Internal-combustion engines – Cooling – With liquid coolant circulating means
Reexamination Certificate
1999-03-04
2001-07-10
Kwon, John (Department: 3747)
Internal-combustion engines
Cooling
With liquid coolant circulating means
C123S041410, C417S423100
Reexamination Certificate
active
06257177
ABSTRACT:
FIELD OF THE INVENTION
The present invention relates to a water pump for a cooling circuit of an internal combustion engine.
RELATED TECHNOLOGY
Water pumps are known to be used for the cooling circuit of internal combustion engines using control via thermostats that switch the cooling circuit depending on the temperature. The water pump can be driven mechanically by a belt drive driven by the engine or also electrically. Timed valves, gate valves and rotary valves with stepping motor drives are known in practice for switching the coolant streams and the heating circuit.
German Patent Application No. 43 24 749 A1 describes a control valve for a cooling circuit having a radial inlet and three radial discharges, the coolant being distributed by a rotary valve.
A disadvantage of this control valve is that the rotary valve is constantly subjected to forces that may cause it to seize up and/or requires a suitably powerful drive motor for displacing it. In addition, the displacement or mixed positions are limited.
German Patent No.41 25 366 C1 describes a 3/2-way valve for liquid circuits in motor vehicles having one axial inlet and two radial discharges. The adjustment options of this valves are also limited, so that additional devices are needed for controlling a cooling or heating circuit.
German Patent No. 44 38 552 C1 describes a temperature control device for the cooling circuit of an internal combustion engine, which is provided with actuating elements for a switching gate mounted on a switching shaft. The switching gate shaft is located in the area of an imaginary wall line of the coolant recirculating pipe or pump feed pipe and in the area of junction of the bypass line with the pump inlet. To actuate the switching gate, a temperature expansion element, known as a wax cartridge, is provided.
SUMMARY OF THE INVENTION
An object of the present invention is to provide a control device for the cooling circuit of an internal combustion engine, which contains a plurality of cooling circuit elements and a plurality of actuating and switching element functions in a very compact design.
The present invention therefore provides a water pump for the cooling circuit of an internal combustion engine, in particular of a motor vehicle, comprising a pump housing and a pump device driven in the pump housing, in particular a centrifugal pump, characterized in that a servo valve (
5
) having a rotary gate (
6
) is integrated in the pump housing (
1
), the rotary gate (
6
) being at least approximately sleeve-shaped and being provided with an axial main opening (
7
) for the inlet or discharge of cooling medium to the suction or pressure side of the pump device (
3
), inlet and discharge openings (
9
,
10
,
11
) being provided in the peripheral wall of the pump housing (
1
) for a cooler line (
8
) connected to the cooler and for at least one additional partial circuit, the rotary gate (
6
) having a control opening (
13
) in its peripheral wall with an opening width through which a connection from the main opening (
7
) to an individual inlet or discharge opening (
9
,
10
,
11
) or for a mixed operation to two adjacent inlet or discharge openings (
9
,
10
,
11
) is created.
By integrating the servo valve in the water pump housing according to the present invention, a very compact component is achieved, with several switching servo valve positions being possible if the servo valve is properly designed, so that additional control elements in a cooling circuit or possibly a heating circuit of an internal combustion engine can be omitted if necessary. In this case, not only the different functions or switching positions can be implemented, but also the mechanical components required for control can be accommodated in the pump housing or fange mounted onto the pump housing.
With a design according to the present invention , the entire cooling and possibly heating circuit can be controlled virtually with a single device in many of the cases that may occur in practice. With a servo valve according to the present invention, individual openings can be controlled, while mixed operation is also possible, so that no additional control elements are needed in the cooling and heating circuit.
With a design of the servo valve according to the present invention as a rotary valve with axial inlet or discharge of coolant and inlet and discharge openings on the periphery of the pump housing, no resulting forces arise on the rotary valve, so that the rotary valve requires low actuating and holding forces. In addition, only low pressure drops occur in the servo valve according to the present invention, while actuation speeds are high.
The axial opening in the rotary valve is used for supplying coolant to its interior when the rotary valve is located on the pressure side of the pump device. In this case, the openings located on the peripheral wall of the pump housing represent outlet openings for forwarding the coolant.
Conversely, if the rotary valve is located on the suction side of the pump device, the coolant is discharged via the axial opening to the suction side of the pump, and the pump is fed via the control opening by the openings located on the peripheral wall of the pump housing.
When a simple temperature expansion element is used, such as a wax cartridge, as a drive for the rotary valve, two partial circuits are provided in the peripheral wall of the pump housing: the first partial circuit for the cooler line and the second for the cooling water bypass line during the warm-up phase.
When a servo motor is used for the rotary valve, a plurality of partial circuits with the respective inlet and discharge openings in the peripheral wall of the pump housing may be provided. In one possible embodiment, an additional partial circuit for a bypass line and a third partial circuit for a heat exchanger of a heating circuit are provided in addition to the partial circuit for the cooler line.
As an alternative or in combination, a partial circuit may also be provided for an additional heating system and/or an exhaust gas heat exchanging device.
REFERENCES:
patent: 2288017 (1942-06-01), Neuland
patent: 2352203 (1944-06-01), Johnson
patent: 4644909 (1987-02-01), Nishikata et al.
patent: 5095855 (1992-03-01), Fukuda et al.
patent: 5529026 (1996-06-01), Kurr et al.
patent: 5617815 (1997-04-01), Spies et al.
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patent: 44 16 039 (1995-08-01), None
patent: 44 38 552 (1996-03-01), None
patent: 196 35 044 (1997-03-01), None
patent: 2 667 020 (1992-03-01), None
patent: 1 156 169 (1969-06-01), None
patent: 2 128 318 (1984-04-01), None
patent: 58-110808 (1983-07-01), None
patent: 58-121379 (1983-07-01), None
patent: 1-85419 (1989-06-01), None
patent: 8-200069 (1996-08-01), None
Daimler-Chrysler AG
Kenyon & Kenyon
Kwon John
LandOfFree
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