# US 9,518,503 B2 · Cooling water control valve apparatus

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- Number: US 9,518,503 B2
- Document ID: US9518503B2
- Status: Granted
- Kind: B2
- Application number: 13/774,040
- Filed: 2013-02-22
- Published: 2013-08-29
- Granted: 2016-12-13
- Earliest claimed: 2012-02-28
- Applicants: Toru Tsuchiya; Takumi Oikawa; Masayuki Daikuhara; Hiromasa Ogawa; Masaki Teshi
- Inventors: Toru Tsuchiya; Takumi Oikawa; Masayuki Daikuhara; Hiromasa Ogawa; Masaki Teshi
- Web page: https://patentgrep.com/patent/US9518503B2

## CPC

- F01P 7/14: the coolant being liquid
- F01P 7/16: by thermostatic control
- G05D 23/134: {measuring the temperature of mixed fluid}
- F01P 11/16: concerning coolant temperature (F01P11/20 takes precedence)
- F01P 11/18: concerning coolant pressure, coolant flow, or liquid-coolant level
- F01P 2003/027: {Cooling cylinders and cylinder heads in parallel}
- F01P 2060/045: for transmissions
- F01P 2060/18: Heater
- F01P: COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES (arrangements in connection with cooling of propulsion units in vehicles B60K11/00; heat-transfer, heat-exchange or heat-storage materials C09K5/00; {cooling of gas-turbine engines F02C7/12}; heat exchange in general, radiators F28)
- G05D: SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES

## Abstract

A cooling water control valve apparatus capable of independently controlling flow rates of cooling water in two lines with a single apparatus for cooling water control and capable of achieving cost reduction. A cooling water control valve apparatus which adjusts a flow rate of cooling water for cooling an object to be cooled includes two inlet ports through which cooling water is introduced, an electrical control valve which is arranged at a first passage communicated with one of the inlet ports and which adjusts a flow rate of cooling water flowing through the first passage with electronic control, and a thermosensitive valve which is arranged at a second passage communicated with the other of inlet ports and which adjusts a flow rate of cooing water flowing through the second passage owing to displacement of a temperature detecting medium with temperature.

## Claims

### Claim 1

A cooling water control valve apparatus which adjusts a flow rate of cooling water for an engine cooling system which includes a water jacket at a cylinder head side of the engine, a water jacket at a cylinder block side of the engine, a circulation flow passage through which cooling water is circulated from the water jackets toward a radiator, a bypass flow passage to return cooling water outflowing from the water jacket at the cylinder head side of the engine to the water jacket at the cylinder head side and/or the water jacket at the cylinder block side as bypassing the radiator, comprising:
a casing including a first inlet port, a second inlet port, a first passage communicated with the first inlet port, a second passage communicated with the second inlet port, a main outlet portion communicated with the first passage and the second passage, and a bypass outlet portion branches from the first passage, and a partition wall partitioning the first passage and the second passage;
an electrical control valve which is arranged in the first passage and which adjusts a flow rate of cooling water flowing through the first passage with electronic control, wherein the bypass outlet portion is arranged at the casing so as to branch from the first passage at a position located on a first inlet port side of the electrical control valve such that cooling water flows in the first passage when the electrical control valve is closed; and
a thermosensitive valve which is arranged in the second passage which adjusts a flow rate of cooing water flowing through the second passage owing to displacement of a temperature detecting medium with temperature,
wherein the casing further includes a return flow passage disposed in the partition wall to provide continuous communication between the first passage and the second passage such that cooling water flows from the second passage to the first passage when the thermosensitive valve is closed, the return flow passage is connected to the second passage at a position located on a second inlet port side of the thermosensitive valve such that cooling water flows from the second passage to the first passage, flows in the first passage and to the bypass outlet portion when the thermosensitive valve and the electric control valve are both closed.

### Claim 2 (depends on 1)

The cooling water control valve apparatus according to claim 1, comprising a check valve which is disposed in the partition wall and provides communication between the first passage at the first inlet port side of the electrical control valve and the second passage at the second inlet port side of the thermosensitive valve and which allows cooling water to flow from the first passage to the second passage when the electric control valve is kept in a closed state with a defect thereof.