JP6887872B2 - Control valve - Google Patents

Description

The present invention relates to a control valve.

In a cooling system that cools an engine using cooling water, a bypass flow path that bypasses the radiator, a warm-up flow path that passes through an oil warmer, etc. are provided in addition to the radiator flow path that circulates between the radiator and the engine. May be. Such a cooling system is provided with a control valve for controlling the flow of cooling water to a radiator flow path, a bypass flow path, a warm-up flow path, or the like (see, for example, Patent Document 1 below).
According to this configuration, by switching the flow of the cooling water according to the cooling water temperature or the like, fuel efficiency is improved by early temperature rise, high water temperature (optimum temperature) control, or the like.

The control valve described above includes a tubular casing having an inflow port for cooling water, and a tubular valve body arranged coaxially with the casing in the casing and configured to be rotatable around the axis. It is known (see, for example, Patent Document 2 below).
The casing is formed with an outlet that penetrates the casing in the radial direction. A plurality of outlets are formed at intervals in the axial direction of the casing.
Inside the valve body, a flow passage through which the cooling water flowing into the casing flows in the axial direction is formed. The valve body is formed with a plurality of communication ports that separately communicate the flow passage and each of the above-mentioned outlets according to the rotation of the valve body.

According to this configuration, by rotating the valve body, communication and blocking between the outlet and the communication port can be switched. Then, the cooling water that has flowed into the control valve flows out of the control valve through the outlet that is in communication with the communication port in the process of flowing through the flow passage. As a result, the cooling water that has flowed into the control valve is distributed to one or more flow paths according to the rotation of the valve body.

Japanese Unexamined Patent Publication No. 2015-121207 Japanese Unexamined Patent Publication No. 2015-218852

By the way, in the control valve, when an abnormality occurs, for example, a fail opening for supplying cooling water to the radiator flow path may be formed in the casing. In this case, the fail opening can be opened and closed by a thermostat. According to this configuration, when the cooling water temperature exceeds a predetermined temperature, the thermostat opens the fail opening regardless of the rotation position of the valve body.
However, depending on the mounting position of the thermostat in the casing, it is not possible to effectively apply the cooling water to the thermostat, and there is a problem that the temperature sensing performance (responsiveness) of the thermostat is poor.

Therefore, the present invention has been made in consideration of the above-mentioned circumstances, and an object of the present invention is to provide a control valve capable of improving the temperature sensing performance of a thermostat.

In order to solve the above problems, the present invention has adopted the following aspects.
The control valve according to one aspect of the present invention is housed in a tubular casing having a fluid inlet and a first outlet, and in the casing rotatably around an axis extending in the axial direction of the casing. A valve body having a flow passage communicating with the inlet and flowing a fluid is provided, and the valve body has a first communication communicating with the flow passage and the first outlet according to the rotation position of the valve body. mouth is formed, of the casing, the portion opposed to the inlet in the opening direction of the inlet, the thermostat is arranged and are connected via switchable fail open by the thermostat is formed, the A second outlet that opens in a direction intersecting the opening direction of the fail opening is formed in a portion of the casing adjacent to the fail opening .

According to this aspect, since the thermostat is arranged in the portion of the casing facing the inflow port in the opening direction of the inflow port, the fluid flowing into the casing can be effectively applied to the thermostat. .. As a result, the temperature sensing performance of the thermostat can be improved. As a result, the fail opening can be quickly opened and closed according to the fluid temperature regardless of the rotational position of the valve body (regardless of the communication state between the first outlet and the first communication port).

Further , the fluid flowing into the casing through the inflow port hits the thermostat and then flows out to the outside of the casing through the second outflow port. Therefore, since a flow toward the second outlet can be created around the thermostat in the casing, it is possible to suppress the formation of a stagnation point around the thermostat. Therefore, the temperature sensing performance of the thermostat can be further improved.

In the above aspect, the casing has a bottomed tubular casing body and a lid that closes an opening of the casing body, and the fail opening is the axial lid in the casing body. The second outlet penetrates the portion located closer in the radial direction, the second outlet penetrates the lid in the axial direction, and the lid includes a heat exchanger arranged outside the casing and the heat exchanger. It is preferable that the first joint connecting between the second outlet and the second outlet is integrally formed.
According to this aspect, since the connecting pipe connecting the heat exchanger and the control valve is integrally formed with the lid, when the connecting pipe is attached to the casing body or the lid separately (welding, etc.). Compared with the above, the number of parts can be reduced and the mounting process can be reduced.

In the above aspect, the valve body defines the flow passage between the rotating shaft rotatably supported by the casing and the rotating shaft surrounding a part of the rotating shaft in the axial direction. , A valve cylinder portion having the first communication port formed therein, and a position in the casing avoiding the valve cylinder portion in the axial direction is a connecting flow that communicates the inflow port and the flow passage. It is preferable that the path is formed and the second outlet is directly connected to the connecting flow path.
According to this aspect, the fluid flowing out from the second outlet flows into the connecting flow path and then flows into the second outlet without passing through the flow path. That is, the fluid always flows into the second outlet regardless of the rotational position of the valve body. As a result, for example, when the communication between the first outlet and the first communication port is cut off (when the valve body is fully closed), the flow of fluid from the connecting flow path to the flow path is weakened. Therefore, when the valve body is fully closed, the contamination that has entered the casing can be suppressed from flowing toward the valve body, and the contamination can be positively discharged from the second outlet. As a result, it is possible to prevent contamination from being caught between the outer peripheral surface of the valve body and the inner peripheral surface of the casing and hindering the rotation of the valve body.

The control valve according to one aspect of the present invention is housed in a tubular casing having a fluid inlet and a first outlet, and in the casing rotatably around an axis extending in the axial direction of the casing. A valve body having a flow passage for flowing fluid through the inlet is provided, and the valve body has a first communication that communicates with the flow passage and the first outlet according to the rotation position of the valve body. mouth is formed, of the casing, the portion opposed to the inlet in the opening direction of the inlet, the thermostat is arranged and are connected via switchable fail open by the thermostat is formed, the The valve body defines the flow passage between the rotating shaft whose both ends in the axial direction are rotatably supported by the casing via bearings and the rotating shaft surrounding the rotating shaft. A seal ring is provided between a portion of the casing having a valve cylinder portion on which the first communication port is formed and located inside the bearing in the axial direction and the rotating shaft. Is arranged, and the casing is formed with an air-opening portion that opens a portion located outside the seal ring in the axial direction to the atmosphere .
According to this aspect, since both ends of the rotating shaft in the axial direction are open to the atmosphere, no differential pressure is generated in the pressure acting on both ends of the rotating shaft. Therefore, the axial load acting on the rotating shaft is evenly compared with the case where the pressure acting on both ends of the rotating shaft is different, for example, in a configuration in which one end of the rotating shaft is arranged in the cooling water. Easy to set. As a result, it is possible to prevent the rotating shaft from being pressed against the low pressure side in the axial direction.

The control valve according to one aspect of the present invention is housed in a tubular casing having a fluid inlet and a first outlet, and in the casing rotatably around an axis extending in the axial direction of the casing. A valve body having a flow passage communicating with the inlet and flowing a fluid is provided, and the valve body has a first communication communicating with the flow passage and the first outlet according to the rotation position of the valve body. mouth is formed, of the casing, the portion opposed to the inlet in the opening direction of the inlet, the thermostat is arranged and are connected via switchable fail open by the thermostat is formed, the The first outlet and the fail opening are formed side by side with the casing, and the outer surface of the casing surrounds the first outlet and the fail opening and is grouped into the first outlet and the fail opening. The second joint that communicates with the new joint has a welded portion .
According to this aspect, since the joints communicate with the first outlet and the fail opening collectively, the number of parts is reduced and the welding process is reduced as compared with the case where separate joints are welded to the first outlet and the fail opening. Can be planned. Further, as compared with the case where separate joints are welded to the first outlet and the fail opening, the welding allowance of the joint located between the first outlet and the fail opening can be reduced. As a result, it is possible to reduce the size of the control valve in the arrangement direction of the first outlet and the fail opening.
Moreover, in this embodiment, since the outlet is formed at a position facing the fail opening, the opening end surface of the outlet can function as a seating surface at the time of joint welding. As a result, the welding work can be performed efficiently.

In the above aspect, the second joint may be connected to the radiator of the vehicle.
According to this aspect, when the fluid reaches a predetermined temperature or higher, the fluid can be supplied to the radiator through the fail opening, so that the temperature of the fluid can be quickly lowered to less than the predetermined temperature.

According to one aspect of the present invention, the temperature sensing performance of the thermostat can be improved.

It is a block diagram of the cooling system which concerns on embodiment. It is a perspective view of the control valve which concerns on 1st Embodiment. It is an exploded perspective view of the control valve which concerns on 1st Embodiment. FIG. 5 is a front view of the control valve according to the first embodiment as viewed from the second end side in the axial direction with the lid removed. It is sectional drawing which follows the VV line of FIG. It is sectional drawing corresponding to the VI-VI line of FIG. FIG. 5 is a cross-sectional view taken along the line VII-VII of FIG. It is a perspective view which looked at the valve body which concerns on 1st Embodiment from the 2nd end side in the axial direction. It is a development view of the valve cylinder part which concerns on 1st Embodiment. It is a development view of the valve cylinder part which concerns on 1st Embodiment. It is an enlarged sectional view which shows the 1st end side in the axial direction in the control valve which concerns on 2nd Embodiment. It is an enlarged sectional view which shows the 2nd end side in the axial direction in the control valve which concerns on 2nd Embodiment.

Next, an embodiment of the present invention will be described with reference to the drawings. In the following description, a case where the control valve of the present embodiment is adopted as a cooling system for cooling the engine using cooling water will be described.

[Cooling system]
FIG. 1 is a block diagram of the cooling system 1.
As shown in FIG. 1, the cooling system 1 is mounted on a vehicle having at least an engine as a vehicle drive source. The vehicle may be a hybrid vehicle, a plug-in hybrid vehicle, or the like, in addition to a vehicle having only an engine.

The cooling system 1 includes an engine 2 (ENG), a water pump 3 (W / P), a radiator 4 (RAD), an oil warmer 5 (O / W), a heater core 6 (HTR), an EGR cooler 7 (EGR), and a control valve. 8 (EWV) is connected by various flow paths 10 to 15.
The water pump 3, the engine 2, and the control valve 8 are connected in order from upstream to downstream on the main flow path 10. In the main flow path 10, the cooling water passes through the engine 2 and the control valve 8 in order by the operation of the water pump 3.
A radiator flow path 11, a bypass flow path 12, a warm-up flow path 13, an air conditioning flow path 14, and an EGR flow path 15 are connected to the main flow path 10, respectively. The radiator flow path 11, the bypass flow path 12, the warm-up flow path 13, the air conditioning flow path 14, and the EGR flow path 15 connect the upstream portion of the water pump 3 and the control valve 8 of the main flow path 10. ..

The radiator 4 is connected to the radiator flow path 11. In the radiator flow path 11, heat exchange between the cooling water and the outside air is performed in the radiator 4.
The bypass flow path 12 is a flow path that bypasses the radiator 4.

An oil warmer 5 is connected to the warm-up flow path 13. Engine oil circulates between the oil warmer 5 and the engine 2 through the oil flow path 18. In the warm-up flow path 13, heat exchange between the cooling water and the engine oil is performed in the oil warmer 5. In this embodiment, the heat exchanger is used as the "oil warmer 5" from the viewpoint of improving fuel efficiency and early warming up, but the oil temperature may be higher than the water temperature depending on the operating conditions. In that case, it is natural to use the heat exchanger as an "oil cooler".

A heater core 6 is connected to the air conditioning flow path 14. The heater core 6 is provided, for example, in a duct (not shown) of an air conditioner. In the air conditioning flow path 14, heat exchange between the cooling water and the air conditioning air flowing in the duct is performed in the heater core 6.
An EGR cooler 7 is connected to the EGR flow path 15. In the EGR flow path 15, heat exchange between the cooling water and the EGR gas is performed in the EGR cooler 7. In addition to the EGR cooler 7, an EGR valve, a turbocharger, a throttle, and the like are connected in series to the EGR flow path 15, and heat exchange is performed in each device, so that the EGR flow path 15 is called a heat exchanger.

In the cooling system 1 described above, the cooling water that has passed through the engine 2 in the main flow path 10 flows into the control valve 8 and then is selectively distributed to the various flow paths 11 to 15 by the operation of the control valve 8. As a result, early temperature rise and high water temperature (optimal temperature) control can be realized, and the fuel efficiency of the vehicle is improved.

(First Embodiment)
<Control valve>
FIG. 2 is a perspective view of the control valve 8. FIG. 3 is an exploded perspective view of the control valve 8.
As shown in FIGS. 2 and 3, the control valve 8 mainly includes a casing 21, a valve body 22, and a drive unit 23.

(casing)
The casing 21 has a bottomed tubular casing main body 25 and a lid 26 that closes the opening of the casing main body 25. In the following description, the direction along the axis O of the casing 21 is simply referred to as the axial direction. Further, the direction toward the bottom wall portion 32 of the casing main body 25 with respect to the peripheral wall portion 31 of the casing main body 25 is referred to as the first end side, and the direction toward the lid 26 with respect to the peripheral wall portion 31 of the casing main body 25 is referred to as the second end side. It is called the end side. Further, the direction orthogonal to the axis O is called the radial direction, and the direction around the axis O is called the circumferential direction. In the present embodiment, the surface area of the peripheral wall portion 31 is larger than the surface area of the bottom wall portion 32 and the lid 26. That is, the casing 21 is formed in a tubular shape that is long in the axial direction.

FIG. 4 is a front view of the control valve 8 as viewed from the second end side in the axial direction with the lid body 26 removed.
As shown in FIG. 4, the casing body 25 and the lid 26 are made of, for example, a resin material.
Mounting pieces (first mounting piece 33 and second mounting piece 34) are formed on the peripheral wall portion 31 of the casing main body 25. The mounting pieces 33 and 34 project from the peripheral wall portion 31 to the outside in the radial direction. The mounting pieces 33 and 34 are formed at positions of the peripheral wall portion 31 that face each other in the radial direction with the axis O interposed therebetween. In the present embodiment, the first mounting piece 33 is located at both ends in the axial direction of the peripheral wall portion 31 (see FIG. 7). As shown in FIG. 2, the second mounting piece 34 is located on the first end side of the peripheral wall portion 31 with respect to the central portion in the axial direction. Then, the control valve 8 is fixed in the engine room via, for example, the mounting pieces 33 and 34. The positions and numbers of the mounting pieces 33 and 34 can be changed as appropriate.

FIG. 5 is a cross-sectional view taken along the line VV of FIG.
As shown in FIGS. 4 and 5, an inflow port 37 that bulges outward in the radial direction is formed in a portion of the peripheral wall portion 31 on the first end side in the axial direction. The inflow port 37 is formed in the peripheral wall portion 31 at a position displaced by, for example, 90 ° in the circumferential direction with respect to the mounting pieces 33 and 34 described above. The inflow port 37 is formed with an inflow port 37a that penetrates the inflow port 37 in the radial direction. The inflow port 37a communicates with the inside and outside of the casing 21.

The above-mentioned main flow path 10 (see FIG. 2) is connected to the open end face (outer end face in the radial direction) of the inflow port 37 with an O-ring 38 (see FIG. 3) interposed therebetween. The opening end surface of the inflow port 37 is a flat surface orthogonal to the radial direction.

As shown in FIG. 5, a radiator port 41 that bulges outward in the radial direction is formed at a position of the peripheral wall portion 31 that faces the inflow port 37 in the radial direction with the axis O sandwiched between them. The radiator port 41 is formed in an oval shape with the axial direction as the elongated direction when viewed from the side in the radial direction. The radiator port 41 is formed with a fail opening 41a and a radiator outlet 41b arranged in an axial direction. The fail opening 41a and the radiator outlet 41b each penetrate the radiator port 41 in the radial direction. In the present embodiment, the fail opening 41a faces the above-mentioned inflow port 37a in the radial direction. Further, the radiator outlet 41b is located on the second end side in the axial direction with respect to the fail opening 41a. The inner diameters of the fail opening 41a and the radiator outlet 41b are formed to be the same.

The open end surface (outer end surface in the radial direction) of the radiator port 41 is a flat surface orthogonal to the radial direction. Therefore, the open end face of the radiator port 41 and the open end face of the inflow port 37 described above extend in parallel with each other. However, as long as the radiator port 41 and the inflow port 37 are arranged at positions facing each other in the radial direction, the open end surface of the radiator port 41 and the open end surface of the inflow port 37 may be arranged at a slight inclination. Absent.

Further, a radiator joint (second joint) 42 is connected to the open end surface (outer end surface in the radial direction) of the radiator port 41. The radiator joint 42 connects the radiator port 41 and the radiator flow path 11 (see FIG. 1). The radiator joint 42 has a flange portion 43 and a radiator supply pipe 44.

The flange portion 43 has an oval shape formed in the same shape as the open end surface of the radiator port 41. That is, the flange portion 43 surrounds the fail opening 41a and the radiator outlet 41b. The flange portion 43 is welded (for example, vibration welding) to the open end surface of the radiator port 41. That is, the open end surface of the radiator port 41 and the inner end surface in the radial direction of the flange portion 43 are each welded surfaces.

The radiator supply pipe 44 extends radially outward from the flange portion 43 and then extends toward the second end side in the axial direction. Specifically, the radiator supply pipe 44 includes a fail communication portion 44a, a radiator communication portion 44b, and a merging portion 44c.
The fail communication portion 44a extends radially outward from a position of the flange portion 43 that overlaps with the fail opening 41a when viewed from the radial direction. The inside of the fail communication portion 44a can communicate with the fail opening 41a.
The radiator communication portion 44b extends outward in the radial direction from a position of the flange portion 43 that overlaps with the radiator outlet 41b when viewed in the radial direction. The inside of the radiator communication portion 44b communicates with the radiator outlet 41b.

The merging portion 44c extends in the axial direction. The portion of the merging portion 44c on the first end side in the axial direction is collectively connected to the outer end portion in the radial direction of the communicating portions 44a and 44b. The upstream end portion of the radiator flow path 11 (see FIG. 1) described above is connected to the portion on the second end side in the axial direction of the merging portion 44c. The radiator supply pipe 44 may be collectively communicated with the fail opening 41a and the radiator outlet 41b as long as the welding area between the radiator port 41 and the flange portion 43 is secured.

A thermostat 45 is provided in the fail opening 41a. The thermostat 45 opens and closes the fail opening 41a according to the temperature of the cooling water flowing in the casing 21. The thermostat 45 opens the fail opening 41a when the cooling water temperature is equal to or higher than a predetermined temperature, and communicates the fail opening 41a with the inside of the fail communicating portion 44a. In this embodiment, for example, a wax pellet type is used for the thermostat 45. That is, the thermostat 45 operates the valve body by utilizing the thermal expansion of the wax filled inside the thermostat. In the thermostat 45, the fail opening 41a is closed by the valve body because the mounting flange portion is sandwiched between the opening end surface of the radiator port 41 and the flange portion 43. In this case, the thermo element of the thermostat 45 is radially opposed to the above-mentioned inflow port 37a in the casing 21. In the present embodiment, the configuration in which the fail opening 41a and the inflow port 37a are arranged coaxially has been described, but the present invention is not limited to this configuration, and at least one of the fail opening 41a and the inflow port 37a when viewed from the radial direction. It doesn't matter if the parts overlap.

FIG. 6 is a cross-sectional view corresponding to the VI-VI line of FIG.
As shown in FIG. 6, the EGR port 51 is formed in the radiator port 41 at a position equivalent to the fail opening 41a described above in the axial direction. The EGR port 51 bulges in a direction orthogonal to the opening direction of the fail opening 41a (the same direction as the first mounting piece 33). The EGR port 51 is formed with an EGR outlet 51a that communicates with the radiator port 41 (fail opening 41a). The EGR outlet 51a extends in the bulging direction of the EGR port 51 (the direction orthogonal to the opening direction of the fail opening 41a). The opening direction of the EGR outlet 51a may be a direction intersecting the opening direction of the fail opening 41a (a direction different from the opening direction of the fail opening 41a). Further, the EGR port 51 (EGR outlet 51a) may be positioned axially deviated from the fail opening 41a as long as it is adjacent to the fail opening 41a.

An EGR joint 52 is connected to the open end surface of the EGR port 51. The EGR joint 52 connects the EGR port 51 and the upstream end of the EGR flow path 15 (see FIG. 1) described above. The EGR joint 52 is welded (for example, vibration welding) to the open end surface of the EGR port 51.

As shown in FIG. 2, of the portion of the peripheral wall portion 31 on the second end side in the axial direction, the portion located between the radiator port 41 and the second mounting piece 34 in the circumferential direction includes the bypass port 55 and the warmth. Machine ports 56 are formed side by side in the axial direction. The ports 55 and 56 are in the radial direction intersecting each other in the bulging direction of the radiator port 41 and the second mounting piece 34 (in the radial direction, the bulging direction of the radiator port 41 and the second mounting piece 34, respectively). It bulges in different directions). A connecting portion 57 for connecting the ports 55 and 56 in the axial direction is formed in a portion of the peripheral wall portion 31 located between the ports 55 and 56. The width of the connecting portion 57 in the circumferential direction is formed to be narrower than that of the ports 55 and 56, and the amount of bulging outward in the radial direction is the same as that of the ports 55 and 56.

FIG. 7 is a cross-sectional view taken along the line VII-VII of FIG.
As shown in FIG. 7, the bypass port 55 is arranged on the first end side in the axial direction with respect to the warm-up port 56. The bypass port 55 is formed with a bypass outlet 55a that penetrates the bypass port 55 in the radial direction. As shown in FIG. 2, a bypass joint 61 is connected to the open end surface (diameter outer end surface) of the bypass port 55. The bypass joint 61 connects the bypass port 55 and the upstream end of the bypass flow path 12 (see FIG. 1) described above. The bypass joint 61 projects radially outward from the open end surface of the bypass port 55. The bypass joint 61 is welded (for example, vibration welding) to the open end surface of the bypass port 55.

As shown in FIG. 7, the warm-up port 56 is formed with a warm-up outlet 56a that penetrates the warm-up port 56 in the radial direction. A warm-up joint 62 is connected to the open end face (outer end face in the radial direction) of the warm-up port 56. As shown in FIG. 2, the warm-up joint 62 connects the warm-up port 56 and the upstream end of the warm-up flow path 13 (see FIG. 1) described above. The warm-up joint 62 projects radially outward from the open end face of the warm-up port 56. The warm-up joint 62 is welded (for example, vibration welding) to the open end surface of the warm-up port 56. The bypass port 55 and the warm-up port 56 may be arranged so as to be offset in the circumferential direction.

As shown in FIG. 4, an air conditioning port 66 is formed in a portion of the peripheral wall portion 31 on the second end side in the axial direction, which is located between the radiator port 41 and the first mounting piece 33 in the circumferential direction. Has been done. The air conditioning port 66 intersects each other in the bulging direction of the radiator port 41 and the first mounting piece 33 in the radial direction (in the radial direction, the bulging direction of the radiator port 41 and the first mounting piece 33, respectively). It bulges in different directions). As shown in FIG. 7, the air conditioning port 66 is formed between the bypass port 55 and the warm-up port 56 described above in the axial direction. In the present embodiment, the central portion in the axial direction of the air conditioning port 66 and the central portion in the axial direction of the connection portion 57 described above are arranged at the same positions in the axial direction. Further, the outer diameter of the air conditioning port 66 is larger than the distance between the bypass outlet 55a and the warm-up outlet 56a in the axial direction.

The air conditioning port 66 is formed with an air conditioning outlet 66a that penetrates the air conditioning port 66 in the radial direction. In the present embodiment, the inner diameter of the air conditioning outlet 66a is equivalent to the axial width (distance between the bypass outlet 55a and the warm-up outlet 56a) of the connection portion 57 described above. However, the inner diameter of the air conditioning outlet 66a can be changed as appropriate.

As shown in FIG. 4, the air conditioning joint 68 is connected to the open end surface (outer end surface in the radial direction) of the air conditioning port 66. The air conditioning joint 68 connects the air conditioning port 66 and the upstream end of the air conditioning flow path 14 (see FIG. 1) described above. The air conditioning joint 68 projects radially outward from the open end face of the air conditioning port 66. The air conditioning joint 68 is welded (for example, vibration welding) to the open end surface of the air conditioning port 66.

(Drive unit)
As shown in FIG. 2, the drive unit 23 is attached to the bottom wall portion 32 of the casing main body 25. The drive unit 23 is configured such that a motor, a speed reduction mechanism, a control board, and the like (not shown) are housed in the drive case 71.

(Valve body)
As shown in FIGS. 3 and 4, the valve body 22 is housed in the casing 21. The valve body 22 is formed in a cylindrical shape arranged coaxially with the axis O of the casing 21. The valve body 22 opens and closes each of the above-mentioned outlets (radiator outlet 41b, bypass outlet 55a, warm-up outlet 56a, and air conditioning outlet 66a) by rotating around the axis O. The valve body 22 is made of, for example, a resin material.

The valve body 22 mainly has a rotating shaft 81, a hollow cylindrical valve cylinder portion 82 surrounding the rotating shaft 81, and spoke portions 83 to 85 connecting the rotating shaft 81 and the valve cylinder portion 82. ing.

As shown in FIG. 5, the rotating shaft 81 extends coaxially with the axis O. The portion of the rotating shaft 81 on the first end side is rotatably supported by the first bush 88 provided on the bottom wall portion 32 described above. The first bush 88 is fitted in a through hole 32a that penetrates the bottom wall portion 32 in the axial direction. The portion of the rotating shaft 81 on the first end side penetrates the bottom wall portion 32 in the axial direction through the through hole 32a. The portion of the rotating shaft 81 on the first end side is connected to the drive unit 23 described above outside the casing 21. As a result, the power of the drive unit 23 is transmitted to the rotating shaft 81. As shown in FIG. 3, in the portion of the rotating shaft 81 on the first end side, the portion located on the second end side in the axial direction with respect to the above-mentioned first bush 88 is the inner surface of the through hole 32a. A seal ring 89 that seals between the rotating shaft 81 and the outer peripheral surface thereof is interposed.
The portion of the rotating shaft 81 on the second end side is rotatably supported by the second bush 91 provided on the lid 26 described above.

FIG. 8 is a perspective view of the valve body 22 as viewed from the second end side in the axial direction.
As shown in FIG. 8, the spoke portions 83 to 85 project radially from the outer peripheral surface of the rotating shaft 81 with respect to the axis O. In the illustrated example, each of the spoke portions 83 to 85 is formed, for example, at intervals of 120 ° in the circumferential direction (first spoke portion 83, second spoke portion 84, and third spoke portion 85).
As shown in FIGS. 5, 7, and 8, each spoke portion 83 to 85 extends axially to a portion of the rotating shaft 81 that avoids both ends in the axial direction. In the present embodiment, the edges of the spoke portions 83 to 85 on the first end side in the axial direction are on the first end side in the axial direction with respect to the radiator outlet 41b described above, and are axially more than the fail opening 41a described above. It is located on the second end side of.

The valve barrel portion 82 is arranged coaxially with the axis O. The radial outer ends of the spoke portions 83 to 85 described above are connected to the inner peripheral surface of the valve cylinder portion 82. The inside of the valve barrel portion 82 constitutes a flow passage 93 in which the cooling water that has flowed into the casing 21 through the inflow port 37a flows in the axial direction. As shown in FIGS. 4 and 8, the flow passage 93 is formed into a plurality of flow paths (first flow path 94, second flow path 95, and third flow path 96) in the circumferential direction by the spoke portions 83 to 85 described above. It is divided. Specifically, the first flow path 94 is partitioned in the circumferential direction by the first spoke portion 83 and the second spoke portion 84. The second flow path 95 is partitioned in the circumferential direction by the second spoke portion 84 and the third spoke portion 85. The third flow path 96 is partitioned in the circumferential direction by the first spoke portion 83 and the third spoke portion 85. As shown in FIG. 5, a portion in the casing 21 located on the first end side in the axial direction with respect to the valve cylinder portion 82 and the spoke portions 83 to 85 (position avoiding the valve cylinder portion 82 in the axial direction). Consists of a connecting flow path 98 communicating with the flow path 93.

FIG. 9 is a developed view of the valve barrel portion 82.
As shown in FIGS. 8 and 9, in the valve barrel portion 82, a radiator communication port 100 that penetrates the valve barrel portion 82 in the radial direction is formed at the same position in the axial direction as the radiator outlet 41b described above. .. The radiator communication port 100 communicates the radiator outlet 41b with the inside of the flow passage 93 through the radiator communication port 100 when at least a part of the radiator outlet 41b overlaps with the radiator outlet 41b when viewed from the radial direction. In the present embodiment, the radiator communication port 100 is formed in a round hole. Further, two radiator communication ports 100 are formed, for example, at intervals in the circumferential direction.

In the valve barrel portion 82, a bypass communication port 102 that penetrates the valve barrel portion 82 in the radial direction is formed at the same position in the axial direction as the bypass outlet 55a described above. The bypass communication port 102 communicates the bypass outlet 55a with the inside of the flow passage 93 through the bypass communication port 102 when at least a part of the bypass outlet 55a overlaps with the bypass outlet 55a when viewed from the radial direction. In the present embodiment, the bypass communication port 102 is formed in a round hole. Further, two bypass communication ports 102 are formed, for example, at intervals in the circumferential direction.

In the valve cylinder portion 82, a warm-up communication port 104 that penetrates the valve cylinder portion 82 in the radial direction is formed at the same position in the axial direction as the warm-up outlet 56a described above. When at least a part of the warm-up outlet 56a overlaps with the warm-up outlet 56a when viewed from the radial direction, the warm-up communication port 104 communicates the warm-up outlet 56a with the inside of the flow passage 93 through the warm-up communication port 104. In the present embodiment, the warm-up communication port 104 is formed in a round hole. Further, four warm-up communication ports 104 are formed, for example, at intervals in the circumferential direction.

In the valve cylinder portion 82, an air conditioning communication port 106 that penetrates the valve cylinder portion 82 in the radial direction is formed at the same position in the axial direction as the air conditioning outlet 66a described above. The air conditioning communication port 106 communicates the air conditioning outlet 66a with the inside of the flow passage 93 through the air conditioning communication port 106 when at least a part of the air conditioning outlet 66a overlaps with the air conditioning outlet 66a when viewed from the radial direction. The air-conditioning communication port 106 is formed in, for example, an elongated hole having a circumferential direction as an elongated direction. In the present embodiment, the air conditioning communication port 106 is formed so as to straddle the third spoke portion 85 in the circumferential direction.

The axial opening width of the air conditioning communication port 106 is narrower than the axial distance between the bypass outlet 55a and the warm-up outlet 56a described above. Therefore, the air conditioning communication port 106 is configured so as not to communicate with the bypass outlet 55a and the warm-up outlet 56a. The axial opening width of the air conditioning communication port 106 is smaller than the inner diameter of the air conditioning outlet 66a described above.

The valve body 22 switches between communication and interruption between the inside of the flow passage 93 and each of the outlets 41b, 55a, 55b, 66a as the valve body 22 rotates around the axis O. Then, the cooling water flowing into the casing 21 is distributed to each of the flow paths 11 to 14 through the outlet that communicates with the communication port among the outlets. The communication pattern between the outlet and the communication port can be set as appropriate. Then, the layout of the outlet and the communication port can be switched according to the set communication pattern.

As shown in FIG. 3, a sealing mechanism 110 for sealing between the outer peripheral surface of the valve barrel portion 82 and the inner peripheral surface of the casing main body 25 is provided in the radiator outlet 41b described above. The seal mechanism 110 includes a sliding ring 111, a seal ring 112, and an urging member 113.
The sliding ring 111 is inserted into the radiator outlet 41b. The radial inner end surface of the sliding ring 111 is slidably in contact with the outer peripheral surface of the valve barrel portion 82. In the present embodiment, the inner end surface of the sliding ring 111 in the radial direction is a curved surface formed according to the radius of curvature of the valve barrel portion 82.

The seal ring 112 is, for example, a U packing. The seal ring 112 is fitted onto the sliding ring 111. The outer peripheral surface of the seal ring 112 is slidably close to the inner peripheral surface of the radiator outlet 41b.
The urging member 113 is interposed between the outer end surface of the sliding ring 111 in the radial direction and the flange portion 43 of the radiator joint 42. The urging member 113 is, for example, a wave spring. The urging member 113 urges the sliding ring 111 inward in the radial direction (toward the valve barrel portion 82).

The above-mentioned bypass outlet 55a, warm-up outlet 56a, and air-conditioning outlet 66a are also provided with a seal mechanism 110 having the same configuration as the seal mechanism 110 provided in the radiator outlet 41b. In the present embodiment, the seal mechanism 110 provided in the bypass outlet 55a, the warm-up outlet 56a, and the air conditioning outlet 66a is designated by the same reference numerals as the seal mechanism 110 provided in the radiator outlet 41b. The explanation is omitted.

As shown in FIG. 5, a regulation wall portion 120 that blocks a part of the flow passage 93 is formed in a portion of the valve body 22 located between the bypass communication port 102 and the air conditioning communication port 106 in the axial direction. Has been done. As shown in FIG. 4, the regulation wall portion 120 closes a range of about two-thirds of the above-mentioned flow passage 93 in the circumferential direction. In the present embodiment, of the respective flow paths 94 to 96 constituting the flow path 93, the first flow path 94 and the second flow path 95 are arranged on the first end side and the second end side in the axial direction by the regulation wall portion 120. It is partitioned into. In this case, as shown in FIG. 5, of the first flow path 94 and the second flow path 95, the region on the first end side with respect to the regulation wall portion 120 communicates directly with the above-mentioned connection flow path 98. It constitutes the flow path 121. On the other hand, of the first flow path 94 and the second flow path 95, in the region on the second end side with respect to the regulation wall portion 120, the cooling water flowing through the third flow path 96 is spoken (for example, the first spoke). A folded flow path 125 is formed which flows in after being folded at a portion on the second end side in the axial direction in the portion 83 and the third spoke portion 85). Then, the regulation wall portion 120 regulates the flow of the cooling water flowing into the folded flow path 125 to the first end side in the axial direction.

As shown in FIG. 9, in the present embodiment, each of the radiator communication ports 100 described above communicates with, for example, the communication flow paths 121 in the first flow path 94 and the second flow path 95 described above.
In each bypass communication port 102, for example, one bypass communication port 102 communicates with the communication flow path 121, and the other bypass communication port 102 communicates with the third flow path 96.
For example, a part of the air conditioning communication port 106 communicates with the folded flow path 125, and the remaining part communicates with the third flow path 96.

In each warm-up communication port 104, for example, three warm-up communication ports 104a to 104c communicate with each other in the folded flow path 125. On the other hand, of the warm-up communication ports 104, for example, the remaining one warm-up communication port 104d communicates with the third flow path 96. If the warm-up communication port 104 (for example, the warm-up communication port 104b) that opens the valve at least at the same timing as the radiator communication port 100 communicates with the return flow path 125. I do not care. Further, in the flow passage 93, the flow path cross-sectional area other than the portion blocked by the regulation wall portion 120 (the flow path cross-sectional area of the third flow path 96) is set to be equal to or larger than the opening area of any warm-up communication port 104. If so, it can be changed as appropriate.

[Action]
Next, the operation of the control valve 8 described above will be described. In the following description, for example, the flow of the cooling water in the communication pattern shown in FIG. 10 will be mainly described. That is, in the communication pattern shown in FIG. 10, the radiator outlet 41b communicates with the radiator communication port 100 into the flow passage 93 (communication flow path 121). Further, the warm-up outlet 56a communicates with the flow passage 93 (folding flow path 125) through the warm-up communication port 104b. Further, the air conditioning outlet 66a communicates with the air conditioning communication port 106 into the flow passage 93 (folded flow path 125).

As shown in FIG. 1, in the main flow path 10, the cooling water delivered by the water pump 3 is heat-exchanged by the engine 2 and then flows toward the control valve 8. As shown in FIG. 5, the cooling water that has passed through the engine 2 in the main flow path 10 flows into the connecting flow path 98 in the casing 21 through the inflow port 37a.

As shown in FIG. 6, some of the cooling water that has flowed into the connecting flow path 98 flows into the EGR outlet 51a of the EGR port 51 after passing through the fail opening 41a. The cooling water that has flowed into the EGR outlet 51a is supplied into the EGR flow path 15 through the EGR joint 52. The cooling water supplied into the EGR flow path 15 is returned to the main flow path 10 after heat exchange between the cooling water and the EGR gas is performed in the EGR cooler 7.

In this way, the cooling water supplied to the EGR flow path 15 flows into the connection flow path 98 and then flows into the EGR outflow port 51a without passing through the flow path 93. That is, the cooling water always flows into the EGR outlet 51a regardless of the rotation position of the valve body 22. As a result, for example, when the radiator outlet 41b, the bypass outlet 55a, the warm-up outlet 56a, and the air conditioning outlet 66a are all in the closed state (when the valve body 22 is fully closed), the flow flows from the connection flow path 98. The flow of cooling water toward the road 93 is weakened. Therefore, when the valve body 22 is fully closed, the contamination that has entered the casing 21 can be suppressed from flowing toward the valve body 22, and the contamination can be positively discharged from the EGR outlet 51a. As a result, it is possible to prevent contamination from being caught between the outer peripheral surface of the valve barrel portion 82 and the inner peripheral surface of the casing 21 (peripheral wall portion 31) and hinder the rotation of the valve body 22.

On the other hand, as shown in FIG. 5, among the cooling water that flowed into the connecting flow path 98, the cooling water that did not flow into the EGR outlet 51a flows from the first end side in the axial direction to the flow path 93 (third). It flows into the flow path 96 and the communication flow path 121). The cooling water that has flowed into the flow passage 93 is distributed to each outlet in the process of circulating in the flow passage 93 in the axial direction. Specifically, as shown in FIGS. 5 and 10, some of the cooling water flowing through the flow passage 93 flows into the radiator communication port 100 when it reaches the radiator port 41. The cooling water that has flowed into the radiator communication port 100 flows into the radiator communication portion 44b of the radiator joint 42 through the radiator outlet 41b. The cooling water that has flowed into the radiator communication portion 44b is supplied to the radiator flow path 11 after flowing through the confluence portion 44c. The cooling water supplied to the radiator flow path 11 is returned to the main flow path 10 again after heat exchange with the radiator 4.

Of the cooling water that has passed through the radiator port 41 in the flow passage 93, the cooling water that flows in the communication flow path 121 (the first flow path 94 and the second flow path 95) is the first in the axial direction by the regulation wall portion 120. Distribution to the two ends is restricted. On the other hand, as shown in FIGS. 8 and 10, of the cooling water that has passed through the radiator port 41 in the flow passage 93, the cooling water that flows in the third flow path 96 is the second end of the spoke portions 83 and 85. It is folded back to the first end side in the axial direction at the side portion (the flow direction of the cooling water is changed).

As a result, as shown in FIGS. 5 and 10, the cooling water flows into the folded flow path 125. The cooling water that has flowed into the folded flow path 125 reaches the warm-up port 56. Then, the cooling water flows into the warm-up outlet 56a through the warm-up communication port 104b that communicates with the warm-up outlet 56a among the warm-up communication ports 104. The cooling water that has flowed into the warm-up outlet 56a is supplied into the warm-up flow path 13 through the warm-up joint 62. The cooling water supplied into the warm-up flow path 13 is returned to the main flow path 10 after heat exchange with the engine oil in the oil warmer 5.

Of the cooling water flowing in the folded flow path 125, the cooling water that has passed through the warm-up port 56 reaches the air conditioning port 66. Then, the cooling water flows into the air conditioning outlet 66a through the air conditioning communication port 106. The cooling water that has flowed into the air conditioning outlet 66a is supplied into the air conditioning flow path 14 through the air conditioning joint 68. The cooling water supplied into the air conditioning flow path 14 is returned to the main flow path 10 after heat exchange with the air conditioning air in the heater core 6. In the communication pattern shown in FIG. 10, the air-conditioning communication port 106 may communicate with the third flow path 96. That is, the cooling water may be distributed to the air conditioning communication port 106 in the process of flowing through the third flow path 96.

Here, in the folded flow path 125, the flow of the cooling water to the first end side in the axial direction is regulated by the regulation wall portion 120 (the flow direction is changed). Therefore, of the cooling water that has flowed into the turn-back flow path 125, the cooling water that has not been supplied into the warm-up flow path 13 or the air-conditioning flow path 14 stays in the turn-back flow path 125.
The above is the flow of the cooling water in the control valve 8 in the communication pattern shown in FIG.

In the control valve 8, in order to switch the communication pattern between the outlet and the communication port, the valve body 22 is rotated around the axis O. Then, by stopping the rotation of the valve body 22 at a position corresponding to the communication pattern to be set, the outlet and the communication port communicate with each other in a communication pattern corresponding to the stop position of the valve body 22. For example, the communication pattern shown in FIG. 9, only the warm-up outlet 56a is in communication with the flow path 9 within 3 through warm-up communication port 104d. In this case, of the cooling water flowing into the flow passage 93, the cooling water flowing through the third flow path 96 is supplied to the warm-up flow path 13 from the warm-up outlet 56a through the warm-up communication port 104d.

Further, in the control valve 8 of the present embodiment, when the cooling water temperature rises excessively at the time of occurrence of an abnormality, the cooling water is supplied to the radiator flow path 11 through the fail opening 41a. Specifically, when the temperature of the cooling water flowing into the casing 21 becomes equal to or higher than a predetermined temperature, the wax of the thermostat 45 thermally expands, so that the valve body moves in the valve opening direction. As a result, the fail opening 41a is opened. When the fail opening 41a is opened, the cooling water in the connection flow path 98 flows into the fail communication portion 44a through the fail opening 41a. The cooling water that has flowed into the fail communication portion 44a is supplied to the radiator flow path 11 after flowing through the confluence portion 44c. As a result, the cooling water can be supplied to the radiator flow path 11 regardless of the communication pattern (regardless of the opening and closing of the radiator outlet 41b).

As described above, in the present embodiment, since the thermostat 45 is arranged in the portion of the casing 21 that faces the inflow port 37a in the radial direction, the cooling water that has flowed into the casing 21 is directed to the thermostat 45. Can be applied effectively. Thereby, the temperature sensing performance of the thermostat 45 can be improved. As a result, the fail opening 41a can be quickly opened and closed according to the cooling water temperature regardless of the rotation position of the valve body 22 (regardless of the communication state between the radiator outlet 41b and the radiator communication port 100).

In the present embodiment, the EGR outlet 51a that opens in the direction orthogonal to the opening direction of the fail opening 41a is formed in the radiator port 41.
According to this configuration, the cooling water that has flowed into the casing 21 through the inflow port 37a hits the thermostat 45 and then flows out to the EGR flow path 15 through the EGR outflow port 51a. Therefore, since a flow toward the EGR outlet 51a can be created around the thermostat 45 in the casing 21, it is possible to suppress the formation of a stagnation point around the thermostat 45. Therefore, the temperature sensing performance of the thermostat 45 can be further improved.

In the present embodiment, the radiator joint 42 that communicates collectively with the fail opening 41a and the radiator outlet 41b is welded to the opening end surface of the radiator port 41.
According to this configuration, since the radiator joint 42 communicates with the fail opening 41a and the radiator outlet 41b collectively, the number of parts can be reduced and the number of parts can be reduced as compared with the case where separate joints are welded to the fail opening 41a and the radiator outlet 41b. The welding process can be reduced. Further, as compared with the case where separate joints are welded to the fail opening 41a and the radiator outlet 41b, the welding allowance of the radiator joint 42 at the portion located between the fail opening 41a and the radiator outlet 41b can be reduced. As a result, the control valve 8 can be miniaturized in the axial direction.
Moreover, in the present embodiment, since the inflow port 37a is formed at a position facing the fail opening 41a, the opening end surface of the inflow port 37a can function as a seating surface at the time of welding of the radiator joint 42. As a result, the welding work can be performed efficiently.

In the present embodiment, since the radiator joint 42 is connected to the radiator flow path 11, when the cooling water temperature becomes equal to or higher than a predetermined temperature, the cooling water can be supplied to the radiator 4 through the fail opening 41a. As a result, the temperature of the cooling water can be quickly lowered to less than a predetermined temperature.

(Second Embodiment)
Next, the second embodiment of the present invention will be described. In the present embodiment, the above-described first points are that both ends of the rotating shaft 81 in the axial direction are open to the atmosphere and that the EGR joint (first joint) 242 is integrally formed with the lid 26. It is different from one embodiment. In the following description, the same reference numerals will be given to the same configurations as those in the first embodiment described above, and the description thereof will be omitted.

FIG. 11 is an enlarged cross-sectional view showing the first end side in the axial direction of the control valve 8 according to the second embodiment.
As shown in FIG. 11, the valve body 22 of the present embodiment is configured by insert molding the inner shaft portion 202 inside the valve body main body 201.
The inner shaft portion 202 is formed of a material (for example, a metal material) having a higher rigidity than the valve body body 201 (for example, a resin material). The inner shaft portion 202 extends coaxially with the axis O.

The portion on the first end side of the inner shaft portion 202 penetrates the bottom wall portion 32 in the axial direction through the through hole (open to the atmosphere) 32a. The portion on the first end side of the inner shaft portion 202 is rotatably supported by the first bush (bearing) 88 provided on the bottom wall portion 32 described above. Specifically, the bottom wall portion 32 is formed with a first shaft accommodating wall 210 toward the second end side in the axial direction. The first shaft accommodating wall 210 surrounds the above-mentioned through hole 32a. The first bush 88 described above is fitted in the first shaft accommodating wall 210.

A connecting portion 202a is formed in a portion of the inner shaft portion 202 located on the first end side in the axial direction with respect to the first bush 88 (a portion located outside the bottom wall portion 32). The connecting portion 202a is formed to have a smaller diameter than the portion of the inner shaft portion 202 other than the connecting portion 202a (large diameter portion 202b), and a spline is formed on the outer peripheral surface. The connecting portion 202a is connected to the drive unit 23 described above outside the casing 21.

FIG. 12 is an enlarged cross-sectional view showing the second end side in the axial direction of the control valve 8 according to the second embodiment.
As shown in FIG. 12, the portion of the inner shaft portion 202 on the second end side is rotatably supported by the second bush (bearing) 91 provided on the lid body 26 described above. Specifically, the lid 26 is formed with a second shaft accommodating wall 211 toward the first end side in the axial direction. The above-mentioned second bush 91 is fitted in the second shaft accommodating wall 211.

As shown in FIG. 11, the valve body 201 surrounds the inner shaft portion 202 described above. The valve body 201 has an outer shaft portion 220 that covers the inner shaft portion 202, a valve cylinder portion 82 that surrounds the outer shaft portion 220, and spoke portions 83 to 85 that connect the outer shaft portion 220 and the valve cylinder portion 82 to each other. (See FIG. 4) and mainly.

The outer shaft portion 220 surrounds the inner shaft portion 202 over the entire circumference in a state where both ends in the axial direction of the inner shaft portion 202 are exposed. In the present embodiment, the outer shaft portion 220 and the inner shaft portion 202 constitute the rotating shaft 81 of the valve body 22.

Both ends of the rotating shaft 81 in the axial direction are formed in a stepped shape in which the outer diameter gradually decreases from the inside to the outside in the axial direction. Specifically, the outer diameter of the portion on the first end side of the rotating shaft 81 is reduced in the order of the outer shaft portion 220, the large diameter portion 202b of the inner shaft portion 202, and the connecting portion 202a. The end surface 220a on the first end side in the axial direction of the outer shaft portion 220 is configured to be in contact with the first bush 88 described above from the second end side in the axial direction.
On the other hand, as shown in FIG. 12, the outer diameter of the portion on the second end side of the rotating shaft 81 is reduced in the order of the outer shaft portion 220 and the larger diameter portion 202b of the inner shaft portion 202. The end surface 220b on the second end side in the axial direction of the outer shaft portion 220 is configured to be in contact with the above-mentioned second bush 91 from the first end side in the axial direction. That is, the bushes 88 and 91 of the present embodiment support the rotating shaft 81 in the radial direction and the axial direction.

As shown in FIG. 11, in the above-mentioned first shaft accommodating wall 210, a first seal ring 230 is provided on the second end side in the axial direction with respect to the first bush 88. The first seal ring 230 seals between the inner peripheral surface of the first shaft accommodating wall 210 and the outer peripheral surface of the rotating shaft 81 (outer shaft portion 220).

A portion of the first shaft accommodating wall 210 located on the first end side in the axial direction with respect to the first seal ring 230 is open to the atmosphere through the through hole 32a. Therefore, the portion of the rotating shaft 81 on the first end side (the portion of the rotating shaft 81 located on the first end side in the axial direction with respect to the seal portion (outer shaft portion 220) of the first seal ring 230) Atmospheric pressure acts through the gap between the drive unit 23 and the bottom wall portion 32, the through hole 32a, the gap between the first shaft accommodating wall 210 and the first bush 88, and the like. At this time, in the portion on the first end side of the rotating shaft 81, the pressure receiving surface in the axial direction is an end surface facing the first end side of each of the connecting portion 202a, the large diameter portion 202b, and the outer shaft portion 220.

On the other hand, as shown in FIG. 12, in the above-mentioned second shaft accommodating wall 211, a second seal ring 231 is provided on the first end side in the axial direction with respect to the second bush 91. The second seal ring 231 seals between the inner peripheral surface of the second shaft accommodating wall 211 and the outer peripheral surface of the rotating shaft 81 (outer shaft portion 220).

The lid 26 is formed with a through hole (open to the atmosphere) 233 that penetrates the lid 26 in the axial direction. Specifically, the through hole 233 is provided at a position on the lid 26 that is coaxial with the axis O and faces the shaft end surface 238. In the lid body 26, an outer through hole 234, which is a trace of a pin gate at the time of resin molding, is formed in a portion located on the outer side in the radial direction with respect to the through hole 233. In the present embodiment, a plurality of outer through holes 234 are formed at intervals in the circumferential direction around the axis O. The inner diameter of the through holes 233 and 234 described above is preferably smaller than the gap between the casing 21 and the valve barrel portion 82. As a result, even if contamination enters the casing 21 through the through holes 233 and 234, it is possible to prevent the contamination from being caught between the casing 21 and the valve barrel portion 82 and hindering the rotation of the valve body 22. .. However, the design of the number, shape, position, etc. of the through holes 233 and 234 can be changed as appropriate.

In the second shaft accommodating wall 211, a space defined on the second end side in the axial direction with respect to the sealing portion between the rotating shaft 81 and the second seal ring 231 is open to the atmosphere through the through hole 233. Therefore, through the through hole 233, the portion of the rotating shaft 81 on the second end side (the second end side of the rotating shaft 81 in the axial direction with respect to the seal portion (outer shaft portion 220) of the second seal ring 231) is passed through. Atmospheric pressure is working. That is, in the present embodiment, no differential pressure is generated in the pressure acting on both ends of the rotating shaft 81. The through hole 233 is not limited to coaxial with the axis O, but is formed at a position where at least a part of the lid 26 faces the shaft end surface 238 in the axial direction, and the lid 26, the second bush 91, and the shaft end surface are formed. It does not matter as long as it communicates with the part defined by 238.

On the second end side of the rotating shaft 81, the pressure receiving surface in the axial direction is an end surface facing the second end side of each of the large diameter portion 202b and the outer shaft portion 220. In the present embodiment, it is preferable that the areas of the pressure receiving surfaces projected in the axial direction are equal to each other. However, the area of each pressure receiving surface can be changed as appropriate.

A regulation wall 235 projecting to the second end side in the axial direction is formed in a portion of the lid 26 located inside the second shaft accommodating wall 211 in the radial direction. The regulation wall 235 surrounds the above-mentioned through hole 233.

An EGR outlet 240 is formed in a portion of the lid 26 located closer to the radiator port 41 in the radial direction with respect to the regulation wall 235. The EGR outlet 240 penetrates the lid 26 in the axial direction. Also in this embodiment, the EGR outlet 240 intersects (orthogonally) in the opening direction (diameter direction) of the fail opening 41a. Further, the EGR outlet 240 overlaps the thermostat 45 at least in a part in the front view when viewed from the axial direction.

In the lid body 26, an EGR joint 242 is formed at the opening edge of the EGR outlet 240. The EGR joint 242 is formed in a tubular shape extending outward in the radial direction toward the second end side in the axial direction. The EGR joint 242 connects the EGR outlet 240 and the upstream end of the EGR flow path 14 (see FIG. 1) described above. In the present embodiment, the EGR joint 242 is integrally formed with the lid body 26.

In this embodiment, in addition to exhibiting the same effects as those of the first embodiment described above, the following effects are exhibited.
That is, since the EGR joint 242 is integrally formed with the lid body 26, the number of parts can be reduced and the welding process can be performed as compared with the case where the EGR joint is separately attached to the casing body 25 and the lid body 26 (welding, etc.). Can be reduced.
Further, the EGR joint 242 (EGR outlet 240) is arranged on the side opposite to the flow passage 93 in the axial direction with the inflow port 37a in between. Therefore, when the valve body 22 is fully closed, the contamination that has entered the casing 21 can be more reliably suppressed from flowing toward the valve body 22, and the contamination can be positively discharged from the EGR outlet 240.

In the present embodiment, since both ends of the rotating shaft 81 in the axial direction are open to the atmosphere, no differential pressure is generated in the pressure acting on both ends of the rotating shaft 81. Therefore, as compared with the case where one end of the rotating shaft 81 is arranged in the cooling water and the pressure acting on each pressure receiving surface is different, the axial direction acting on each pressure receiving surface of the rotating shaft 81 is different. It becomes easier to set the load evenly. As a result, it is possible to prevent the rotating shaft 81 from being pressed against the low pressure side in the axial direction.

Therefore, in the present embodiment, for example, the following effects are obtained.
(1) It is possible to suppress the valve body 22 from being pressed toward the drive unit 23 and suppress an increase in the load torque of the drive unit 23. Therefore, it is possible to suppress the increase in output and size of the drive unit 23.
(2) Since the axial load transmitted from the rotating shaft 81 to the casing 21 and the drive unit 23 can be reduced, it is not necessary to newly provide a thrust bearing in addition to the radial bearing. As a result, it is possible to reduce the number of parts and suppress the increase in size of the control valve in the axial direction. Further, even if a thrust bearing is provided separately from the radial bearing, a low-cost and simple thrust bearing can be selected, and the cost of the control valve 8 can be reduced.
(3) Since the axial misalignment of the valve body 22 with respect to the casing 21 can be suppressed, the outlet formed in the casing 21 and the communication port of the valve body 22 can be set at desired positions in the axial direction. Thereby, the desired flow rate characteristics can be obtained.

In particular, in the present embodiment, since the pressure receiving surfaces of the rotating shaft 81 are equal to each other, the above-mentioned effects are more remarkably exerted.

The technical scope of the present invention is not limited to each of the above-described embodiments, and includes various modifications to the above-described embodiments without departing from the spirit of the present invention.
For example, in the above-described embodiment, the configuration in which the control valve 8 is mounted on the cooling system 1 of the engine 2 has been described, but the configuration is not limited to this configuration and may be mounted on other systems.
In the above-described embodiment, the configuration in which the cooling water flowing into the control valve 8 is distributed to the radiator flow path 11, the bypass flow path 12, the warm-up flow path 13, the air conditioning flow path 14, and the EGR flow path 15 has been described. It is not limited to this configuration. The control valve 8 may be configured to distribute the cooling water flowing into the control valve 8 to at least two flow paths.
In addition, the layout, type, shape, etc. of each communication port and outlet can be changed as appropriate.

In the above-described embodiment, the configuration in which each joint is welded to the open end surface of each distribution port has been described, but the configuration is not limited to this configuration, and each joint is attached to each distribution port by another method (for example, bonding or fastening). It may be fixed to the open end face.
In the above-described embodiment, for example, a configuration in which the inflow port, each communication port, and each outflow port penetrate the valve cylinder portion 82 and the casing 21 in the radial direction has been described, but the present invention is not limited to this configuration. For example, each communication port and each outlet may penetrate the valve cylinder portion 82 and the casing 21 in the axial direction, respectively.

In the above-described embodiment, the configuration in which the fail opening 41a communicates with the radiator flow path 11 has been described, but the configuration is not limited to this configuration.
In the above-described embodiment, the first outlet is described as the radiator outlet 41b, but the present invention is not limited to this configuration.

In addition, it is possible to replace the constituent elements in the above-described embodiment with well-known constituent elements as appropriate without departing from the spirit of the present invention, and the above-mentioned modified examples may be appropriately combined.

4 ... Radiator 7 ... EGR cooler (heat exchanger)
8 ... Control valve 21 ... Casing 22 ... Valve body 32a ... Through hole (open to the atmosphere)
37a ... Inflow port 41a ... Fail opening 41b ... Radiator outlet (first outlet)
42 ... Radiator joint (2nd joint)
45 ... Thermostat 51a ... EGR outlet (second outlet)
81 ... Rotating shaft 82 ... Valve cylinder 88 ... First bush (bearing)
91 ... 2nd bush (bearing)
98 ... Connection flow path 230 ... First seal ring 231 ... Second seal ring 233 ... Through hole (open to the atmosphere)
242 ... EGR joint (first joint)

Claims (6)

A tubular casing with a fluid inlet and a first outlet,
A valve body that is rotatably housed in the casing around an axis extending in the axial direction of the casing and has a flow passage that communicates with the inflow port and allows a fluid to flow through the casing.
The valve body is formed with a first communication port that communicates with the flow passage and the first outlet according to the rotation position of the valve body.
A thermostat is arranged in a portion of the casing facing the inflow port in the opening direction of the inflow port, and a fail opening configured to be openable and closable by the thermostat is formed.
A control valve characterized in that a second outlet that opens in a direction intersecting the opening direction of the fail opening is formed in a portion of the casing that is adjacent to the fail opening. The casing is
With a bottomed tubular casing body
It has a lid that closes the opening of the casing body, and has.
The fail opening radially penetrates a portion of the casing body located closer to the lid in the axial direction.
The second outlet penetrates the lid in the axial direction and passes through the lid.
It said lid includes a heat exchanger arranged outside the casing, in claim 1 in which the first joint for connecting the second outlet, between which is characterized in that is formed integrally The control valve described. The valve body
A rotating shaft rotatably supported by the casing,
It has a valve cylinder portion that surrounds a part of the rotating shaft in the axial direction, defines the flow path between the rotating shaft and the rotating shaft, and has a first communication port formed therein.
In the casing, a position avoiding the valve cylinder portion in the axial direction constitutes a connecting flow path for communicating the inflow port and the flow path.
The control valve according to claim 1 or 2 , wherein the second outlet is directly connected to the connection flow path. A tubular casing with a fluid inlet and a first outlet,
A valve body that is rotatably housed in the casing around an axis extending in the axial direction of the casing and has a flow passage that communicates with the inflow port and allows a fluid to flow through the casing.
The valve body is formed with a first communication port that communicates with the flow passage and the first outlet according to the rotation position of the valve body.
A thermostat is arranged in a portion of the casing facing the inflow port in the opening direction of the inflow port, and a fail opening configured to be openable and closable by the thermostat is formed.
The valve body
A rotating shaft whose both ends in the axial direction are rotatably supported by the casing via bearings, respectively.
It has a valve cylinder portion that surrounds the rotating shaft and defines the flow passage between the rotating shaft and the rotating shaft, and has a first communication port formed therein.
A seal ring is arranged between the portion of the casing located inside the bearing in the axial direction and the rotating shaft.
A control valve characterized in that the casing is formed with an atmospheric opening portion that opens a portion located outside the axial direction to the atmosphere with respect to the sealing ring. A tubular casing with a fluid inlet and a first outlet,
A valve body that is rotatably housed in the casing around an axis extending in the axial direction of the casing and has a flow passage that communicates with the inflow port and allows a fluid to flow through the casing.
The valve body is formed with a first communication port that communicates with the flow passage and the first outlet according to the rotation position of the valve body.
A thermostat is arranged in a portion of the casing facing the inflow port in the opening direction of the inflow port, and a fail opening configured to be openable and closable by the thermostat is formed.
The first outlet and the fail opening are formed side by side with the casing.
The outer surface of the casing surrounds the first outlet and the fail opening, and has a welded portion in which a second joint that communicates with the first outlet and the fail opening is welded together. A control valve featuring. The control valve according to claim 5 , wherein the second joint is connected to a radiator of a vehicle.

Images