Flow rate-controlling valve

1. A flow rate-controlling valve, comprising:

a housing having

a main communication port for introduction or discharge of cooling water, which is provided at a substantially cylindrical valve body accommodating portion; and

first to third communication ports which communicate with the valve body accommodating portion from a radial direction to introduce or discharge the cooling water into or from the valve body accommodating portion;

a substantially cylindrical valve body rotatably supported in the housing, the valve body having first to third opening portions whose overlap states with the respective first to third communication ports are changed according to a rotation position of the valve body; and

an actuator controlling the rotation position of the valve body, and

the first and second opening portions being arranged parallel in a rotation axial direction on an outer peripheral surface of the valve body,

the third opening portion being arranged in a different circumferential direction position from the first or second opening portion on the outer peripheral surface of the valve body so that at least a part of the third opening portion overlaps with the first or second opening portion in the rotation axial direction, and

a third axial direction position that is a same axial direction center as the third opening portion is set between a first axial direction position that is a same axial direction center as the first opening portion and a second axial direction position that is a same axial direction center as the second opening portion in the rotation axial direction.

2. The flow rate-controlling valve as claimed in claim 1 , wherein:

the third opening portion is provided at a first opening portion side in the rotation axial direction.

3. The flow rate-controlling valve as claimed in claim 1 , wherein:

the first to third opening portions are formed by a circular hole, and a maximum opening area of the third opening portion is set to be larger than those of the first and second opening portions.

4. The flow rate-controlling valve as claimed in claim 3 , wherein:

the third opening portion is connected to a radiator.

5. The flow rate-controlling valve as claimed in claim 1 , wherein:

a peripheral region of each of the first to third opening portions of the valve body is formed into a spherical shape.

6. The flow rate-controlling valve as claimed in claim 5 , wherein:

the curvature of each of the spherical peripheral regions of the first to third opening portions of the valve body are substantially equal.

7. The flow rate-controlling valve as claimed in claim 5 , wherein:

the radii of rotation of each of the spherical peripheral regions of the first to third opening portions are substantially equal.

8. The flow rate-controlling valve as claimed in claim 5 , wherein:

an opening edge of each of the communication ports is liquid-tightly sealed by a circular seal member.

9. The flow rate-controlling valve as claimed in claim 1 , wherein:

the actuator is an electric motor.

10. A flow rate-controlling valve comprising:

a housing having

an introduction port which introduces cooling water into a substantially cylindrical valve body accommodating portion; and

first to third outlet ports, each of which communicates with an externally-connecting pipe and delivers the cooling water from the valve body accommodating portion;

a substantially cylindrical valve body rotatably supported in the housing, the valve body having first to third opening portions whose overlap states with the respective first to third outlet ports are changed according to a rotation position of the valve body; and

an actuator controlling the rotation position of the valve body, and

the first and second opening portions being arranged parallel in an axial direction on an outer peripheral surface of the valve body, and

the third opening portion being arranged in a different circumferential direction position from the first or second opening portion on the outer peripheral surface of the valve body so that at least a part of the third opening portion overlaps with the first or second opening portion in the axial direction.

11. The flow rate-controlling valve as claimed in claim 10 , wherein:

a maximum opening area of the third opening portion to the third outlet port is set to be larger than those of the first and second opening portions to the first and second outlet ports.

12. The flow rate-controlling valve as claimed in claim 11 , wherein:

at least the third outlet port is provided on an opposite side to the first and second outlet ports with respect to an axis center of the valve body.

13. The flow rate-controlling valve as claimed in claim 11 , wherein:

the first opening portion communicates with the outlet port that is connected to one of an oil cooler and a heater heat exchanger, and the second opening portion communicates with the outlet port that is connected to the other of the oil cooler and the heater heat exchanger, and

the third opening portion communicates with the outlet port that is connected to a radiator.

14. The flow rate-controlling valve as claimed in claim 13 , wherein:

the maximum opening area of the second opening portion to the second outlet port is set to be larger than that of the first opening portion to the first outlet port.

15. The flow rate-controlling valve as claimed in claim 10 , wherein:

the first opening portion communicates with the outlet port that is connected to an oil cooler, and

the second opening portion communicates with the outlet port that is connected to a heater heat exchanger.

16. The flow rate-controlling valve as claimed in claim 10 , wherein:

the valve body is provided, at an axial direction one end side thereof, with an inflow port into which the cooling water flows from the introduction port, and the other end side of the valve body is closed.

17. The flow rate-controlling valve as claimed in claim 10 , wherein:

the flow rate-controlling valve has following operating states;

a first state in which only the second opening portion communicates with the second outlet port and the first and third opening portions are in a non-communication state with the first and third outlet ports respectively;

a second state in which all of the first to third opening portions are in the non-communication state with the first to third outlet ports respectively;

a third state in which only the first opening portion communicates with the first outlet port and the second and third opening portions are in the non-communication state with the second and third outlet ports respectively;

a fourth state in which the first and second opening portions communicate with the first and second outlet ports respectively and only the third opening portion is in the non-communication state with the third outlet port; and

a fifth state in which all of the first to third opening portions communicate with the first to third outlet ports respectively.

18. The flow rate-controlling valve as claimed in claim 17 , wherein:

the first to fifth states are continuously shifted according to rotation of the valve body.

19. The flow rate-controlling valve as claimed in claim 17 , wherein:

after the first state is shifted to the second state, the second state is shifted to the third state, and after the third state is shifted to the fourth state, the fourth state is shifted to the fifth state.

20. A flow rate-controlling valve, comprising:

a housing having

an introduction port that introduces fluid into a substantially cylindrical valve body accommodating portion; and

first to third discharge ports that communicate with the valve body accommodating portion from a radial direction and discharge the fluid from the valve body accommodating portion;

a substantially cylindrical valve body rotatably supported in the housing, the valve body having first to third opening portions whose overlap states with the respective first to third discharge ports are changed according to a rotation position of the valve body; and

an actuator controlling the rotation position of the valve body, and

the first and second opening portions being arranged parallel in an axial direction on an outer peripheral surface of the valve body, and

the third opening portion being arranged in a different circumferential direction position from the first or second opening portion on the outer peripheral surface of the valve body so that at least a part of the third opening portion overlaps with the first or second opening portion in the axial direction.