Control valve
A control valve according to the present invention is configured such that when a third opening part, which is an auxiliary opening part, and a third discharge opening, which is an auxiliary connection opening, do not overlap, the third opening part and a continuous discharge opening overlap. Thus, for example, when a flow rate of cooling water for continuous circulation is required, such as during a cold start, cooling water guided through an internal passage is discharged via the continuous discharge opening in addition to cooling water guided from a bypass passage, thereby ensuring a sufficient flow rate of cooling water for continuous circulation.
1. A control valve for a cooling circuit of a prime mover of an automobile, the control valve comprising:
a rotational shaft, a housing, and a valve body, wherein:
the housing includes:
a valve container in which the rotational shaft is inserted, the valve body disposed in the valve container and connected to the rotational shaft;
a primary communication port that is open to the valve container;
a first secondary communication port that is open to the valve container in a radial direction perpendicular to a rotational axis of the rotational shaft; and
a continuous circulation port that is open to the valve container, is different from the first secondary communication port in position with respect to a circumferential direction around the rotational axis, and is positioned so as to overlap with the first secondary communication port in position with respect to an axial direction parallel with the rotational axis, such that cooling water is continuously flowable through the continuous circulation port due to cooperation with the primary communication port; and
the valve body includes:
a primary opening in communication with the primary communication port; and
a first secondary opening that is in communication with the continuous circulation port when the first secondary opening is not in communication with the first secondary communication port depending on a rotational position of the rotational shaft.
2. The control valve as claimed in claim 1 , wherein depending on the rotational position of the rotational shaft, the first secondary opening is in communication with the first secondary communication port and is not in communication with the continuous circulation port.
3. The control valve as claimed in claim 1 , wherein the continuous circulation port has a shape of an oval elongated in the circumferential direction.
4. The control valve as claimed in claim 3 , wherein in the axial direction, the continuous circulation port is positioned at a center of the first secondary opening.
5. The control valve as claimed in claim 1 , wherein:
the valve body includes an axial first end and an axial second end with respect to the axial direction;
the rotational shaft is connected to the axial first end of the valve body;
the primary opening is open at the axial second end of the valve body;
the first secondary opening is open in the radial direction; and
the continuous circulation port is positioned closer to the primary opening in the axial direction than a center of the first secondary opening.
6. The control valve as claimed in claim 1 , wherein the first secondary opening is greater in opening area than the continuous circulation port.
7. The control valve as claimed in claim 1 , wherein the first secondary communication port is connected to at least one of a radiator, a heater, and an oil cooler.
8. The control valve as claimed in claim 7 , wherein the first secondary communication port is connected to the radiator.
9. The control valve as claimed in claim 8 , wherein:
the valve body includes an axial first end and an axial second end with respect to the axial direction;
the rotational shaft is connected to the axial first end of the valve body;
the primary opening is open at the axial second end of the valve body;
the first secondary opening is open in the radial direction;
the housing includes a primary-communication-port-side secondary communication port positioned closer to the primary communication port in the axial direction than the first secondary communication port; and
the valve body includes a primary-communication-port-side secondary opening that in in communication with the primary-communication-port-side secondary communication port depending on the rotational position of the rotational shaft.
10. The control valve as claimed in claim 9 , wherein:
the housing includes a rotational-shaft-side secondary communication port positioned closer to the rotational shaft in the axial direction than the first secondary communication port; and
the valve body includes a rotational-shaft-side secondary opening that is in communication with the rotational-shaft-side secondary communication port depending on the rotational position of the rotational shaft.
11. The control valve as claimed in claim 10 , wherein:
the primary-communication-port-side secondary communication port is connected to the oil cooler;
the first secondary communication port is connected to the radiator; and
the rotational-shaft-side secondary communication port is connected to the heater.
12. The control valve as claimed in claim 10 , wherein:
the control valve is structured to be in a first state, a second state, a third state, a fourth state, or a fifth state, depending on the rotational position of the rotational shaft;
in the first state, the first secondary communication port is in communication with the first secondary opening, the rotational-shaft-side secondary communication port is not in communication with the rotational-shaft-side secondary opening, the continuous circulation port is not in communication with the first secondary opening, and the primary-communication-port-side secondary communication port is not in communication with the primary-communication-port-side secondary opening;
in the second state, the primary-communication-port-side secondary communication port is in communication with the primary-communication-port-side secondary opening, the first secondary communication port is not in communication with the first secondary opening, the continuous circulation port is not in communication with the first secondary opening, and the rotational-shaft-side secondary communication port is not in communication with the rotational-shaft-side secondary opening;
in the third state, the continuous circulation port is in communication with the first secondary opening, the rotational-shaft-side secondary communication port is not in communication with the rotational-shaft-side secondary opening, the first secondary communication port is not in communication with the first secondary opening, and the primary-communication-port-side secondary communication port is not in communication with the primary-port-side secondary opening;
in the fourth state, the rotational-shaft-side secondary communication port is in communication with the rotational-shaft-side secondary opening, the primary-communication-port-side secondary communication port is in communication with the primary-communication-port-side secondary opening, the first secondary communication port is not in communication with the first secondary opening, and the continuous circulation port is not in communication with the first secondary opening; and
in the fifth state, the first secondary communication port is in communication with the first secondary opening, the rotational-shaft-side secondary communication port is in communication with the rotational-shaft-side secondary opening, the continuous circulation port is not in communication with the first secondary opening, and the primary-communication-port-side secondary communication port is not in communication with the primary-communication-port-side secondary opening.
13. The control valve as claimed in claim 1 , wherein:
the valve body includes a spherical part; and
the first secondary opening is formed in the spherical part.
14. The control valve as claimed in claim 1 , wherein:
the housing includes a plurality of secondary communication ports open to the valve container in the radial direction, wherein the plurality of the secondary communication ports includes the first secondary communication port; and
the valve body includes a plurality of secondary openings, each of which is in communication with a corresponding one of the plurality of the secondary communication ports depending on the rotational position of the rotational shaft, wherein the plurality of the secondary openings includes the first secondary opening.