Pumps – Motor driven – Pump and motor interconnected by endless flexible...
Patent
1996-04-08
1998-08-18
Izaguirre, Ismael
Pumps
Motor driven
Pump and motor interconnected by endless flexible...
474 92, F04B 1705
Patent
active
057951373
DESCRIPTION:
BRIEF SUMMARY
TECHNICAL FIELD
The present invention relates to a water pump for an internal combustion engine, and more particularly, to an improvement in a water pump to be mounted so as to rotate pump vanes utilizing the rotatory force of the engine.
BACKGROUND ART
Conventionally, a water pump for an internal combustion engine has been mounted on a construction machine and the like to be driven coaxially with a radiator fan (for example, see Japanese Utility Model Publication No. 62-18651). In this configuration, the water pump is constructed as a centrifugal pump as shown in FIG. 5. An impeller 2 is contained in a pump housing 1, and a rotary shaft 3 of the impeller 2 is supported, through bearings 5, by an extension portion 4 of the pump housing 1. An end of this rotary shaft 3 projects from a shaft insertion hole 6 of the extension portion 4, and a hood 8 is mounted to the projecting portion of the shaft 3. This hood 8 is shaped so as to cover the extension portion 4 and includes a rotation transmitting pulley 7 at an outer circumferential surface portion thereof. A rotation transmitting belt from a drive shaft of the internal combustion engine is looped over the pulley 7, and a pumping action is effected by rotation of the shaft 3.
Incidentally, this type of water pump is mounted on a radiator portion of the internal combustion engine. Therefore, since the pump is disposed in an environment where it is exposed to dust and the like, the shaft insertion hole 6, which the bearing 5 is facing, is enclosed by the hood 8, and an oil and dust seal 9 is position in the shaft insertion hole 6. In this way, the bearing 5 may be protected from dust and the like.
However, according to the construction of the above described water pump for an internal combustion engine, it is necessary to mount the dust seal 9 and the like so as to prevent dust in a space 10 from entering the bearing 5, which is provided on the forward portion of the water pump. For this reason, there is a problem in that the structure becomes complicated, and the diameter of the pump housing 1 increases so that the pump itself becomes large in size.
SUMMARY OF THE INVENTION
The present invention has been made to solve the drawbacks of the prior art, and particularly has an object to provide a water pump for an internal combustion engine capable of effectively preventing the entry of dust into a bearing for the impeller shaft.
A first aspect of a water pump for an internal combustion engine according to the present invention is characterized in that a boss having a fan integrally formed on the outer circumferential portion thereof is mounted on the impeller shaft, and the boss is detachably mounted on the inner side of the hood, and that the inflow of dust into the bearings is prevented by the fan. In addition, the hood can be provided with radial blowout holes adjacent to the outer circumference of the fan.
By such a construction, the fan is mounted to the impeller shaft and rotates with the impeller shaft, and the dust which would enter into the bearing portion can be discharged outwardly by wind pressure from-the rotation of the fan. More particularly, by the provision of the blowout holes in the hood, the fan can blow external air from within the hood out through the blowout holes. That is, dust enters from the edge opening, formed between the pulley end of the hood and the pump housing, and from the blowout holes, but strikes the rotating fan to be blown out radially around the circumference of the fan. Since the blown-out dust is discharged outwardly from the blowout holes which are formed radially, the entry of dust into the bearing portion can be prevented. On the other hand, when the blowout holes are not provided, dust is not necessarily discharged rapidly due to the fact that dust blown out by the fan impacts against the inner surface of the hood and returns. However, a rapid discharge property can be obtained by providing the blowout holes. Furthermore, since the entry of dust can be effectively prevented by a small fan power, there is no ne
REFERENCES:
patent: 4618334 (1986-10-01), Miranti, Jr.
patent: 5125795 (1992-06-01), Suzuki et al.
patent: 5490814 (1996-02-01), Whitenight
Fukushima Hidetada
Hukui Akihumi
Nishiyama Toshihiko
Ozawa Godo
Shinohara Masaki
Izaguirre Ismael
Komatsu Ltd.
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