Rotary kinetic fluid motors or pumps – Bearing – seal – or liner between runner portion and static part – Means to seal radial flow pump runner inlet from outlet
Reexamination Certificate
1999-09-16
2001-08-07
Look, Edward K. (Department: 3745)
Rotary kinetic fluid motors or pumps
Bearing, seal, or liner between runner portion and static part
Means to seal radial flow pump runner inlet from outlet
C415S173100, C415S206000
Reexamination Certificate
active
06270314
ABSTRACT:
BACKGROUND OF THE INVENTION
This invention relates to a water pump and, in particular, a water pump that is disposed in a cooling passage that provides cooling for an internal combustion engine.
Many different types of such water pump have been proposed. One such pump has the cooling passage formed by combining a pump casing with a pump cover. An example is the water pump disclosed in Japanese unexamined publication (koukai)11-125118. There the water pump includes a plate that is disposed for dividing a water circulation cavity into an inlet passage and an outlet passage. The plate is formed of a thin metal material and is disposed between the pump casing and the pump cover. However, if a force holding the plate in position is weak, it is possible for a gap to occur between the pump casing, the pump cover, and the plate. In such case, the plate can not divide the outlet passage from the inlet passage. For example, a difference in a pressure between the inlet passage and the outlet passage causes the coolant to leak within the water circulation cavity between the inlet passage and the outlet passage. Namely, the coolant flowing in the outlet passage might leak to the inlet passage through the gap. As a result, the leakage reduces the efficiency of the pump.
It is, therefor, a principal object of this invention to provide an improved and high efficiency water pump for an internal combustion engine that prevents leakage in the water circulation cavity.
SUMMARY OF THE INVENTION
A first feature of this invention concerns the design of a water pump for an internal combustion engine having a single circulation cavity for water. A pump casing and a pump cover form a single circulation cavity therein, and a plate is disposed on a interface of them. The plate divides the circulation cavity into an inlet passage and an outlet passage. The plate has a seal portion that prevents a gap formed between the inlet passage and the outlet passage and leakage.
Another feature of this invention concerns the design of a water pump with a seal portion for a plate that is formed by a bent part of the plate so that a sealing contact is made on the interface of the pump casing and the pump cover. The plate can be made of a thin metal plate or a thin synthetic resin and is disposed at the interface of the pump casing and the pump cover and effectively divides the circulation cavity into the inlet passage and the outlet passage. Therefore, we obtain the water pump that prevents the leaking a coolant from the gap and improves the efficiency of the water pump for an internal combustion engine. The seal portion is formed of a bent part of the plate, so this invention is simple and easily formed.
REFERENCES:
patent: 3153382 (1964-10-01), Blarcom, Jr.
patent: 3620642 (1971-11-01), Studebaker
patent: 3741679 (1973-06-01), Johnston
patent: 11125118 (1999-05-01), None
Look Edward K.
Nguyen Ninh
Sughrue Mion Zinn Macpeak & Seas, PLLC
Unisa Jecs Corporation
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