GB2075599A - Marine IC engine water pump - Google Patents
Marine IC engine water pump Download PDFInfo
- Publication number
- GB2075599A GB2075599A GB8112772A GB8112772A GB2075599A GB 2075599 A GB2075599 A GB 2075599A GB 8112772 A GB8112772 A GB 8112772A GB 8112772 A GB8112772 A GB 8112772A GB 2075599 A GB2075599 A GB 2075599A
- Authority
- GB
- United Kingdom
- Prior art keywords
- impeller
- impeller housing
- water pump
- shroud
- housing
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 69
- 239000002184 metal Substances 0.000 claims abstract description 14
- 229910052751 metal Inorganic materials 0.000 claims abstract description 14
- 230000002093 peripheral effect Effects 0.000 claims description 13
- 229910001220 stainless steel Inorganic materials 0.000 claims description 5
- 239000010935 stainless steel Substances 0.000 claims description 5
- 239000000498 cooling water Substances 0.000 claims description 4
- 238000007789 sealing Methods 0.000 claims description 3
- 238000005260 corrosion Methods 0.000 description 5
- 230000007797 corrosion Effects 0.000 description 5
- 238000001816 cooling Methods 0.000 description 3
- 238000005299 abrasion Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- 239000004033 plastic Substances 0.000 description 2
- 229920003023 plastic Polymers 0.000 description 2
- 239000004576 sand Substances 0.000 description 2
- 229910001369 Brass Inorganic materials 0.000 description 1
- 229920002430 Fibre-reinforced plastic Polymers 0.000 description 1
- 229920000459 Nitrile rubber Polymers 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 239000010951 brass Substances 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 229920001971 elastomer Polymers 0.000 description 1
- 239000011151 fibre-reinforced plastic Substances 0.000 description 1
- 239000007788 liquid Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 239000002991 molded plastic Substances 0.000 description 1
- 229910052755 nonmetal Inorganic materials 0.000 description 1
- 239000005060 rubber Substances 0.000 description 1
- 238000005482 strain hardening Methods 0.000 description 1
- 229920003051 synthetic elastomer Polymers 0.000 description 1
- 239000005061 synthetic rubber Substances 0.000 description 1
- 230000007704 transition Effects 0.000 description 1
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C2/00—Rotary-piston machines or pumps
- F04C2/30—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C2/40—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member
- F04C2/44—Rotary-piston machines or pumps having the characteristics covered by two or more groups F04C2/02, F04C2/08, F04C2/22, F04C2/24 or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C2/08 or F04C2/22 and having a hinged member with vanes hinged to the inner member
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02B—INTERNAL-COMBUSTION PISTON ENGINES; COMBUSTION ENGINES IN GENERAL
- F02B61/00—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing
- F02B61/04—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers
- F02B61/045—Adaptations of engines for driving vehicles or for driving propellers; Combinations of engines with gearing for driving propellers for marine engines
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C5/00—Rotary-piston machines or pumps with the working-chamber walls at least partly resiliently deformable
Landscapes
- Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Ocean & Marine Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
The pump (16) includes a base plate (22), a cup-shaped housing (30) and a shroud (52). An impeller (40) having flexible vanes (46) is positioned eccentrically within the housing. Water enters the housing through an inlet (28) in the base plate and is forced by the rotating impeller through an outlet (38), a passage (70) in the shroud, and a pipe (72) to the engine. The housing and shroud are formed of stamped sheet-metal parts. The impeller is attached to the engine output-shaft (14). <IMAGE>
Description
SPECIFICATION
Marine drive water pump
Technical Field
Marine drives having water cooled engines
utilize a water pump mounted over the drive shaft and internal to the drive shaft housing to
provide engine cooling.
,Background Art
One prior water pump used for cooling an
outboard engine utilized a cast metal housing.
The cast metal housing requires machining
and is costly to manufacture. Also, the life of
a cast brass or cast aluminium water pump is
relatively low where the water contains sand
and silt which will cause internal wear on the
moving parts.
Another prior water pump is formed of a
molded plastic housing. A metal liner is used
within the plastic housing to provide abrasion
resistance. Without the metal liner the plastic
will wear through resulting in a water pump
failure. A water pump failure may also result
in engine failure.
Disclosure of Invention
The present invention provides an improved
marine drive water pump that is simply and
economically formed through the use of
stamped metal parts. The parts are used with
out machining.
The improved water pump of the present
invention includes:
a base plate mounted in the marine drive,
the base plate having an eccentrically posi
tioned drive shaft opening and a water inlet
opening into the cooling water intake;
a cup-shaped impeller housing formed of
deformed sheet metal having an end wall and
a peripheral wall, the end wall having an
eccentrically positioned drive shaft opening
and a water outlet;
an impeller positioned in the impeller hous
ing for propelling water received at the water
inlet out the water outlet, the impeller having
a central portion coupled to the drive shaft
and a plurality of flexible impeller vanes ex
tending outwardly from the central portion
into contact with the peripheral wall of the
impeller housing; and
a shroud formed of deformed sheet metal
fitting over the pump housing and secured to
the base plate, the shroud forming a collect
ing chamber between the shroud and the
impeller housing connecting the water outlet
with a water discharge opening for the pump.
The improved water pump of the invention
provides a water pump which has an in
creased service life and provides a superior silt
resistance and dry running capability. The use
of a metal stamping provides work hardening
of the wear surfaces providing silt resistance
and long flexible vanes on the impeller reduces wear on the impeller housing and results in longer impeller life.
The improved water pump of the invention provides in a single water pump all of the features necessary for a marine drive. These features are abrasion resistance, dry run survivability, reduced pressure loss with time, long flex life, excellent corrosion resistance, relatively low cost and excellent long-term adhesion of impeller rubber to its non-metal insert.
In the improved water pump the long flexible vanes provide a low radial pressure thereby resulting in a reduced wear on the impeller housing, a longer flex life for the vanes, reduced pressure loss with respect to time and low friction. The low friction reduces the heat build up in the vanes and thereby permits better dry running of the water pump.
Brief Description of Drawings
Figure 1 is partially broken away side view of an outboard engine illustrating the water pump of the present invention.
Figure 2 is a cross-sectional view of the water pump shown in Fig. 1.
Figure 3 is an exploded view showing the components of the water pump shown in Fig.
1.
Figure 4 is a plan view of the impeller of the water pump shown in Fig. 1.
Figure 5 is a view from beneath showing the impeller in the impeller housing.
Best Mode for Carrying Out the Invention
The marine drive is shown as an outboard engine 10 in Fig. 1. The outboard engine 10 includes a liquid cooled power head 1 2 that powers the drive shaft 14. The engine is cooled by water supplied by a pump 1 6. The propulsion unit 1 8 of the outboard engine 10 contains a water intake 20 that is within water when the propulsion unit 1 8 is in the operating position. The water pump 1 6 also may be mounted in the outboard engine 10 so that it is below the water line when the propulsion unit 18 is submerged.
The water pump 1 6 includes a base plate 22 that is mounted in the outboard engine 10 above the water intake conduit 24 and within the gear case housing. The base plate 22 is preferably formed of stainless steel sheet. The base plate 22 has an eccentrically positioned drive shaft opening 26. The base plate 22 includes a water inlet 28 spaced from the opening 26 and communicating with the water intake conduit 24.
A cup-shaped impeller housing 30 is positioned on the base plate 22 to connect with the water inlet 28. In the preferred embodiment the impeller housing 30 is formed from a stainless steel sheet to lend economy and corrosion resistance in the manufacture of the pump 1 6 and to provide hardening of desired areas of the resulting housing. The impeller housing 30 has a peripheral wall 32. An end wall 34 of the impeller housing 30 also contains an eccentrically positioned drive shaft opening 36. The wall 34 also includes a water outlet 38 spaced from the opening 36 and about oppositely displaced as shown in the figures form the water inlet 28 after the pump 16 is assembled.
The impeller 40 is positioned in the impeller housing 30. The impeller 40 is formed of a flexible material such as synthetic rubber compounded for temperature resistance. The preferred flexible material is nitrile elastomer.
The impeller 40 includes a hub 42. The hub 42 is partly formed of fiber reinforced plastic to increase the corrosion resistance of the water pump 1 6 by avoiding a metal-to-metal contact between the impeller 40 and the drive shaft 14. The hub 42 is keyed to the drive shaft 1 4 by a key 44. A plurality of long, flexible impeller vanes 46 extend from the hub 42 of the impeller 40. In the preferred embodiment, as shown in Fig. 4, six such vanes are provided. The sealing rings 48 and 50 on either side of the hub 42 serve to seal the impeller housing 30 when the impeller 40 is located in the impeller housing 30 as shown in Fig. 2.The length and flexural properties of the vanes 46 and the outside diameter of the impeller housing 30 are selected so that a low radial pressure is exerted by each vane 46 on the peripheral wall 32 and low flexural stresses result in vanes 46. In the preferred embodiment the vane length is about 0.64 inches, the vane width at the hub 42 is about 0.2 inches and the ratio of the vane length to width is about 3.2:1. The hub outside diameter is about 1.04 inches and the inside diameter of the impeller housing 30 is about 2 inches and the ratio of the inside diameter of the impeller housing 30 to the outside diameter of the impeller hub 42 is greater than 1.9:1. The heighth of the vane is adjusted to obtain the desired capacity or volume flow of the water pump.In an alternative embodiment the vane length is about .85 inches, the vane width at the hub 42 is about 0.26 inches and the ratio of the vane length to width is about 3.3:1. The hub outside diameter is about 1.2 inches and the inside diameter of the impeller housing 30 is about 2.5 inches and the ratio of the hub outside diameter to the impeller inside diameter is about 2.1:1.
In order to obtain the best flexture life of the vanes 46 it is required that the ratio of the vane length to width is equal to or greater than 3:1 and that the ratio of the inside diameter of the impeller housing 30 to the outside diameter of the impeller hub 42 is greater than 1.9:1. Since the impeller 40 is positioned in the impeller housing 30 eccentrically with the inside diameter of the housing 30 as previously described and as shown in
Fig. 5 the outside diameter of the impeller 40 is larger than the inside diameter of the impeller housing 30. The ratio of the outside diameter of the impeller 40 to the inside diameter of the impeller housing 30 is in the range of 1.10:1 to 1.16:1. This is necessary to pro- vide sealing between the end of the vanes and the peripheral wall 32.
It is also preferred that the tip width of the vanes be a minimum. In the preferred embqdiment the tip width is about 0.12 inches and in the alternative embodiment the tip width is about 0.15 inches. The tip width is obtained by tapering the vane from its width at the hub to its extreme width at an included angle of about 8 to 9 degrees.
A shroud 52 fits over the impeller housing 30. In the preferred embodiment the shroud 52 is formed from a stainless steel sheet. The shroud 52 includes a flange 54 which con tacts the base plate 22. The shroud 52 and the base plate 22 are secured to the propulsion unit 1 8 by the bolts 56. The bolts 56 are also formed of stainless steel to reduce corrosion. Non-metallic sleeves 58 are positioned over the bolts 56 and between the flange 54 to improve corrosion resistance. The shroud 52 has a peripheral wall 60 press-fitted with the peripheral wall 32 of the impeller housing 30. An O-ring 62 at the edge of the wall 60 of the impeller housing 30 seals the base plate 22 from the impeller housing 30 and a separate gasket between the base plate 22 and the shroud 52 seals the base plate 22 from the outboard engine 10.The transition between the wall 60 and the flange 54 may be suitably formed to accomodate an O-ring 62. The shroud 52 has an end wall 64 containing an eccentric opening 66 for inserting the drive shaft 14. A rotary slinger 68 is positioned over the drive shaft 14 on top of the water pump 1 6 to prevent entry of dirt and sand. When press-fitted the end wall 60 of the impeller housing 30 and the end wall 64 of the shroud 52 form a collecting chamber in the form of a volute passage 70 that connects the water outlet 38 of the impeller housing 30 with the water discharge pipe 72 through the connector 74. A water discharge pipe 72 connects the cooling water from the water pump 1 6 to the heat producing portipns of the outboard engine 10 for cooling.
In operation the impeller housing 30 receives water through the water inlet 28 in xthe base plate 22. As shown in Fig. 5 the vanes 46 are sequentially flexed against the wall 32 of the impeller housing 30 by the eccentric rotation of the drive shaft 14 first to an increasing extent and then to a decreasing extent during each rotation of the impeller 40.
The flexing of the vanes 46 and the resulting reduction in the volume between them and the peripheral wall 32 of the impeller housing 30 forces the water in the impeller housing 30 out water outlet 38, then through the volute passage 70 and into the water discharge pipe 72.
Claims (7)
1. In a marine drive having a water cooled engine rotating a drive shaft and having a cooling water intake, the improved water pump comprising:
a) a base plate (22) mounted in said marine drive, said base plate having an eccentrically positioned drive shaft opening (26) and a water inlet opening (28) into the cooling water intake,
b) a cup-shaped impeller housing (30) formed of deformed sheet metal having an end wall (34) and a peripheral wall (32), said end wall having an eccentrically positioned drive shaft opening (36) and a water outlet (38),
c) an impeller (40) positioned in said impeller housing for propelling water received at said water inlet out said water outlet, said impeller having a central hub (48) coupled to the drive shaft and a plurality of flexible impeller vanes (46) extending outwardly from said central portion into contact with the peripheral wall of said impeller housing, and
d) a shroud (52) formed of deformed sheet metal fitting over said impeller housing and secured to said base plate, said shroud forming a collecting chamber (70) between the shroud and the impeller housing to connect said water outlet with a water discharge opening for said pump.
2. The improved water pump according to
Claim 1 including sealing means (62) between the peripheral wall of said shroud and said base plate.
3. The improved water pump according to
Claim 1 wherein said impeller housing and shroud are formed of sheet metal.
4. The improved water pump according to
Claim 3 wherein said base plate, impeller housing, and shroud are formed of stainless steel.
5. The improved water pump according to
Claim 4 wherein at least the metal of the peripheral wall of said impeller housing is work hardened during forming.
6. The improved water pump according to
Claim 1 wherein said impeller vanes are so formed as to exert low radial pressures on the peripheral wall of said impeller housing and create low flexural stresses in said impeller vanes.
7. The improved water pump according to
Claim 6 wherein the ratio of the vane length to width is greater than 3:1 and the ratio of the inside diameter of the impeller housing to the outside diameter of the impeller hub is greater than 1.9:1.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US14652880A | 1980-05-05 | 1980-05-05 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| GB2075599A true GB2075599A (en) | 1981-11-18 |
| GB2075599B GB2075599B (en) | 1984-06-27 |
Family
ID=22517796
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| GB8112772A Expired GB2075599B (en) | 1980-05-05 | 1981-04-24 | Marine ic engine water pump |
Country Status (5)
| Country | Link |
|---|---|
| JP (1) | JPS572490A (en) |
| AU (1) | AU542067B2 (en) |
| CA (1) | CA1164729A (en) |
| DE (1) | DE3117557A1 (en) |
| GB (1) | GB2075599B (en) |
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2120728A (en) * | 1982-04-29 | 1983-12-07 | Davall Moulded Gears | Rotary fluid meter or pump |
| EP0103720A1 (en) * | 1982-08-23 | 1984-03-28 | Itt Industries, Inc. | Vane-impeller arrangement for pumps |
| EP0108312A2 (en) * | 1982-10-28 | 1984-05-16 | Rolf Niemann | Device for the production of a mixture |
| DE3413647A1 (en) * | 1983-04-12 | 1984-10-18 | Barry Wright Corp., Newton Lower Falls, Mass. | PUMP IMPELLER AND METHOD FOR PRODUCING SUCH A PUMP IMPELLER |
| GB2247283A (en) * | 1990-08-23 | 1992-02-26 | Pierburg Gmbh | Rotary positive displacement pumps |
| RU2532455C1 (en) * | 2013-08-16 | 2014-11-10 | Закрытое Акционерное Общество "Новомет-Пермь" | Rotor pump |
| CN105299021A (en) * | 2014-07-09 | 2016-02-03 | 西班牙博格华纳排放系统公司 | Fixing anchor |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6261U (en) * | 1985-06-17 | 1987-01-06 | ||
| JPH01179187U (en) * | 1988-06-09 | 1989-12-22 |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US2436876A (en) * | 1943-07-29 | 1948-03-02 | Alfred L Stamsvik | Rotary sliding vane pump structure |
| US2712792A (en) * | 1950-06-28 | 1955-07-12 | Scott Atwater Mfg Co Inc | Pump structure |
| DE7909577U1 (en) * | 1979-04-03 | 1979-07-12 | Farymann - Diesel Farny & Weidmann Gmbh & Co Kg, 6840 Lampertheim | HOUSING FOR A DISPLACEMENT PUMP |
-
1981
- 1981-04-08 CA CA000374910A patent/CA1164729A/en not_active Expired
- 1981-04-24 JP JP6320481A patent/JPS572490A/en active Granted
- 1981-04-24 GB GB8112772A patent/GB2075599B/en not_active Expired
- 1981-04-30 AU AU70016/81A patent/AU542067B2/en not_active Ceased
- 1981-05-04 DE DE19813117557 patent/DE3117557A1/en active Granted
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB2120728A (en) * | 1982-04-29 | 1983-12-07 | Davall Moulded Gears | Rotary fluid meter or pump |
| EP0103720A1 (en) * | 1982-08-23 | 1984-03-28 | Itt Industries, Inc. | Vane-impeller arrangement for pumps |
| EP0108312A2 (en) * | 1982-10-28 | 1984-05-16 | Rolf Niemann | Device for the production of a mixture |
| EP0108312A3 (en) * | 1982-10-28 | 1986-11-12 | Rolf Niemann | Device for the production of a mixture |
| DE3413647A1 (en) * | 1983-04-12 | 1984-10-18 | Barry Wright Corp., Newton Lower Falls, Mass. | PUMP IMPELLER AND METHOD FOR PRODUCING SUCH A PUMP IMPELLER |
| FR2544401A1 (en) * | 1983-04-12 | 1984-10-19 | Wright Barry Corp | PUMP WHEELS AND PROCESS FOR MANUFACTURING BY CO-INJECTION MOLDING |
| GB2247283A (en) * | 1990-08-23 | 1992-02-26 | Pierburg Gmbh | Rotary positive displacement pumps |
| GB2247283B (en) * | 1990-08-23 | 1994-03-16 | Pierburg Gmbh | Vaned-cell pump or toothed-wheel pump with an internal axle |
| RU2532455C1 (en) * | 2013-08-16 | 2014-11-10 | Закрытое Акционерное Общество "Новомет-Пермь" | Rotor pump |
| CN105299021A (en) * | 2014-07-09 | 2016-02-03 | 西班牙博格华纳排放系统公司 | Fixing anchor |
Also Published As
| Publication number | Publication date |
|---|---|
| DE3117557A1 (en) | 1982-03-11 |
| GB2075599B (en) | 1984-06-27 |
| JPS6336434B2 (en) | 1988-07-20 |
| JPS572490A (en) | 1982-01-07 |
| AU542067B2 (en) | 1985-02-07 |
| DE3117557C2 (en) | 1988-01-14 |
| CA1164729A (en) | 1984-04-03 |
| AU7001681A (en) | 1981-11-12 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PCNP | Patent ceased through non-payment of renewal fee |