CA1247388A - Water pump for marine propulsion devices - Google Patents
Water pump for marine propulsion devicesInfo
- Publication number
- CA1247388A CA1247388A CA000477605A CA477605A CA1247388A CA 1247388 A CA1247388 A CA 1247388A CA 000477605 A CA000477605 A CA 000477605A CA 477605 A CA477605 A CA 477605A CA 1247388 A CA1247388 A CA 1247388A
- Authority
- CA
- Canada
- Prior art keywords
- arcuate surface
- drive shaft
- bore
- keyway
- flat side
- 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.)
- Expired
Links
Classifications
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16D—COUPLINGS FOR TRANSMITTING ROTATION; CLUTCHES; BRAKES
- F16D1/00—Couplings for rigidly connecting two coaxial shafts or other movable machine elements
- F16D1/06—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end
- F16D1/08—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key
- F16D1/0876—Couplings for rigidly connecting two coaxial shafts or other movable machine elements for attachment of a member on a shaft or on a shaft-end with clamping hub; with hub and longitudinal key with axial keys and no other radial clamping
Landscapes
- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
Abstract
ABSTRACT OF THE INVENTION
A fluid pump assembly comprising a circular drive shaft including a flat side, and an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and having opposite ends, one of the ends being blunt, and an arcuate surface extending between the ends. The assembly also comprises a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, and a blunt end complementary with the blunt end of the keyway.
A fluid pump assembly comprising a circular drive shaft including a flat side, and an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and having opposite ends, one of the ends being blunt, and an arcuate surface extending between the ends. The assembly also comprises a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, and a blunt end complementary with the blunt end of the keyway.
Description
~ATER PU~P FOR ~ARINE PROPULSION DEVICES
BACKGROUND OF THE INVENTION
This invention relates to watec pump~
for marine propulsion davices and, more particularly, to rhe impeller-drive shafr assembly of such a water pump.
~ ater pumps in marine propulsion devices typically have cubber vaned impellers that are eccentrically located in the pump chamber. Such an impeller is inherently unevenly loaded, and ~his causes a wearing action between the impeller hub and the drive shaft with each rota~ion.
Typical means for the driving of the impeller hub by the drive shaft are, for example, bonding, set screws, through bolts, press f i~&, and interference fit keys. These means often result in cocrosion problems and difficulty in installation or removal. Furthermore, with extended operation, the wearing action between these drive mechanisms and the impeller hub can cause damage ~o ei~her member and can ultimately result in failure of the water pump.
This is especially true when the water pump is operated in an abrasive environment.
Attention is directed to the following U.S. patents which disclose pump impeller-shaft assemblies.
Patentee Patent No Issued Shortt 150,261 April 28, 1874 Gilbert 368,468 Auqust 16, 1887 Gray et al. 550,019 November 19, 1895 Bacbour 599,824 March 1, 1898 f~
BACKGROUND OF THE INVENTION
This invention relates to watec pump~
for marine propulsion davices and, more particularly, to rhe impeller-drive shafr assembly of such a water pump.
~ ater pumps in marine propulsion devices typically have cubber vaned impellers that are eccentrically located in the pump chamber. Such an impeller is inherently unevenly loaded, and ~his causes a wearing action between the impeller hub and the drive shaft with each rota~ion.
Typical means for the driving of the impeller hub by the drive shaft are, for example, bonding, set screws, through bolts, press f i~&, and interference fit keys. These means often result in cocrosion problems and difficulty in installation or removal. Furthermore, with extended operation, the wearing action between these drive mechanisms and the impeller hub can cause damage ~o ei~her member and can ultimately result in failure of the water pump.
This is especially true when the water pump is operated in an abrasive environment.
Attention is directed to the following U.S. patents which disclose pump impeller-shaft assemblies.
Patentee Patent No Issued Shortt 150,261 April 28, 1874 Gilbert 368,468 Auqust 16, 1887 Gray et al. 550,019 November 19, 1895 Bacbour 599,824 March 1, 1898 f~
- 2 - 7363-665 Davis 634,660 October 10, 1899 Hawksworth641,106 January 9, 1900 Boss 687,393 November 26, 1901 Veitch, Jr.2,883,838 ~pril 28, 1959 Steiner3,438,660 April 15, 1969 Swiderski et al. 3,994,608 November 30, 1976 Schonwald et al. 4.172,678 October 30, 1973 Attentlon is also directed to co-pending Canadian application Serial No. 461,176 filed on August 16, 1984, and entitled "Water Pump For Marine Propulsion Devices."
SUMMARY OF T~E INVBNTION
The invention provides a fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent~shaped keyway adjoining the bore and having opposite endsO
one of the ends being blunt, and an arcuate surface extending between the ends. The assembly also comprises a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, and a blunt end complementary with the blunt end of the keyway.
In one embodiment, the circular bore in the impeller has a radius, and the arcuate surface of the keyway has a constant radius that is greater than the radius of the circular bore.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, and an impeller hub including a circular bore having a radius and forming a part of an inner surface of the impeller hub, the circular bore receiving the drive shaft, and a generally crescent~shaped keyway adjoining the bore and forming a part of the inner surface of the impeller hub. The keyway has opposite ends, one of the ends being blunt, and an arcuate surface extending between the ends and having a constant ra~ius that is greater than the radius of the circular bore. The assembly also comprises a generally crescent-shaped retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, and a blunt end complementary with the blunt end of the keyway.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, means for rotating said drive shaf~, and an impeller hub including a circular bore receiving the drive shaft and forming a par~ of an inner surface of the impeller hub, and a keyway adjoining the bore and forming a part of the inner surface of the impeller hub. The keyway is generally crescent-shaped and has opposite ends, one of the opposite ends being blunt, and an arcuate surface extending between the ends. The assembly also comprises a generally crescent-shaped retainer key having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, a blunt end complementary with the blunt end of the keyway, and a pointed end opposite the blunt end.
The retainer key is positioned in the keyway such that, when the drive shaft is rotated in the direction from the blunt end of the keyway toward the opposite end of the keyway, the pointed end of the retainer key is wedged between the drive shafc and the impeller hub to lock the drive shaft and the impeller hub in a single driving relation to each other.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and defined in part by an arcuate surface and a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, and an arcuate surface complemen~ary with the arcuate surface of the keyway.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and having a pointed end pointing in the direction of intended rotation, and an arcuate surface extending from the pointed end, and a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, ~2~
and a pointed end complementary with the pointed end of the keyway.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface includiny a fiest portion having a constant radius and a second portion which extends from the first portion and has a radius greater than the constant radius, a circular drive shaft extending into the bore and including a flat side, and a retainer key positioned in the bore and having a flat surface complementary with the flat side of the drive shaft, and an arcuate surface complementary with the second portion of the inner arcuate surface of the hub.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends from the first portion and has a radius greater than the constant radius, a circular drive shaft extending into the bore and including a flat side, and a retainer key positioned in the bore and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the second portion of the inner arcuate surface of the hub, and a pointed end pointing in the direction of intended rotation.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft, and by a generally crescent-shaped keyway adjoining the bore and defined in part by an arcuate surface extending from immediately adjacent the flat side end, and a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft and extending from immediately adjacent the flat side end, and an arcuate surEace complementary with the arcuate surEace of the keyway and extending from immediately adjacent the flat side end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and including a pointed end located immediately adjacent the flat side end and pointing in the direction of intended rotation, and an arcuate surface extending from the keyway pointed end, and a retainer key positioned in the keyway and including a pointed end located immediately adjacent the flat side end and being complementary with the pointed end of the keyway, a flat surface extending from the pointed end of the retainer key and being complementary with the flat side of the drive shaft, and an arcuate surface extending from the pointed end of the retainer key and being complementary with the arcuate surface of the keyway.
The invention also provides a fluid pump assembly comprising impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends from the end of the first port.ion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located
SUMMARY OF T~E INVBNTION
The invention provides a fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent~shaped keyway adjoining the bore and having opposite endsO
one of the ends being blunt, and an arcuate surface extending between the ends. The assembly also comprises a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, and a blunt end complementary with the blunt end of the keyway.
In one embodiment, the circular bore in the impeller has a radius, and the arcuate surface of the keyway has a constant radius that is greater than the radius of the circular bore.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, and an impeller hub including a circular bore having a radius and forming a part of an inner surface of the impeller hub, the circular bore receiving the drive shaft, and a generally crescent~shaped keyway adjoining the bore and forming a part of the inner surface of the impeller hub. The keyway has opposite ends, one of the ends being blunt, and an arcuate surface extending between the ends and having a constant ra~ius that is greater than the radius of the circular bore. The assembly also comprises a generally crescent-shaped retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, and a blunt end complementary with the blunt end of the keyway.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, means for rotating said drive shaf~, and an impeller hub including a circular bore receiving the drive shaft and forming a par~ of an inner surface of the impeller hub, and a keyway adjoining the bore and forming a part of the inner surface of the impeller hub. The keyway is generally crescent-shaped and has opposite ends, one of the opposite ends being blunt, and an arcuate surface extending between the ends. The assembly also comprises a generally crescent-shaped retainer key having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, a blunt end complementary with the blunt end of the keyway, and a pointed end opposite the blunt end.
The retainer key is positioned in the keyway such that, when the drive shaft is rotated in the direction from the blunt end of the keyway toward the opposite end of the keyway, the pointed end of the retainer key is wedged between the drive shafc and the impeller hub to lock the drive shaft and the impeller hub in a single driving relation to each other.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and defined in part by an arcuate surface and a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, and an arcuate surface complemen~ary with the arcuate surface of the keyway.
The invention also provides a fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and having a pointed end pointing in the direction of intended rotation, and an arcuate surface extending from the pointed end, and a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the arcuate surface of the keyway, ~2~
and a pointed end complementary with the pointed end of the keyway.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface includiny a fiest portion having a constant radius and a second portion which extends from the first portion and has a radius greater than the constant radius, a circular drive shaft extending into the bore and including a flat side, and a retainer key positioned in the bore and having a flat surface complementary with the flat side of the drive shaft, and an arcuate surface complementary with the second portion of the inner arcuate surface of the hub.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends from the first portion and has a radius greater than the constant radius, a circular drive shaft extending into the bore and including a flat side, and a retainer key positioned in the bore and having a flat surface complementary with the flat side of the drive shaft, an arcuate surface complementary with the second portion of the inner arcuate surface of the hub, and a pointed end pointing in the direction of intended rotation.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft, and by a generally crescent-shaped keyway adjoining the bore and defined in part by an arcuate surface extending from immediately adjacent the flat side end, and a retainer key positioned in the keyway and having a flat surface complementary with the flat side of the drive shaft and extending from immediately adjacent the flat side end, and an arcuate surEace complementary with the arcuate surEace of the keyway and extending from immediately adjacent the flat side end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an inner surface formed in part by a circular bore receiving the drive shaft and by a generally crescent-shaped keyway adjoining the bore and including a pointed end located immediately adjacent the flat side end and pointing in the direction of intended rotation, and an arcuate surface extending from the keyway pointed end, and a retainer key positioned in the keyway and including a pointed end located immediately adjacent the flat side end and being complementary with the pointed end of the keyway, a flat surface extending from the pointed end of the retainer key and being complementary with the flat side of the drive shaft, and an arcuate surface extending from the pointed end of the retainer key and being complementary with the arcuate surface of the keyway.
The invention also provides a fluid pump assembly comprising impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends from the end of the first port.ion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located
- 3 - 7363-66~
immediately adjacent the end of the first portion of the arcuate surface, and a retainer key positioned in the bore and having a flat surface complementary with the flat side of the drive shaft and extending from immediately adjacent the end of the flat side of the drive shaft, and an arcuate surface complementary with the second portion of the inner arcuate surface of the hub and extending from immediately adjacent the end of the first portion of the arcuate surface.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in and end and which has a constant radius and a second portion which extends from the end of the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located immediately adjacent the end of the first portion of ~he arcuate surface, and a retainer key positioned in ~he bore and including a poin~ed end located immediately adjacent to the ends of the flat side of the drive shaft and of the first portion of the arcuate surface and pointing in ~he direction of intended rotation, a flat surface extending from the pointed end and being complementary with the flat side of the drive shaft, and an arcuate surface extending from the pointed end and being complementary with the second portion of the inner arcuate surface of the hub.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a cross section having an outer periphery comprising a portion of circular shape having opposite ends and a flat portion extending between the ends, an impeller hub including an inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and including an arcuate surface having a first end extending smoothly from the bore, and a retainer key positioned in the keyway and having an arcuate surface complementary with the arcuate surface of the keyway, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which is complementary with the flat portion of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side with a predetermined length, an impeller nub including a circular bore having a radius and forming a part of an inner surface of the impeller hub, which circular bore receives the drive shaft, and a generally crescent-shaped keyway adjoining the bore and forming a part of the inner surface of the impeller hub and including an arcuate surface which includes a first end extending smoothly from the bore and which has a constant radius greater than the radius of the circular bore, and a retainer key positioned in the keyway and having an arcuate surface which is complementary with the arcuate surface of the keyway, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which has a length substantially equal to the length of the flat side of the drive shaft, which, at the -J~ 33 - 3~ - 7363-665 first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt portion located adjacent the second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a cross section having an outer periphery comprising a portion of circular shape having opposite ends and a flat portion extending between the ends and having a length, means for rotating the drive shaft, an impeller hub including a circular bore receiving the drive shaft and forming a part of an inner surface of the impeller hub, and a keyway adjoining the bore and forming a part of the inner surface of the impeller hub, which keyway is generally crescent-shaped and has an arcuate surface including a first end which extends smoothly from the bore, and a second end which extends transversely from the bore, and a retainer key having an arcuate surface which is complementary with the arcuate surface of the keyway and which includes an end, a flat surface which has a first end extending from the end of the arcuate surface of the retainer key, which i5 complementary with the flat portion of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end, which retainer key is positioned in the keyway such that, when the drive shaft is rotated in the direction from the blunt end of the key toward the pointed end of the key, the pointed end of the retainer key is wedged between the drive shaft and the impeller hub to lock the drive shaft and the impeller hub in a single driving relation to each other.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side, an impeller hub including an inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and defined, in part, by an arcuate surface including a first end which extends smoothly from the bore, and a retainer key positioned in tbe keyway and having an arcuate surface complementary with the arcuate surface of the keyway and including an end, a flat surface which has a first end extending from the end of the arcuate surface of the retainer key, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having a length, an impeller hub including an inner surface formedr in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and defined by an arcuate surface having a first end which extends smoothly from the bore and which, together with the flat side of th~
drive shaft, defines a pointed end, and a retainer key positioned in the keyway and having an arcuate surface which is complementary with the arcuate surface of the keyway, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which has a length substantially equal to the length of ~he flat side of the drive shaft, which, at the first end of the retainer key and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also pro1Jides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surace including a first portion having a constant radius and a second portion which extend~ smoothly from the first por~ion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side, and a retainer key positioned in the bore and having an arcuate surface which is complementary with the second portion of the inner arcuate surface of the hub, a flat surface which is complementary with the flat side of the drive shaft, which, at one end thereof and in cooperation with arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends smoothly from the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including ~ flat side with a predetermined length, and a retainer key positioned in the bore and having an arcuate surface which is complementary with the second portion of the inner arcuate surface of the hub, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which has a length substantially equal to the length of the flat side of the drive sbaft,
immediately adjacent the end of the first portion of the arcuate surface, and a retainer key positioned in the bore and having a flat surface complementary with the flat side of the drive shaft and extending from immediately adjacent the end of the flat side of the drive shaft, and an arcuate surface complementary with the second portion of the inner arcuate surface of the hub and extending from immediately adjacent the end of the first portion of the arcuate surface.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in and end and which has a constant radius and a second portion which extends from the end of the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located immediately adjacent the end of the first portion of ~he arcuate surface, and a retainer key positioned in ~he bore and including a poin~ed end located immediately adjacent to the ends of the flat side of the drive shaft and of the first portion of the arcuate surface and pointing in ~he direction of intended rotation, a flat surface extending from the pointed end and being complementary with the flat side of the drive shaft, and an arcuate surface extending from the pointed end and being complementary with the second portion of the inner arcuate surface of the hub.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a cross section having an outer periphery comprising a portion of circular shape having opposite ends and a flat portion extending between the ends, an impeller hub including an inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and including an arcuate surface having a first end extending smoothly from the bore, and a retainer key positioned in the keyway and having an arcuate surface complementary with the arcuate surface of the keyway, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which is complementary with the flat portion of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side with a predetermined length, an impeller nub including a circular bore having a radius and forming a part of an inner surface of the impeller hub, which circular bore receives the drive shaft, and a generally crescent-shaped keyway adjoining the bore and forming a part of the inner surface of the impeller hub and including an arcuate surface which includes a first end extending smoothly from the bore and which has a constant radius greater than the radius of the circular bore, and a retainer key positioned in the keyway and having an arcuate surface which is complementary with the arcuate surface of the keyway, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which has a length substantially equal to the length of the flat side of the drive shaft, which, at the -J~ 33 - 3~ - 7363-665 first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt portion located adjacent the second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a cross section having an outer periphery comprising a portion of circular shape having opposite ends and a flat portion extending between the ends and having a length, means for rotating the drive shaft, an impeller hub including a circular bore receiving the drive shaft and forming a part of an inner surface of the impeller hub, and a keyway adjoining the bore and forming a part of the inner surface of the impeller hub, which keyway is generally crescent-shaped and has an arcuate surface including a first end which extends smoothly from the bore, and a second end which extends transversely from the bore, and a retainer key having an arcuate surface which is complementary with the arcuate surface of the keyway and which includes an end, a flat surface which has a first end extending from the end of the arcuate surface of the retainer key, which i5 complementary with the flat portion of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end, which retainer key is positioned in the keyway such that, when the drive shaft is rotated in the direction from the blunt end of the key toward the pointed end of the key, the pointed end of the retainer key is wedged between the drive shaft and the impeller hub to lock the drive shaft and the impeller hub in a single driving relation to each other.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side, an impeller hub including an inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and defined, in part, by an arcuate surface including a first end which extends smoothly from the bore, and a retainer key positioned in tbe keyway and having an arcuate surface complementary with the arcuate surface of the keyway and including an end, a flat surface which has a first end extending from the end of the arcuate surface of the retainer key, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having a length, an impeller hub including an inner surface formedr in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and defined by an arcuate surface having a first end which extends smoothly from the bore and which, together with the flat side of th~
drive shaft, defines a pointed end, and a retainer key positioned in the keyway and having an arcuate surface which is complementary with the arcuate surface of the keyway, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which has a length substantially equal to the length of ~he flat side of the drive shaft, which, at the first end of the retainer key and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also pro1Jides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surace including a first portion having a constant radius and a second portion which extend~ smoothly from the first por~ion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side, and a retainer key positioned in the bore and having an arcuate surface which is complementary with the second portion of the inner arcuate surface of the hub, a flat surface which is complementary with the flat side of the drive shaft, which, at one end thereof and in cooperation with arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends smoothly from the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including ~ flat side with a predetermined length, and a retainer key positioned in the bore and having an arcuate surface which is complementary with the second portion of the inner arcuate surface of the hub, a flat surface which has a first end extending from one end of the arcuate surface of the retainer key, which has a length substantially equal to the length of the flat side of the drive sbaft,
- 4 - 7363-6~5 which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
~ he invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an :inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and defined, in part, by an arcuate surface extending smoothly from the bore and from immediately adjacent the flat side end, and a retainer key positioned in the keyway and having an arcuate surface complementary with the arcuate surface of the keyway and having an end immediately adjacent the flat side end, a flat surface which has a first end extending from the end of the arcuate surface o the retainer key, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaf~ including a flat side having an end and having a length, an impeller hub including an inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining th~ bore and including an arcuate surface extending smoothly from the bore and, together with the flat side of the ~haft, defining a pointed end located immediately adjacent the flat side end, and a retainer key positioned in the keyway and including a pointed end located immediately adjacent the flat side end and being complementary with the pointed end of the keyway, a blunt end spaced from the pointed end, a flat surface extending from the po.inted end of the retainer key to the blunt end and having a lenc~th substantially equal to the length o the flat side of the drive shaft, and an arcuate surface extending from the pointed end of the retainer key to the blunt end and being complementary with the arcuate surface of the keyway.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has constant radius and a second portion which extends smoothly from the end of the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located immediately adjacent the end of the first portion of the inner arcuate surface, and a retainer key positioned in the bore and having an arcuate surface complementary with the second portion of the inner arcuate surface of the hub and extending rrom immediately adjacent the end o the first portion of the inner arcuate surface, a flat surface whicn has a first end extending from immediately adjacent the end of the flat side of the drive shaft, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising an impeller hub including a 7 ~
bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends smoothly from the end o~ the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into ths bore and including a flat side having an end located immediately adjacent the end of the first portion of the inner arcuate surface, and a retainer key positioned in the bore and having an arcuate surface complementary wi~h the second portion of the inner arcuate surface of the hub and extending from immediately adjacent the end of the first portion of the inner arcuate surface, a flat surface which has a first end extending from immediately adjacent the end of the flat side of the drive shaft, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends smoothly from the end of the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located immediately adjacent the end of the first portion of the inner arcuate surface, and a retainer key positioned in the bore and including a pointed end located immediately adjacent to the end of the flat side of the drive shaft and the end of the first portion of the inner arcuate surface and pointing in the direction of intended rotation, a blunt end spaced from the pointed end, a flat surface extending from the pointed end to the blunt end and being complementary with the flat side of the drive shaft, and an arcuate surface extending from the pointed end to the blunt end and being complementary with the second portion of the inner arcuate surface of the hub.
In one embodiment, the retainer key is made of a deformable plastic.
A principal feature of the invention is that whlle the construction of the fluid pump assembly makes the impeller hub easy to install on and remove from the drive shaft, it also causes the drive shaft and the impeller hub to be maintained in a single driving relation to each other during rotation of the drive shaft.
Another principal feature of the invention is the simple construction of the impeller-drive shaft assembly.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, drawings, and claims.
DESCRIP?ION OF THE DRAWINGS
Fig. 1 is a side view of a marine propulsion device including a fluid pump assembly in accordance with the invention.
Fig. ~ is a cross-sectional view taken along line 2-2 in Fig. 1 and showing the impeller-drive shaft assembly of the invention.
Fig. 3 is a cross-sectional view of the impeller hub of Fig. 2.
~ he invention also provides a fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an :inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining the bore and defined, in part, by an arcuate surface extending smoothly from the bore and from immediately adjacent the flat side end, and a retainer key positioned in the keyway and having an arcuate surface complementary with the arcuate surface of the keyway and having an end immediately adjacent the flat side end, a flat surface which has a first end extending from the end of the arcuate surface o the retainer key, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising a substantially circular drive shaf~ including a flat side having an end and having a length, an impeller hub including an inner surface formed, in part, by a circular bore receiving the drive shaft and, in part, by a generally crescent-shaped keyway adjoining th~ bore and including an arcuate surface extending smoothly from the bore and, together with the flat side of the ~haft, defining a pointed end located immediately adjacent the flat side end, and a retainer key positioned in the keyway and including a pointed end located immediately adjacent the flat side end and being complementary with the pointed end of the keyway, a blunt end spaced from the pointed end, a flat surface extending from the po.inted end of the retainer key to the blunt end and having a lenc~th substantially equal to the length o the flat side of the drive shaft, and an arcuate surface extending from the pointed end of the retainer key to the blunt end and being complementary with the arcuate surface of the keyway.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has constant radius and a second portion which extends smoothly from the end of the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located immediately adjacent the end of the first portion of the inner arcuate surface, and a retainer key positioned in the bore and having an arcuate surface complementary with the second portion of the inner arcuate surface of the hub and extending rrom immediately adjacent the end o the first portion of the inner arcuate surface, a flat surface whicn has a first end extending from immediately adjacent the end of the flat side of the drive shaft, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising an impeller hub including a 7 ~
bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends smoothly from the end o~ the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into ths bore and including a flat side having an end located immediately adjacent the end of the first portion of the inner arcuate surface, and a retainer key positioned in the bore and having an arcuate surface complementary wi~h the second portion of the inner arcuate surface of the hub and extending from immediately adjacent the end of the first portion of the inner arcuate surface, a flat surface which has a first end extending from immediately adjacent the end of the flat side of the drive shaft, which is complementary with the flat side of the drive shaft, which, at the first end and in cooperation with the arcuate surface of the retainer key, defines a pointed end, and which has a second end, and a blunt end located at the second end.
The invention also provides a fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends smoothly from the end of the first portion and has a radius greater than the constant radius, a substantially circular drive shaft extending into the bore and including a flat side having an end located immediately adjacent the end of the first portion of the inner arcuate surface, and a retainer key positioned in the bore and including a pointed end located immediately adjacent to the end of the flat side of the drive shaft and the end of the first portion of the inner arcuate surface and pointing in the direction of intended rotation, a blunt end spaced from the pointed end, a flat surface extending from the pointed end to the blunt end and being complementary with the flat side of the drive shaft, and an arcuate surface extending from the pointed end to the blunt end and being complementary with the second portion of the inner arcuate surface of the hub.
In one embodiment, the retainer key is made of a deformable plastic.
A principal feature of the invention is that whlle the construction of the fluid pump assembly makes the impeller hub easy to install on and remove from the drive shaft, it also causes the drive shaft and the impeller hub to be maintained in a single driving relation to each other during rotation of the drive shaft.
Another principal feature of the invention is the simple construction of the impeller-drive shaft assembly.
Other features and advantages of the invention will become apparent to those skilled in the art upon review of the following detailed description, drawings, and claims.
DESCRIP?ION OF THE DRAWINGS
Fig. 1 is a side view of a marine propulsion device including a fluid pump assembly in accordance with the invention.
Fig. ~ is a cross-sectional view taken along line 2-2 in Fig. 1 and showing the impeller-drive shaft assembly of the invention.
Fig. 3 is a cross-sectional view of the impeller hub of Fig. 2.
- 5 - 7363-66~
Béfore explaining one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFERRED ~MBODIMENT
-Illustrated in Fig. 1 is a marine propulsion device 10 adapted for mounting on the transom of a boar. It is to be understood that while in this embodiment the marine propulsion device 10 is an outboard motor, in alternative embodiments, the marine propulsion device 10 could be of another type, including the inboard/outboard or stern drive type.
In this embodiment, the marine propulsion device 10 includes a generally conventional propulsion unit 13 incorporating a power head 15 with an internal combustion engine 17. The propulsion unit 13 also includes a lower unit 19 incorporating a rotatably mounted propeller 21 drivingly connected to the engine 17 through a drive shaft 22 and a selectively operable reversing
Béfore explaining one embodiment of the invention in detail, it is to be understood that the invention is not limited in its application to the details of construction and the arrangements of components set forth in the following description or illustrated in the drawings. The invention is capable of other embodiments and of being practiced or being carried out in various ways. Also, it is to be understood that the phraseology and terminology used herein is for the purpose of description and should not be regarded as limiting.
DESCRIPTION OF THE PREFERRED ~MBODIMENT
-Illustrated in Fig. 1 is a marine propulsion device 10 adapted for mounting on the transom of a boar. It is to be understood that while in this embodiment the marine propulsion device 10 is an outboard motor, in alternative embodiments, the marine propulsion device 10 could be of another type, including the inboard/outboard or stern drive type.
In this embodiment, the marine propulsion device 10 includes a generally conventional propulsion unit 13 incorporating a power head 15 with an internal combustion engine 17. The propulsion unit 13 also includes a lower unit 19 incorporating a rotatably mounted propeller 21 drivingly connected to the engine 17 through a drive shaft 22 and a selectively operable reversing
-6- '~
~ransmission Z3. The internal combustion engine 17 includes a generally conventional cooling jacket.
A water pump Z5 is provided to provide cooling water to the cooling jacket of the engine 17. In this embodiment, the water pump 25 is located in the middle of the drive shaft 22. It should be understood that, in alternative embodiments, ~he water pump 25 could be located anywhere that driving means can be provided. It should also be remembered that other types of marine propulsion devices might be employed.
The water pump 25 comprise& a housing including a pump chamber, a water inlet, and a wate~
outlet. Openings in the side of the propulsion unit 13 form the water intake which is connecred by a passage to the water inlet of the pump 25. The water outlet is connected to a passage which carries water to the engine cooling jacket. These features of the water pump assembly are not illustrated in the drawings because they are conventional and do not form a part of the invention.
The water pump 25 further comprises an impeller 35 within the housing. As best shown in Fig. 2, the impeller 35 comprise6 an impeller hub and a plurality of flexible vanes extending radially outwardly therefrom.
In this embodiment, as shown in Figs. 1 and 2, ths drive shafr 22 extends through the pump chamber, is generally circular, and includes a flat side, as illustrated in Fig. 2.
The impeller hub includes a circular bore 37 for receiving the drive shaft 22 and forming a part of the inner surface 39 of the impeller hub.
The impeller hub also includes a generally
~ransmission Z3. The internal combustion engine 17 includes a generally conventional cooling jacket.
A water pump Z5 is provided to provide cooling water to the cooling jacket of the engine 17. In this embodiment, the water pump 25 is located in the middle of the drive shaft 22. It should be understood that, in alternative embodiments, ~he water pump 25 could be located anywhere that driving means can be provided. It should also be remembered that other types of marine propulsion devices might be employed.
The water pump 25 comprise& a housing including a pump chamber, a water inlet, and a wate~
outlet. Openings in the side of the propulsion unit 13 form the water intake which is connecred by a passage to the water inlet of the pump 25. The water outlet is connected to a passage which carries water to the engine cooling jacket. These features of the water pump assembly are not illustrated in the drawings because they are conventional and do not form a part of the invention.
The water pump 25 further comprises an impeller 35 within the housing. As best shown in Fig. 2, the impeller 35 comprise6 an impeller hub and a plurality of flexible vanes extending radially outwardly therefrom.
In this embodiment, as shown in Figs. 1 and 2, ths drive shafr 22 extends through the pump chamber, is generally circular, and includes a flat side, as illustrated in Fig. 2.
The impeller hub includes a circular bore 37 for receiving the drive shaft 22 and forming a part of the inner surface 39 of the impeller hub.
The impeller hub also includes a generally
7~
crescent-6haped keyway 41 adjoining the bore 37 and forming a part of the inner surface 39 of the impeller hub. As best shown in Fig. 3, the kayway 41 has opposite ends, one of the ends being blunt, and an arcuate surface extending between the ends. In the preferred em~odiment, the arcuate surface has a constant radius that is greater than the radius of the circular bore 37, for reasons explained below, although any similae arcuate surface is within the scope of the invention.
The pump Z5 also includes a retainer key 43 positioned in the keyway 41, as shown in Fig.
2. The retainer key 43 has a flat surface complementary with the flat side of the drive shaft 22, an arcuate surface complementary with the arcuate surface of the keyway 41, and a blunt end complementary with the blunt end of the keyway 41.
In the preferred embodiment, the blunt ends of the keyway 41 and retaineL key 43 are circular, as shown in Figs. 2 and 3, and the length of the flat side of the retainer key 43 is not greater than the length of the flat side of the drive shaft 22.
As shown in Fig. 2, the retainer key 43 is somewhat smaller than the keyway 41 so that the fit between the retainer key 43 and the impeller hub and drive shaft 22 is not snug. This allows easy installation and removal of the impeller 35.
To install the impeller 35 onto the drive shaft 22, the retainer key 43 is slid into the keyway 41, and then the impeller 35 is slid over the drive shaft 22 so that the drive shaft 22 is received in the circular bore 37 in the impeller hub. Because the fit between the retainer key 43 and the impeller hub and drive shaft 22 is not snug, it is very easy f~
to ~lide the impeller 35 onto the drive shaft 22.
The impeller 35 is oriented relative to the drive shaft 22 so that during normal operating rotation of the drive shaft 22, the drive shaft 22 will rotate in the directlon from the blunt end of the keyway 41 toward the pointed end of the keyway 41, as shown by the arrow in Fig. 2.
Normal operating rotation (shown hy the arrow in Fig. 2) of the dcive shaft 22 will cause the pointed end of the retainer key 43 to become wedged or fixed between rhe drive shaft 22 and the impeller hub at tne pointed end of the keyway 41. This wedging action will cause the drive shaft 22 and the impeller hub to be locked in a single driving relation to each other, thus avoiding wearing action between the impsller hub and the drive shaft 22. The preferred shape of the arcuate surfaces of the keyway 41 and retainer key 43, an arc havinq a constant radius that is greater than the radius of ths circular bore 37, improves this wedging action.
Furthermore, since the retainer key 43 is preferably made of a deformable plastic, the retainer key 43 will conform to the shape of the inner surface 39 of the impeller hub, thereby essentially eliminating close tolerance and corrosion through electrolysis.
Also, the retainer key 43 will remain wedged between the drive shaft 22 and the impeller hub when rotation of the drive shaft Z2 is stopped.
Therefore, little or no wearing action will occur during stopping and starting of the pump 25.
To remove the impeller 35, the impeller 35 is rotated relative to the drive shaft 22 in the direction that is the reverse of the direction of normal operating rotation. This reverse rotation of _9_ the impeller 35 will unwedge the retainer key 43 from between the drive shaft 22 and the impeller hub and will cause the blunt end of the keyway 41 to engage the blunt end of the retainer key 43. Because of the configuration of these blunt ends, the retainer key 43 cannot become wedged bstween the drive shaft 2Z
and ~he impeller hub when the blunt ends engage due to reverse rotation of the drive shaft 22, Therefore, roration of the impeller 35 in this reverse direction will release th~ drive shaft ZZ, retainar key 43, and impelle~ hub from their wedged position, leaving the retainer key 43 loosely received in the keyway 41 between the drive shaft 22 and rhe impeller hub. From this position, it is very easy to remove the impeller 35 and retainer key 43 from the drive shaft 2Z.
Various of the features of the invention are set forth in the following claims:
crescent-6haped keyway 41 adjoining the bore 37 and forming a part of the inner surface 39 of the impeller hub. As best shown in Fig. 3, the kayway 41 has opposite ends, one of the ends being blunt, and an arcuate surface extending between the ends. In the preferred em~odiment, the arcuate surface has a constant radius that is greater than the radius of the circular bore 37, for reasons explained below, although any similae arcuate surface is within the scope of the invention.
The pump Z5 also includes a retainer key 43 positioned in the keyway 41, as shown in Fig.
2. The retainer key 43 has a flat surface complementary with the flat side of the drive shaft 22, an arcuate surface complementary with the arcuate surface of the keyway 41, and a blunt end complementary with the blunt end of the keyway 41.
In the preferred embodiment, the blunt ends of the keyway 41 and retaineL key 43 are circular, as shown in Figs. 2 and 3, and the length of the flat side of the retainer key 43 is not greater than the length of the flat side of the drive shaft 22.
As shown in Fig. 2, the retainer key 43 is somewhat smaller than the keyway 41 so that the fit between the retainer key 43 and the impeller hub and drive shaft 22 is not snug. This allows easy installation and removal of the impeller 35.
To install the impeller 35 onto the drive shaft 22, the retainer key 43 is slid into the keyway 41, and then the impeller 35 is slid over the drive shaft 22 so that the drive shaft 22 is received in the circular bore 37 in the impeller hub. Because the fit between the retainer key 43 and the impeller hub and drive shaft 22 is not snug, it is very easy f~
to ~lide the impeller 35 onto the drive shaft 22.
The impeller 35 is oriented relative to the drive shaft 22 so that during normal operating rotation of the drive shaft 22, the drive shaft 22 will rotate in the directlon from the blunt end of the keyway 41 toward the pointed end of the keyway 41, as shown by the arrow in Fig. 2.
Normal operating rotation (shown hy the arrow in Fig. 2) of the dcive shaft 22 will cause the pointed end of the retainer key 43 to become wedged or fixed between rhe drive shaft 22 and the impeller hub at tne pointed end of the keyway 41. This wedging action will cause the drive shaft 22 and the impeller hub to be locked in a single driving relation to each other, thus avoiding wearing action between the impsller hub and the drive shaft 22. The preferred shape of the arcuate surfaces of the keyway 41 and retainer key 43, an arc havinq a constant radius that is greater than the radius of ths circular bore 37, improves this wedging action.
Furthermore, since the retainer key 43 is preferably made of a deformable plastic, the retainer key 43 will conform to the shape of the inner surface 39 of the impeller hub, thereby essentially eliminating close tolerance and corrosion through electrolysis.
Also, the retainer key 43 will remain wedged between the drive shaft 22 and the impeller hub when rotation of the drive shaft Z2 is stopped.
Therefore, little or no wearing action will occur during stopping and starting of the pump 25.
To remove the impeller 35, the impeller 35 is rotated relative to the drive shaft 22 in the direction that is the reverse of the direction of normal operating rotation. This reverse rotation of _9_ the impeller 35 will unwedge the retainer key 43 from between the drive shaft 22 and the impeller hub and will cause the blunt end of the keyway 41 to engage the blunt end of the retainer key 43. Because of the configuration of these blunt ends, the retainer key 43 cannot become wedged bstween the drive shaft 2Z
and ~he impeller hub when the blunt ends engage due to reverse rotation of the drive shaft 22, Therefore, roration of the impeller 35 in this reverse direction will release th~ drive shaft ZZ, retainar key 43, and impelle~ hub from their wedged position, leaving the retainer key 43 loosely received in the keyway 41 between the drive shaft 22 and rhe impeller hub. From this position, it is very easy to remove the impeller 35 and retainer key 43 from the drive shaft 2Z.
Various of the features of the invention are set forth in the following claims:
Claims (40)
1. A fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving said drive shaft and by a generally crescent-shaped keyway adjoining said bore and having opposite ends, one of said ends being blunt, and an arcuate surface extending between said ends, and a retainer key positioned in said keyway and having a flat surface complementary with said flat side of said drive shaft, an arcuate surface complementary with said arcuate surface of said keyway, and a blunt end complementary with said blunt end of said keyway.
2. A fluid pump assembly as set forth in claim 1 wherein said retainer key is made of a deformable plastic.
3. A fluid pump assembly as set forth in claim 3 wherein said circular bore in said impeller has a radius, and wherein said arcuate surface of said keyway has a constant radius that is greater than the radius of said circular bore.
4. A fluid pump assembly as set forth in claim 3 wherein said retainer key is made of a deformable plastic.
5. A fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including a circular bore having a radius and forming a part of an inner surface of said impeller hub, said circular bore receiving said drive shaft, and a generally crescent-shaped keyway adjoining said bore and forming a part of said inner surface of said impeller hub and having opposite ends, one of said ends being blunt, and an arcuate surface extending between said ends and having a constant radius that is greater than the radius of said circular bore, and a generally crescent-shaped retainer key positioned in said keyway and having a flat surface complementary with said flat side of said drive shaft, an arcuate surface complementary with said arcuate surface of said keyway, and a blunt end complementary with said blunt end of said keyway.
6. A fluid pump assembly as set forth in claim 5 wherein said retainer key is made of a deformable plastic.
7. A fluid pump assembly comprising a circular drive shaft including a flat having a length, means for rotating said drive shaft, an impeller hub including a circular bore receiving said drive shafr and forming a part of an inner surface of said impeller hub, and a keyway adjoining said bore and forming a part of said inner surface of said impeller hub, said keyway being generally crescent-shaped and having opposite ends, one of said opposite ends being blunt, and an arcuate surface extending between said ends, and a generally crescent-shaped retainer key having a flat with a length not greater than said length of said flat of said drive shaft, an arcuate surface complementary with said arcuate surface of said keyway, a blunt end complementary with said blunt end of said keyway, and a pointed end opposite said blunt end, said retainer key being positioned in said keyway such that, when said drive shaft is rotated in the direction from said blunt end of said keyway toward the opposite end of said keyway, said pointed end of said retainer key is wedged between said drive shaft and said impeller hub to lock said drive shaft and said impeller hub in a single driving relation to each other.
8. A fluid pump assembly as set forth in claim 7 wherein said retainer key is made of a deformable plastic.
9. A fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving said drive shaft and by a generally crescent-shaped keyway adjoining said bore and defined in part by an arcuate surface and a retainer key positioned in said keyway and having a flat surface complementary with said flat side of said drive shaft, and an arcuate surface complementary with said arcuate surface of said keyway.
10. A fluid pump assembly as set forth in Claim 9 wherein said retainer key is made of a deformable plastic.
11. A fluid pump assembly comprising a circular drive shaft including a flat side, an impeller hub including an inner surface formed in part by a circular bore receiving said drive shaft and by a generally crescent-shaped keyway adjoining said bore and having a pointed end pointing in the direction of intended rotation, and an arcuate surface extending from said pointed end, and a retainer key positioned in said keyway and having a flat surface complementary with said flat side of said drive shaft, an arcuate surface complementary with said arcuate surface of said keyway, and a pointed end complementary with said pointed end of said keyway.
12. A fluid pump assembly as set forth in Claim 11 wherein said retainer key is made of a deformable plastic.
13. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends from said first portion and has a radius greater than said constant radius, a circular drive shaft extending into said bore and including a flat side, and a retainer key positioned in said bore and having a flat surface complementary with said flat side of said dirve shaft, and an arcuate surface complementary with said second portion of said inner arcuate surface of said hub.
14. A fluid pump assembly as set forth in Claim 13 wherein said retainer key is made of a deformable plastic.
15. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends from said first portion and has a radius greater than said constant radius, a circular drive shaft extending into said bore and including a flat side, and a retainer key positioned in said bore and having a flat surface complementary with said flat side of said drive shaft, an arcuate surface complementary with said second portion of said inner arcuate surface of said hub, and a pointed end pointing in the direction of intended rotation.
16. A fluid pump assembly as set forth in Claim 15 wherein said retainer key is made of a deformable plastic.
17. A fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an inner surface formed in part by a circular bore receiving said drive shaft, and by a generally crescent-shaped keyway adjoining said bore and defined in part by an arcuate surface extending from immediately adjacent said flat side end, and a retainer key positioned in said keyway and having a flat surface complementary with said flat side of said drive shaft and extending from immediately adjacent said flat side end, and an arcuate surface complementary with said arcuate surface of said keyway and extending from immediately adjacent said flat side end.
18. A fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an inner surface formed in part by a circular bore receiving said drive shaft and by a generally crescent-shaped keyway adjoining said bore and including a pointed end located immediately adjacent said flat side end and pointing in the direction of intended rotation, and an arcuate surface extending from said keyway pointed end, and a retainer key positioned in said keyway and including a pointed end located immediately adjacent said flat side end and being complementary with said pointed end of said keyway, a flat surface extending from said pointed end of said retainer key and being complementary with said flat side of said drive shaft, and an arcuate surface extending from said pointed end of said retainer key and being complementary with said arcuate surface of said keyway.
19. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends from said end of said first portion and has a radius greater than said constant radius, a substantially circular drive shaft extending into said bore and including a flat side having an end located immediately adjacent said end of said first portion of said arcuate surface, and a retainer key positioned in said bore and having a flat surface complementary with said flat side of said drive shaft and extending from immediately adjacent said end of said flat side of said drive shaft, and an arcuate surface complementary with said second portion of said inner arcuate surface of said hub and extending from immediately adjacent said end of said first portion of said arcuate surface.
20. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends from said end of said first portion and has a radius greater than said constant radius, a substantially circular drive shaft extending into said bore and including a flat side having an end looated immediately adjacent said end of said first portion of said arcuate surface, and a retainer key positioned in said bore and including a pointed end located immediately adjacent to said ends of said flat side of said drive shaft and of said first portion of said arcuate surface and pointing in the direction of intended rotation, a flat surface extending from said pointed end and being complementary with said flat side of said drive shaft, and an arcuate surface extending from said pointed end and being complementary with said second portion of said inner arcuate surface of said hub.
21. A fluid pump assembly comprising a substantially circular drive shaft including a cross section having an outer periphery comprising a portion of circular shape having opposite ends and a flat portion extending between said ends, an impeller hub including an inner surface formed, in part, by a circular bore receiving said drive shaft and, in part, by a generally crescent-shaped keyway adjoining said bore and including an arcuate surface having a first end extending smoothly from said bore, and a retainer key positioned in said keyway and having an arcuate surface complementary with said arcuate surface of said keyway, a flat surface which has a first end extending from one end of said arcuate surface of said retainer key, which is complementary with said flat portion of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
22. A fluid pump assembly as set forth in claim 21 wherein said retainer key is made of a deformable plastic.
23. A fluid pump assembly as set forth in claim 21 wherein said circular bore in said impeller has a radius, and wherein said arcuate surface of said keyway has a portion with a constant radius that is greater than the radius of said circular bore.
24. A fluid pump assembly as set forth in claim 21 wherein said retainer key is made of a deformable plastic.
25. A fluid pump assembly comprising a substantially circular drive shaft including a flat side with a predetermined length, an impeller hub including a circular bore having a radius and forming a part of an inner surface of said impeller hub, said circular bore receiving said drive shaft, and a generally crescent-shaped keyway adjoining said bore and forming a part of said inner surface of said impeller hub and including an arcuate surface which includes a first end extending smoothly from said bore and which has a constant radius greater than the radius of said circular bore, and a retainer key positioned in said keyway and having an arcuate surface which is complementary with said arcuate surface of said keyway, a flat surface which has a first end extending from one end of said arcuate surface of said retainer key, which has a length substantially equal to said length of said flat side of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt portion located adjacent said second end.
26. A fluid pump assembly as set forth in Claim 25 wherein said retainer key is made of a deformable plastic.
27. A fluid pump assembly comprising a substantially circular drive shaft including a cross section having an outer periphery comprising a portion of circular shape having opposite ends and a flat portion extending between said ends and having a length, means for rotating said drive shaft, an impeller hub including a circular bore receiving said drive shaft and forming a part of an inner surface of said impeller hub, and a keyway adjoining said bore and forming a part of said inner surface of said impeller hub, said keyway being generally crescent-shaped and having an arcuate surface including a first end which extends smoothly from said bore, and a second end which extends transversely from said bore, and a retainer key having an arcuate surface which is complementary with said arcuate surface of said keyway and which includes an end, a flat surface which has a first end extending from said end of said arcuate surface of said retainer key, which is complementary with said flat portion of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end, said retainer key being positioned in said keyway such that, when said drive shaft is rotated in the direction from said blunt end of said key toward said pointed end of said key, said pointed end of said retainer key is wedged between said drive shaft and said impeller hub to lock said drive shaft and said impeller hub in a single driving relation to each other.
28. A fluid pump assembly as set forth in Claim 27 wherein said retainer key is made of a deformable plastic.
29. A fluid pump assembly comprising a substantially circular drive shaft including a flat side, an impeller hub including an inner surface formed, in part, by a circular bore receiving said drive shaft and, in part, by a generally crescent-shaped keyway adjoining said bore and defined, in part, by an arcuate surface including a first end which extends smoothly from said bore, and a retainer key positioned in said keyway and having an arcuate surface complementary with said arcuate surface of said keyway and including an end, a flat surface which has a first end extending from said end of said arcuate surface of said retainer key, which is complementary with said flat side of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
30. A fluid pump assembly as set forth in Claim 29 wherein said retainer key is made of a deformable plastic.
31. A fluid pump assembly comprising a substantially circular drive shaft including a flat side having a length, an impeller hub including an inner surface formed, in part, by a circular bore receiving said drive shaft and, in part, by a generally crescent-shaped keyway adjoining said bore and defined by an arcuate surface having a first end which extends smoothly from said bore and which, together with said flat side of said drive shaft, defines a pointed end, and a retainer key positioned in said keyway and having an arcuate surface which is complementary with said arcuate surface of said keyway, a flat surface which has a first end extending from one end of said arcuate surface of said retainer key, which has a length substantially equal to said length of said flat side of said drive shaft, which, at said first end of said retainer key and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
32. A fluid pump assembly as set forth in Claim 31 wherein said retainer key is made of a deformable plastic.
33. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends smoothly from said first portion and has a radius greater than said constant radius, a substantially circular drive shaft extending into said bore and including a flat side, and a retainer key positioned in said bore and having an arcuate surface which is complementary with said second portion of said inner arcuate surface of said hub, a flat surface which is complementary with said flat side of said drive shaft, which, at one end thereof and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
34. A fluid pump assembly as set forth in Claim 33 wherein said retainer key is made of a deformable plastic.
35. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion having a constant radius and a second portion which extends smoothly from said first portion and has a radius greater than said constant radius, a substantially circular drive shaft extending into said bore and including a flat side with a predetermined length, and a retainer key positioned in said bore and having an arcuate surface which is complementary with said second portion of said inner arcuate surface of said hub, a flat surface which has a first end extending from one end of said arcuate surface of said retainer key, which has a length substantially equal to said length of said flat side of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
36. A fluid pump assembly as set forth in Claim 35 wherein said retainer key is made of a deformable plastic.
37. A fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end, an impeller hub including an inner surface formed, in part, by a circular bore receiving said drive shaft and, in part, by a generally crescent-shaped keyway adjoining said bore and defined, in part, by an arcuate surface extending smoothly from said bore and from immediately adjacent said flat side end, and a retainer key positioned in said keyway and having an arcuate surface complementary with said arcuate surface of said keyway and having an end immediately adjacent said flat side end, a flat surface which has a first end extending from said end of said arcuate surface of said retainer key, which is complementary with said flat side of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
38. A fluid pump assembly comprising a substantially circular drive shaft including a flat side having an end and having a length, an impeller hub including an inner surface formed, in part, by a circular bore receiving said drive shaft and, in part, by a generally crescent-shaped keyway adjoining said bore and including an arcuate surface extending smoothly from said bore and, together with said flat side of said shaft, defining a pointed end located immediately adjacent said flat side end, and a retainer key positioned in said keyway and including a pointed end located immediately adjacent said flat side end and being complementary with said pointed end of said keyway, a blunt end spaced from said pointed end, a flat surface extending from said pointed end of said retainer key to said blunt end and having a length substantially equal to said length of said flat side of said drive shaft, and an arcuate surface extending from said pointed end of said retainer key to said blunt end and being complementary with said arcuate surface of said keyway.
39. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends smoothly from said end of said first portion and has a radius greater than said constant radius, a substantially circular drive shaft extending into said bore and including a flat side having an end located immediately adjacent said end of said first portion of said inner arcuate surface, and a retainer key positioned in said bore and having an arcuate surface complementary with said second portion of said inner arcuate surface of said hub and extending from immediately adjacent said end of said first portion of said inner arcuate surface, a flat surface which has a first end extending from immediately adjacent said end of said flat side of said drive shaft, which is complementary with said flat side of said drive shaft, which, at said first end and in cooperation with said arcuate surface of said retainer key, defines a pointed end, and which has a second end, and a blunt end located at said second end.
40. A fluid pump assembly comprising an impeller hub including a bore having an inner arcuate surface including a first portion which terminates in an end and which has a constant radius and a second portion which extends smoothly from said end of said first portion and has a radius greater than said constant radius, a substantially circular drive shaft extending into said bore and including a flat side having an end located immediately adjacent said end of said first portion of said inner arcuate surface, and a retainer key positioned in said bore and including a pointed end located immediately adjacent to said end of said flat side of said drive shaft and said end of said first portion of said inner arcuate surface and pointing in the direction of intended rotation, a blunt end spaced from said pointed end, a flat surface extending from said pointed end to said blunt end and being complementary with said flat side of said drive shaft, and an arcuate surface extending from said pointed end to said blunt end and being complementary with said second portion of said inner arcuate surface of said hub.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| US604,930 | 1975-08-15 | ||
| US60493084A | 1984-04-27 | 1984-04-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA1247388A true CA1247388A (en) | 1988-12-28 |
Family
ID=24421601
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA000477605A Expired CA1247388A (en) | 1984-04-27 | 1985-03-27 | Water pump for marine propulsion devices |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPS60244696A (en) |
| CA (1) | CA1247388A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8057199B2 (en) | 2006-01-26 | 2011-11-15 | Jiangmen Idear Hanyu Electrical | Centrifugal drainage pump with shock absorbing coupling arrangment |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5720482A (en) * | 1980-07-10 | 1982-02-02 | Mitsubishi Electric Corp | Light emitting diode |
-
1985
- 1985-03-27 CA CA000477605A patent/CA1247388A/en not_active Expired
- 1985-04-26 JP JP60090756A patent/JPS60244696A/en active Granted
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8057199B2 (en) | 2006-01-26 | 2011-11-15 | Jiangmen Idear Hanyu Electrical | Centrifugal drainage pump with shock absorbing coupling arrangment |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS60244696A (en) | 1985-12-04 |
| JPH0418597B2 (en) | 1992-03-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US4392779A (en) | Marine drive water pump | |
| EP0498825B1 (en) | A pressure exchanger | |
| JPH04107499U (en) | water pump | |
| US4778419A (en) | Reverse thrust propeller | |
| US6352408B1 (en) | Slip inhibiting boat propeller | |
| US5487650A (en) | Automotive fuel pump with helical impeller | |
| US5660536A (en) | High capacity simplified sea water pump | |
| CA1247388A (en) | Water pump for marine propulsion devices | |
| CA1220672A (en) | Water pump location for marine propulsion device | |
| US4673359A (en) | Water pump for marine propulsion devices | |
| US4592733A (en) | Water pump for marine propulsion devices | |
| CA1164729A (en) | Marine drive water pump | |
| US6732680B1 (en) | Internal combustion engine with liquid coolant pump | |
| JPS62153596A (en) | Water pump | |
| US5125799A (en) | Impeller structure for pump | |
| JPH0749023Y2 (en) | Cooling water pump for ship propulsion system | |
| KR0132014Y1 (en) | Water pump with a pressure reward valve | |
| US3869775A (en) | Liquid propulsion apparatus and method of fabrication | |
| US5178567A (en) | Marine engine housing cooling apparatus | |
| JPH06221274A (en) | Oil pump for automatic transmission | |
| US5509830A (en) | Marine propulsor cooling and lubricating system | |
| US5018999A (en) | Propeller driving device of marine propulsion unit | |
| WO2004046558A1 (en) | Centrifugal pump | |
| JPH05306687A (en) | Rotary liquid pump | |
| JPS58218497A (en) | Cowling device of outboard engine |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| MKEX | Expiry |