support 26 is a passageway aligned with the propeller shaft and formed with a cylindrical bore 30 at the rear and an expanded forward chamber 32.
- the bearing unit 34 seated in the bore 30 is insertable into and removable from the bearing support 26 through the open rear end of shroud section 14. It is-provided with a forwardly facing shoulder 36 which, in its working position, engages the rear end of bearing support 26.
- Releasable means 38 retains the bearing unit 34 in its working position relative to the bearing support 26.
- a removable plug 39 is provided in the wall of shroud section 14.
- the bearing unit 34 is provided with a large diameter bore 40 having an annular recess within which is seated a bearing liner 42 made of rubber or rubber-like material and having .a longitudinally grooved inner surface.
- the liner 42 may be supplied in the form of a flat strip, then rolled into cylindrical shape and inserted into the bore 40.
- the bearing liner may be mounted in the manner illustrated in FIG. 4, wherein numeral 43 designates a bronze sleeve which has been pressed into the bearing unit 34; numeral 42 designates a rubber bearing liner vulcanized inside the sleeve 43; and numeral 45 designates one of the longitudinal grooves formed in the liner.
- Extension nut 44 is fitted over the rear end of propeller shaft 8 in threaded engagement therewith. Tightening nut 44 locks the hub 46 of impeller 10 against pin 11, which engages a groove 48 formed in the impeller hub. The nut is retained in its working position by releasable means 50; it extends into the bore 40 and rotatably engages the inner surface of bearing liner 42.
- FIG. 5 of the drawings an alternative construction which is more suitable for use with certain other models.
- an extension nut 47 is threadedly connected to the rear end of the propeller shaft, but is retained by a cotter pin 51 which is independent of the impeller hub 46.
- the torque is transmitted from the propeller shaft to the impeller by splines 49, and the axial thrust is transmitted by the .pin 13.
- Lubrication and cooling of the rubber bearing liner 42 is obtained by water flowing downstream through the horizontal grooves formed in the liner. Flow of water through the bearing is assured by an axial passageway 52 which leads rearwardly from bore 40, thereby providing communication between the bearing liner 42 and the rear outlet of the shroud, and by the gap 56 between the impeller hub and the bearing support. By virtue of this arrangement a portion of the water entering the shroud is diverted through gap 56 to liner 42, through the longitudinal grooves therein, and thence through bore 40 and passageway 52 and reardwardly out of the shroud, whereby the bearing is continually lubricated. To facilitate removal of bearing unit 34, the passageway is threaded internally, as shown at 54, for engagement with an externally threaded pulling tool.
- the composite structure formed by bearing support 26 and bearing unit 34 is shaped externally in the form of a streamlined rearwardly tapered body to obtain optimum flow of fluid througn the apparatus with minimum resistance.
- the stator vanes 28 are of streamlined cross-sectional shape.
- the preferred shape is that of a cambered airfoil, or hydrofoil, oriented so as to straighten the fluid flow and neutralize the torque effect of the rotating impeller.
- bore 30 and chamber 32 are such that, with the inner bearing unit omitted, there is sufficient play to permit rear section 14 to be displaced forwardly in a tilted attitude past duct 6 and then reoriented and connected to the front section 12. At this point it is a simple matter to insert bearing unit 34 forwardly through the rear end of section 14 and into.
- Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form ofa surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear element, said support having an opening therethroudh coaxial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface co-axial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rear
- bearing unit has an outwardly extending forwardly facing shoulder at its rear end engageable with the rear end of said support, thereby limiting to a predetermined position the forward displacement of said bearing unit relative to said support.
- bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
- Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form ofa surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear element, said support having an opening therethrough coaxial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface coaxial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rearwardly from said
- bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
- Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form ofa surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear ele ment, said support having an opening therethrough coaxial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface co-axial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rear
- bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said device,
- transverse dimensions of said opening are such as to permit a certain amount of tilting of said rear element relative to said axis during assembly, whereby in assembling the deivce the front end of said rear element may be readily moved past said gas discharge duct and connected to the front element after said front element has been secured to said transmission housing and prior to insertion of said bearing unit.
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Abstract
A tubular casing having separable front and rear sections is secured at its front end to the transmission housing of a conventional outboard motor assembly. In lieu of the usual propeller element, a bladed impeller designed for operation in a closed space is fixed on a propeller shaft which projects rearwardly from the transmission housing into the casing. A bearing support located within and fixed to the rear section of the casing is formed with a through opening aligned with the shaft, and seated in this opening is a bearing unit into which the rear end of the propeller shaft extends. In order to enable installation of the rear section of the casing (following installation of the front section), it must be capable of assuming a tilted orientation before being brought into registry with the front section and while being moved forwardly past a gas discharge duct projecting from the transmission housing. Such tilting is made possible by postponing insertion of the bearing unit into the bearing support until after the rear section of the casing is in place.
Description
United States Patent 1 Hall [ Nov. 26, 1974 MARINE JET PROPULSION APPARATUS Inventor: Kimball P. Hall, Shoreham, N.Y.
Hall Marine Corporation, Shoreham, N.Y.
Filed: Apr. 3, 1972 Appl. No.: 240,693
Assignee:
References Cited UNITED STATES PATENTS Schmidt 415/142 X Primary Examiner-Clarence R. Gordon Attorney, Agent, or Firm-Emile Paul [5 7 ABSTRACT A tubular casing having separable front and rear sections is secured at its front end to the transmission housing of a conventional outboard motor assembly. In lieu of the usual propeller element, a bladed impeller designed for operation in a closed space is fixed on a propeller shaft which projects rearwardly from the transmission housing into the casing. A bearing support located within and fixed to the rear section of the casing is formed with a through opening aligned with the shaft, and seated in this opening is a bearing unit into which the rear end of the propeller shaft extends. In order to enable installation of the rear section of the casing (following installation of the front section), it must be capable of assuming a tilted orientation before being brought into registry with the front section and while being moved forwardly past a gas discharge duct projecting from the transmission housing. Such tilting is made possible by postponing insertion of the bearing unit into the bearing support until after the rear section of the casing is in place.
13 Claims, 5 Drawing Figures MARINE JET PROPULSION APPARATUS My invention is concerned with marine propulsion apparatus designed to be substituted for the propeller element of a conventional marine propulsion device, whereby the latter may be converted to a shrouded impeller or pump jet system, and represents a further development of the apparatus disclosed in my prior U.S. Pat. No. 3,389,558.
The present invention affords the same basic advantages as those noted in my prior patent, viz., reducing the hazards to swimmers, water skiers, etc., in the vicinity, protecting the rotor elements from interference and damage by foreign objects, and improving the effciency and performance of the propulsion system. In addition, by utilizing a sectional shroud construction, in conjunction with a novel design of the bearing structure supporting the rear end of the propeller shaft, the apparatus becomes particularly suitable for effecting the conversion of certain conventional systems embodying a gas discharge duct.
It is an object of the invention to utilize a bearing structure having an outer, hollow bearing support fixed within the rear section of the shroud, and an inner bearing unit insertable into and removable from the outer support through the rear end of the shroud.
It is another object to utilize a shroud having releasably connected front and rear sections and means for attaching the front section to a preexisting marine propulsion system having agas discharge duct.
It is still another object to provide passageways in and adjacent the bearing structure to enable the flow of water to and from the bearing surfaces when the apparatus is operating in its normal environment.
It is still another object to utilize an outer bearing support whose internal dimensions are adequate to permit moving the rear shroud section in a tilted attitude past the gas discharge duct during assembly of the apparatus.
These and other objects of the invention will become apparent in the light of the detailed description which follows in conjunction with the accompanying drawings, wherein:
FIG. 1 is a side view partially in section;
FIG. 2 is a detail sectional view taken along line 22 of FIG. 1;
FIG. 3 is a detail sectional view taken along line 3-3 of FIG. 1;
FIG. 4 is a detail view of an alternative construction for the mounting of the bearing liner; and
FIG. 5 is a sectional side view showing an alternative impeller mounting arrangement.
An example ofa marine propulsion system converted according to my invention is shown in FIG. 1. It includes parts of a conventional outboard motor apparatus, viz., transmission housing 2, anti-cavitation plate 4, exhaust gas outlet 6, and rearwardly projecting propeller shaft 8. Instead of the usual propeller element, however, a bladed rotary impeller 10, designed for operation within a closely fitting external shroud, is fixed to the propeller shaft by a pin 11 for rotation therewith.
The shroud is of sectional construction, being composed of a front section 12 and a rear section 14, the front section being attached at its front end to the anticavitation plate 4 by a lug and bracket mounting 16,
18, at the top, and to the transmission housing by a strap mounting 20 at the bottom.
The rear shroud section 14 is releasably connected at its forward end to the rear of the front section 12 by threaded bolts, one of which is shown at 22 in FIG. 1. Also shown in this figure is a rearwardly extending external trough or channel 24 formed in the top of the rear shroud section. When the parts of the apparatus have been assembled, the downwardly projecting gas discharge duct 6 will project into the channel 24, whereby an improved flow of the exhaust gases will be effected.
The novel bearing structure for engaging the rear end of the propeller shaft includes an outer bearing support .26 positioned within the rear shroud section and fixed thereto by struts or vanes 28. Extending through the bearing support 26 is a passageway aligned with the propeller shaft and formed with a cylindrical bore 30 at the rear and an expanded forward chamber 32. The bearing unit 34 seated in the bore 30 is insertable into and removable from the bearing support 26 through the open rear end of shroud section 14. It is-provided with a forwardly facing shoulder 36 which, in its working position, engages the rear end of bearing support 26. Releasable means 38 retains the bearing unit 34 in its working position relative to the bearing support 26. For ready access to the means 38, a removable plug 39 is provided in the wall of shroud section 14. At its forward end, the bearing unit 34 is provided with a large diameter bore 40 having an annular recess within which is seated a bearing liner 42 made of rubber or rubber-like material and having .a longitudinally grooved inner surface. The liner 42 may be supplied in the form of a flat strip, then rolled into cylindrical shape and inserted into the bore 40.
Alternatively, if desired, the bearing liner may be mounted in the manner illustrated in FIG. 4, wherein numeral 43 designates a bronze sleeve which has been pressed into the bearing unit 34; numeral 42 designates a rubber bearing liner vulcanized inside the sleeve 43; and numeral 45 designates one of the longitudinal grooves formed in the liner.
The impeller mounting just described is adapted for the conversion of a number of existing models of outboard motors; however, I have additionally shown, in FIG. 5 of the drawings an alternative construction which is more suitable for use with certain other models. In the latter construction, an extension nut 47 is threadedly connected to the rear end of the propeller shaft, but is retained by a cotter pin 51 which is independent of the impeller hub 46. The torque is transmitted from the propeller shaft to the impeller by splines 49, and the axial thrust is transmitted by the .pin 13.
Lubrication and cooling of the rubber bearing liner 42 is obtained by water flowing downstream through the horizontal grooves formed in the liner. Flow of water through the bearing is assured by an axial passageway 52 which leads rearwardly from bore 40, thereby providing communication between the bearing liner 42 and the rear outlet of the shroud, and by the gap 56 between the impeller hub and the bearing support. By virtue of this arrangement a portion of the water entering the shroud is diverted through gap 56 to liner 42, through the longitudinal grooves therein, and thence through bore 40 and passageway 52 and reardwardly out of the shroud, whereby the bearing is continually lubricated. To facilitate removal of bearing unit 34, the passageway is threaded internally, as shown at 54, for engagement with an externally threaded pulling tool.
The composite structure formed by bearing support 26 and bearing unit 34 is shaped externally in the form of a streamlined rearwardly tapered body to obtain optimum flow of fluid througn the apparatus with minimum resistance. For the same reason, the stator vanes 28 are of streamlined cross-sectional shape. The preferred shape is that of a cambered airfoil, or hydrofoil, oriented so as to straighten the fluid flow and neutralize the torque effect of the rotating impeller.
An important advantage of my novel construction is that it lends itself to easy and rapid assembly when utilized in the conversion of a-propeller-type marine propulsion system having the exhaust gas discharge duct arrangement shown in FIG. 1. If bearing parts 26, 34 were made in one piece, the step of fitting the bearing structure to the extension nut 44 would require maintaining the bearing structure in co-axial alignment with the propeller shaft while simultaneously displacing forwardly the bearing structure together with the attached shroud section. Such a step would be rendered impossible by the interference of projecting duct 6. However, with the bearing structure herein disclosed, this difficulty is overcome by postponing insertion of the bearing unit 34 until after the shroud sections have been installed. The dimensions of bore 30 and chamber 32are such that, with the inner bearing unit omitted, there is sufficient play to permit rear section 14 to be displaced forwardly in a tilted attitude past duct 6 and then reoriented and connected to the front section 12. At this point it is a simple matter to insert bearing unit 34 forwardly through the rear end of section 14 and into. bore I claim:
1. Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form ofa surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear element, said support having an opening therethroudh coaxial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface co-axial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rearwardly from said housing in alignment with said axis, the rear end of said shaft being rotatably supported in said bearing unit, a bladed impeller unit in said front element mounted on said shaft for rotation therewith, and a gas discharge duct extending downwardly and rearwardly from said housing, said rear element having an external channel in its top portion extending rearwardly and in alignment with the outlet end of said gas discharge duct.
2. The structure recited in claim 1 and wherein said bearing unit has an outwardly extending forwardly facing shoulder at its rear end engageable with the rear end of said support, thereby limiting to a predetermined position the forward displacement of said bearing unit relative to said support.
3. The structure recited in claim 2 and wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
4. The structure recited in claim 3 and wherein said support and said bearing unit in assembled condition form a fairing element having a rearwardly tapered, streamlined outer surface.
5. The structure recited in claim 4 and wherein said bearing surface is made of rubber formed with longitudinally disposed grooves.
6. The structure recited in claim 5 and wherein the transverse dimensions of said opening are such as to permit a certain amount of tilting of said rear element relative to said axis during assembly, whereby in assembling the apparatus the front end of said rear element may be readily moved past said gas discharge duct and connected to the front element after said front element has been secured to said transmission housing and prior to insertion of said bearing unit.
7. Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form ofa surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear element, said support having an opening therethrough coaxial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface coaxial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rearwardly from said housing in alignment with said axis, the rear end of said shaft being rotatably supported in said bearing unit, and a bladed impeller unit in said front element mounted on said shaft for retation therewith, wherein aid bearing unit has an outwardly extending forwardly facing shoulder at its rear end engageable with the rear end of said support, thereby limiting to a predetermined position the forward displacement of said unit relative to said support.
8. The structure recited in claim 7 and wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
9. The structure recited in claim 8 and wherein said support and said bearing unit in assembled condition form a fairing element having a rearwardly tapered,
streamlined outer surface.
10. The structure recited in claim 9 and wherein said bearing surface is made of rubber formed with longitudinally disposed grooves.
11. Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form ofa surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear ele ment, said support having an opening therethrough coaxial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface co-axial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rearwardly from said housing in alignment with said axis, the rear end of said shaft being rotatably supported in said bearing unit, and a bladed impeller unit in said front element mounted on said shaft for rotation therewith, wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said im' peller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
12. The structure recited in claim 1 and wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said device,
13. The structure recited in claim 1 and wherein the transverse dimensions of said opening are such as to permit a certain amount of tilting of said rear element relative to said axis during assembly, whereby in assembling the deivce the front end of said rear element may be readily moved past said gas discharge duct and connected to the front element after said front element has been secured to said transmission housing and prior to insertion of said bearing unit.
Claims (13)
1. Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form of a surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear element, said support having an opening therethrough co-axial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface coaxial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a powerdriven shaft extending rearwardly from said housing in alignment with said axis, the rear end of said shaft being rotatably supported in said bearing unit, a bladed impeller unit in said front element mounted on said shaft for rotation therewith, and a gas dIscharge duct extending downwardly and rearwardly from said housing, said rear element having an external channel in its top portion extending rearwardly and in alignment with the outlet end of said gas discharge duct.
2. The structure recited in claim 1 and wherein said bearing unit has an outwardly extending forwardly facing shoulder at its rear end engageable with the rear end of said support, thereby limiting to a predetermined position the forward displacement of said bearing unit relative to said support.
3. The structure recited in claim 2 and wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
4. The structure recited in claim 3 and wherein said support and said bearing unit in assembled condition form a fairing element having a rearwardly tapered, streamlined outer surface.
5. The structure recited in claim 4 and wherein said bearing surface is made of rubber formed with longitudinally disposed grooves.
6. The structure recited in claim 5 and wherein the transverse dimensions of said opening are such as to permit a certain amount of tilting of said rear element relative to said axis during assembly, whereby in assembling the apparatus the front end of said rear element may be readily moved past said gas discharge duct and connected to the front element after said front element has been secured to said transmission housing and prior to insertion of said bearing unit.
7. Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form of a surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear element, said support baving an opening therethrough co-axial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface coaxial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rearwardly from said housing in alignment with said axis, the rear end of said shaft being rotatably supported in said bearing unit, and a bladed impeller unit in said front element mounted on said shaft for retation therewith, wherein said bearing unit has an outwardly extending forwardly facing shoulder at its rear end engageable with the rear end of said support, thereby limiting to a predetermined position the forward displacement of said unit relative to said support.
8. The structure recited in claim 7 and wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
9. The structure recited in claim 8 and wherein said support and sAid bearing unit in assembled condition form a fairing element having a rearwardly tapered, streamlined outer surface.
10. The structure recited in claim 9 and wherein said bearing surface is made of rubber formed with longitudinally disposed grooves.
11. Marine propulsion apparatus comprising a front tubular element and a rear tubular element, the interior surface of said front element being in the form of a surface of revolution about a central axis, the rear end of said front element conforming in size and shape to the front end of said rear element, releasable means securing said front end of said rear element to the rear end of said front element in fixed, contiguous relation, whereby said elements constitute a single continuous tubular casing, a bearing support within said rear element, said support having an opening therethrough co-axial with said axis, means connecting said support in fixed relation to and spaced from the interior surface of said rear element, a bearing unit disposed in said opening, said bearing unit having an internal bearing surface co-axial with said axis and being insertable into and removable from said opening through the rear end of said rear element, means releasably connecting said bearing unit in fixed relation to said support, an outboard motor transmission housing, means securing the front end of said front element to said housing, a power-driven shaft extending rearwardly from said housing in alignment with said axis, the rear end of said shaft being rotatably supported in said bearing unit, and a bladed impeller unit in said front element mounted on said shaft for rotation therewith, wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said apparatus.
12. The structure recited in claim 1 and wherein said bearing unit is characterized by internal passageways providing communication between said bearing surface and the rear end of said tubular casing, and said bearing support and bearing unit are axially spaced from said impeller unit to provide communication between said bearing surface and the front end of said tubular casing, whereby a lubricating flow of water through the bearing is obtained during the normal operation of said device.
13. The structure recited in claim 1 and wherein the transverse dimensions of said opening are such as to permit a certain amount of tilting of said rear element relative to said axis during assembly, whereby in assembling the deivce the front end of said rear element may be readily moved past said gas discharge duct and connected to the front element after said front element has been secured to said transmission housing and prior to insertion of said bearing unit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00240693A US3849982A (en) | 1972-04-03 | 1972-04-03 | Marine jet propulsion apparatus |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US00240693A US3849982A (en) | 1972-04-03 | 1972-04-03 | Marine jet propulsion apparatus |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| US3849982A true US3849982A (en) | 1974-11-26 |
Family
ID=22907551
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| US00240693A Expired - Lifetime US3849982A (en) | 1972-04-03 | 1972-04-03 | Marine jet propulsion apparatus |
Country Status (1)
| Country | Link |
|---|---|
| US (1) | US3849982A (en) |
Cited By (15)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4120152A (en) * | 1977-03-15 | 1978-10-17 | Rockwell International Corporation | Anti-vortex pintle |
| US5022823A (en) * | 1989-03-06 | 1991-06-11 | Teledyne Industries, Inc. | Rotor attachment assembly |
| US5273467A (en) * | 1992-03-17 | 1993-12-28 | Hall Marine Corporation | Exhaust discharge for a pump jet |
| US5325662A (en) * | 1993-11-02 | 1994-07-05 | Hall Marine Corporation | Advanced exhaust discharge for pump jet propulsion apparatus |
| US5389020A (en) * | 1993-02-02 | 1995-02-14 | Clark; James D. | Marine prop housing |
| US5846103A (en) * | 1995-08-23 | 1998-12-08 | Outboard Marine Corporation | Tractor pump jet |
| US5964626A (en) * | 1995-08-23 | 1999-10-12 | Outboard Marine Corporation | Tractor pump jet |
| US6059618A (en) * | 1998-12-09 | 2000-05-09 | The United States Of America As Represented By The Secretary Of The Navy | Ventilated outboard motor-mounted pumpjet assembly |
| US6193569B1 (en) * | 1996-10-11 | 2001-02-27 | Richard Gwyn Davies | Water jet propulsion unit for use in water borne craft |
| US20040157512A1 (en) * | 2003-02-10 | 2004-08-12 | Applied Combustion Technology, Inc. | Pump jet with an exhaust bypass and associated methods |
| US20110053439A1 (en) * | 2009-08-27 | 2011-03-03 | Applied Combustion Technology, Inc. | Pump jet assembly and related adapter system and method |
| US20110223817A1 (en) * | 2010-03-10 | 2011-09-15 | Griffin Robert Daniel | Rudder assembly for a watercraft having a jet-drive outboard motor |
| US9517824B1 (en) * | 2011-08-31 | 2016-12-13 | Bombardier Recreational Products Inc. | Watercraft |
| DE102013001372B4 (en) * | 2013-01-28 | 2018-02-15 | Voith Patent Gmbh | Assembly method for a ship propulsion |
| US20220315175A1 (en) * | 2019-07-29 | 2022-10-06 | Oriental Recreational Products (Shanghai) Co., Ltd | Electric fin and water transport instrument |
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| US2979019A (en) * | 1958-04-30 | 1961-04-11 | Anchor Boat & Steel Co | Outboard marine drive |
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| US1747848A (en) * | 1929-03-28 | 1930-02-18 | Westinghouse Electric & Mfg Co | Pump |
| US1831835A (en) * | 1929-11-06 | 1931-11-17 | Herbert D Allee | Generator for motor boats or the like |
| US2979019A (en) * | 1958-04-30 | 1961-04-11 | Anchor Boat & Steel Co | Outboard marine drive |
| US3250069A (en) * | 1963-11-04 | 1966-05-10 | Berkeley Pump Company | Fluid take-off from turbine pump for cooling systems |
| US3271947A (en) * | 1964-05-12 | 1966-09-13 | Kemenczky Establishment | Continuous pressure jet propulsion engine |
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Cited By (17)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4120152A (en) * | 1977-03-15 | 1978-10-17 | Rockwell International Corporation | Anti-vortex pintle |
| US5022823A (en) * | 1989-03-06 | 1991-06-11 | Teledyne Industries, Inc. | Rotor attachment assembly |
| US5273467A (en) * | 1992-03-17 | 1993-12-28 | Hall Marine Corporation | Exhaust discharge for a pump jet |
| US5389020A (en) * | 1993-02-02 | 1995-02-14 | Clark; James D. | Marine prop housing |
| US5325662A (en) * | 1993-11-02 | 1994-07-05 | Hall Marine Corporation | Advanced exhaust discharge for pump jet propulsion apparatus |
| US5846103A (en) * | 1995-08-23 | 1998-12-08 | Outboard Marine Corporation | Tractor pump jet |
| US5964626A (en) * | 1995-08-23 | 1999-10-12 | Outboard Marine Corporation | Tractor pump jet |
| US6193569B1 (en) * | 1996-10-11 | 2001-02-27 | Richard Gwyn Davies | Water jet propulsion unit for use in water borne craft |
| US6059618A (en) * | 1998-12-09 | 2000-05-09 | The United States Of America As Represented By The Secretary Of The Navy | Ventilated outboard motor-mounted pumpjet assembly |
| US20040157512A1 (en) * | 2003-02-10 | 2004-08-12 | Applied Combustion Technology, Inc. | Pump jet with an exhaust bypass and associated methods |
| US6887117B2 (en) | 2003-02-10 | 2005-05-03 | Applied Combustion Technology, Inc. | Pump jet with an exhaust bypass and associated methods |
| US20110053439A1 (en) * | 2009-08-27 | 2011-03-03 | Applied Combustion Technology, Inc. | Pump jet assembly and related adapter system and method |
| US8241079B2 (en) * | 2009-08-27 | 2012-08-14 | Applied Combustion Technology, Inc. | Pump jet assembly and related adapter system and method |
| US20110223817A1 (en) * | 2010-03-10 | 2011-09-15 | Griffin Robert Daniel | Rudder assembly for a watercraft having a jet-drive outboard motor |
| US9517824B1 (en) * | 2011-08-31 | 2016-12-13 | Bombardier Recreational Products Inc. | Watercraft |
| DE102013001372B4 (en) * | 2013-01-28 | 2018-02-15 | Voith Patent Gmbh | Assembly method for a ship propulsion |
| US20220315175A1 (en) * | 2019-07-29 | 2022-10-06 | Oriental Recreational Products (Shanghai) Co., Ltd | Electric fin and water transport instrument |
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