This application is based on Japanese Patent Application No. 2019-26883 filed on Feb. 18, 2019, the disclosure of which is incorporated herein by reference.
The present disclosure relates to a cooling device for an injection valve installed in a vehicle.
In a field of a diesel engine, a DPF (Diesel Particulate Filter) for collecting PM (Particulate Matter) contained in exhaust gas emitted from the diesel engine as well as an SCR (Selective Catalytic Reduction) system for purifying NOx (nitrogen oxide) contained in the exhaust gas is known in the art. An injection valve to be used for regenerating the DPF injects fuel (such as, light oil) into an exhaust pipe of a vehicle. An injection valve to be used in the SCR system injects reducing agent (such as, urea aqueous solution) into the exhaust pipe of the vehicle. Each of those injection valves is provided at a position neighboring to the diesel engine or provided in an engine room and the injection valve is used under a high-temperature circumstance. It is, therefore, necessary to provide a cooling device to cool down the injection valve and to protect them from a thermal damage.
The cooling device is generally installed in the vehicle in such a way that an axis of the cooling device is inclined with respect to a gravity direction. In addition, the cooling device installed in the vehicle is further inclined with respect to the gravity direction due to an inclination of the vehicle on a road. Air bubbles may enter the cooling water, which is supplied into an annular space of the cooling device. In such a case, the air bubbles may remain in an upper-side portion of the annular space. Then, cooling performance of the cooling device to the injection valve may be decreased.
In the cooling device which is inclined with respect to the gravity direction, a level of water surface in the annular space is changed depending on a position of connecting pipes connected to circumferential portions of a jacket of the cooling device. When the level of the water surface is lowered in the annular space depending on an installed condition of the cooling device in the vehicle, it may become difficult to effectively cool down the injection valve.
The present disclosure is made in view of the above problem. It is an object of the present disclosure to provide a cooling device, which can increase a cooling performance to an injection valve.
The above and other objects, features and advantages of the present disclosure will become more apparent from the following detailed description made with reference to the accompanying drawings. In the drawings:
The present disclosure will be explained hereinafter by way of multiple embodiments and/or modifications with reference to the drawings. The same reference numerals are given to the same or similar structures and/or portions in order to avoid repeated explanation.
A cooling device 1 of a first embodiment will be explained with reference to the drawings. The cooling device 1 cools down by cooling water an injection valve installed in an automotive vehicle. The injection valve to be cooled down by the cooling device is composed of, for example, an injection valve to be used in an SCR (Selective Catalytic Reduction) system for purifying NOx (nitrogen dioxide) contained in exhaust gas emitted from a diesel engine, an injection valve for regenerating DPF (Diesel Particulate Filter) which traps PM (Particulate Material) contained in the exhaust gas, or the like. The injection valve used in the SCR system injects reducing agent, for example urea aqueous solution, into an exhaust pipe. The injection valve used for regenerating the DPF injects fuel, for example light oil, into the exhaust pipe. Those injection valves are located at a position of the exhaust pipe closer to an internal combustion engine (hereinafter, the engine) or at a position inside of an engine compartment. Therefore, those injection valves are generally used in a circumstance of high temperature. In such a case, a cooling device is provided for the injection valve in order to avoid a thermal damage in the injection valve, wherein the injection valve is cooled down by cooling water flowing through the cooling device.
A structure of the cooling device 1 will be explained. As shown in
The outer jacket 10 is formed in a cylindrical shape having a bottom portion. The outer jacket 10 has an outer casing 11 and an outer-side bottom portion 12, which is formed at an axial end of the outer casing 11 on the injection-port side. The outer casing 11 of the outer jacket 10 has such a shape, according to which a diameter of the outer casing 11 is changed in a step-wise manner in its axial direction. The outer casing 11 has an outer-side large-diameter portion 111, an outer-side middle-diameter portion 112, and an outer-side small-diameter portion 113, which are arranged in an axial-downward direction from the injection-port opposite side (the upper side) to the injection-port side (the lower side). The diameter of the outer-side middle diameter portion 112 is smaller than the diameter of the outer-side large-diameter portion 111. The diameter of the outer-side small-diameter portion 113 is smaller than the diameter of the outer-side middle-diameter portion 112. A first outer-side step portion 114 is formed in the outer casing 11 at a position between the outer-side large-diameter portion 111 and the outer-side middle-diameter portion 112. A second outer-side step portion 115 is formed in the outer casing 11 at a position between the outer-side middle-diameter portion 112 and the outer-side small-diameter portion 113. An outer-side through-hole 13 is formed in the outer-side bottom portion 12, so that a forward end of the injection valve 70 on the injection-port side is exposed to an outside of the cooling device 1 through the outer-side through-hole 13.
In a similar manner to the outer jacket 10, the inner jacket 20 is formed in a cylindrical shape having a bottom portion. The inner jacket 20 has an inner casing 21 and an inner-side bottom portion 22, which is formed at an axial end of the inner casing 21 on the injection-port side. The inner casing 21 of the inner jacket 20 has such a shape, according to which a diameter of the inner casing 21 is changed in a step-wise manner in its axial direction. The inner casing 21 has an inner-side large-diameter portion 211, an inner-side middle-diameter portion 212, and an inner-side small-diameter portion 213, which are arranged in the axial-downward direction from the injection-port opposite side (the upper side) to the injection-port side (the lower side). The diameter of the inner-side middle-diameter portion 212 is smaller than the diameter of the inner-side large-diameter portion 211. The diameter of the inner-side small-diameter portion 213 is smaller than the diameter of the inner-side middle-diameter portion 212. A first inner-side step portion 214 is formed in the inner casing 21 at a position between the inner-side large-diameter portion 211 and the inner-side middle-diameter portion 212. A second inner-side step portion 215 is formed in the inner casing 21 at a position between the inner-side middle-diameter portion 212 and the inner-side small-diameter portion 213. An inner-side through-hole 23 is formed in the inner-side bottom portion 22, so that the forward end of the injection valve 70 on the injection-port side is exposed to the outside of the cooling device 1 through the inner-side through-hole 23.
The inner jacket 20 is provided at an outer periphery of the injection valve 70 to surround the same. The outer jacket 10 is provided at an outside of the inner jacket 20 to surround the same. More exactly, the inner jacket 20 is in contact with an outer peripheral surface of the injection valve 70. As above, the inner jacket 20 as well as the outer jacket 10 is provided at the outside of the injection valve 70.
The outer-side large-diameter portion 111 of the outer jacket 10 and the inner-side large-diameter portion 211 of the inner jacket 20 are connected to each other at its upper-side end, for example, by welding. In addition, the outer-side bottom portion 12 of the outer jacket 10 and the inner-side bottom portion 22 of the inner jacket 20 are connected to each other, for example, by welding. As a result, an annular space 80 is formed between the outer jacket 10 and the inner jacket 20, so that cooling water flows through the annular space 80.
In a case that the injection valve 70 has a water-proof function, the inner jacket 20 is not always necessary. In such a case, the annular space 80 is formed between the outer jacket 10 and the injection valve 70.
The first pipe portion 41 is formed in the outer-side large-diameter portion 111 of the outer jacket 10 for supplying the cooling water into the annular space 80 or discharging the cooling water from the annular space 80. The second pipe portion 42 is formed in the outer-side middle-diameter portion 112 of the outer jacket 10 for supplying the cooling water into the annular space 80 or discharging the cooling water from the annular space 80. The second pipe portion 42 is located at a position closer to the forward end of the injection valve 70 than the first pipe portion 41 in the axial direction. In the present embodiment, the second pipe portion 42 works as an inlet port for supplying the cooling water into the annular space 80, while the first pipe portion 41 works as an outlet port for discharging the cooling water from the annular space 80.
The cylindrical partitioning unit 30 is provided in the annular space 80 between the outer jacket 10 and the inner jacket 20. The cylindrical partitioning unit 30 divides a part of the annular space 80 into an outside passage 81 on a side of the outer jacket 10 and an inside passage 82 on a side of the injection valve 70. The cylindrical partitioning unit 30 includes a first cylindrical member 31 and a second cylindrical member 32. The first cylindrical member 31 is arranged at an outside of the inner-side middle-diameter portion 212 and the second inner-side step portion 215 of the inner jacket 20. The second cylindrical member 32 is arranged at an outside of the inner-side small-diameter portion 213 of the inner jacket 20.
The first cylindrical member 31 includes a first cylindrical body portion 311, an outwardly extending flange portion 312 which is extending in a radial-outward direction from an upper-side end (the injection-port opposite side) of the first cylindrical member 31, and an inwardly extending flange portion 313 which is extending in a radial-inward direction from a lower-side end (the injection-port side) of the first cylindrical member 31.
A lower-side end of the first cylindrical body portion 311 (equal to the lower-side end of the first cylindrical member 31), which is a part of the first cylindrical body portion 311 adjacent to the inwardly extending flange portion 313, is fixed to an inner peripheral wall of the outer-side middle-diameter portion 112 of the outer jacket 10 by a press-fit process. A press-fit portion between the first cylindrical body portion 311 and the outer jacket 10 works as the first restricting portion 51 for restricting a flow of the cooling water in the annular space 80. The first restricting portion 51 is formed in a circumferential direction of the valve device 1 at a position between the first pipe portion 41 and the second pipe portion 42 in the axial direction of the valve device 1. The first restricting portion 51 restricts the flow of the cooling water between a space of the outside passage 81 on a side of the first pipe portion 41 and a space of the outside passage 81 on a side of the second pipe portion 42. In the present disclosure, the space of the outside passage 81 on the side of the first pipe portion 41 is referred to as a first outside passage portion 811, while the space of the outside passage 81 on the side of the second pipe portion 42 is referred to as a second outside passage portion 812.
In the present embodiment, the first restricting portion 51 completely blocks off the flow of the cooling water between the first outside passage portion 811 and the second outside passage portion 812. However, the first restricting portion 51 may have such a structure, according to which a gap is formed at any circumferential point between the first cylindrical member 31 and the outer-side middle-diameter portion 112 so that a part of the cooling water passes through the gap from the first outside passage portion 811 to the second outside passage portion 812, or vice versa. Therefore, the first restricting portion 51 may have any kinds of structures, according to which pressure loss of the cooling water in the outside passage 81 is increased between the first outside passage portion 811 and the second outside passage portion 812.
An outer peripheral end of the outwardly extending flange portion 312 of the first cylindrical member 31 is in contact with an inner peripheral wall of the outer-side large-diameter portion 111 of the outer jacket 10, at a position that is closer to an upper-side end of the outer jacket 10 on the injection-port opposite side of the first pipe portion 41. A contacting portion between the outwardly extending flange portion 312 and the outer jacket 10 works as the second restricting portion 52 for restricting the flow of the cooling water in the annular space 80. The second restricting portion 52 is formed in the circumferential direction at the position close to the upper-side end of the outer jacket 10. The second restricting portion 52 restricts the flow of the cooling water between the outside passage 81 and the inside passage 82.
A structure of the second restricting portion 52 is not limited to the above structure of the present embodiment, in which the outwardly extending flange portion 312 of the first cylindrical member 31 is in contact with the inner peripheral wall of the outer jacket 10. For example, as explained below in connection with a fifth embodiment, the second restricting portion 52 may be formed in such a manner that an upper-side end of the first cylindrical member 31 is in contact with an inner wall of the first inner-side step portion 214 of the inner jacket 20. Alternatively, the second restricting portion 52 may have such a structure, according to which the upper-side end of the first cylindrical member 31 is in contact with an outer peripheral wall of the inner-side middle-diameter portion 212 of the inner jacket 20.
In the present embodiment, the second restricting portion 52 completely blocks off the flow of the cooling water between the outside passage 81 and the inside passage 82. However, in a similar manner to the first restricting portion 51, the second restricting portion 52 may have such a structure, according to which a gap is formed at any circumferential point so that a part of the cooling water passes through the gap from the outside passage 81 to the inside passage 82, or vice versa. In other words, the second restricting portion 52 may have any kinds of structures, according to which the pressure loss of the cooling water is increased between the outside passage 81 and the inside passage 82, at the position of the upper-side end of the outer jacket 10, that is, at the upper side of the first pipe portion 41.
In the present embodiment, each of an outer peripheral wall of the first cylindrical member 31 and the inner peripheral wall of the outer jacket 10 has a cylindrical shape. More exactly, each of the outer peripheral wall of the first cylindrical body portion 311 of the first cylindrical member 31 and the inner peripheral wall of the outer-side middle-diameter portion 112 of the outer jacket 10, which form the first restricting portion 51, has the cylindrical shape. In addition, each of the outwardly extending flange portion 312 of the first cylindrical member 31 and the inner peripheral wall of the outer-side large-diameter portion 111 of the outer jacket 10, which form the second restricting portion 52, has the cylindrical shape. As a result, it is possible to assemble the first cylindrical member 31 to the outer jacket 10 by optionally selecting an angular position of the first cylindrical member 31 to the outer jacket 10. In other words, the first cylindrical member 31 is such a part, which can be assembled to the outer jacket 10 by rotating the first cylindrical member 31 relative to the outer jacket 10.
In the present embodiment, the first cylindrical member 31 is not in contact with the inner jacket 20. Therefore, the first cylindrical member 31 is also a part, which can be assembled to the outer jacket 10 by rotating the first cylindrical member 31 relative to the outer jacket 10 and the inner jacket 20. Furthermore, the first cylindrical member 31 is also a part, which can be assembled to the outer jacket 10 by rotating the first cylindrical member 31 relative to the second cylindrical member 32.
The second cylindrical member 32 has a second cylindrical body portion 321 and an outwardly extending flange portion 322, which is extending in the radial-outward direction from an upper-side end of the second cylindrical body portion 321. A compressed coil spring 33 is arranged between the outwardly extending flange portion 322 of the second cylindrical member 32 and the second outer-side step portion 115 of the outer jacket 10. The compressed coil spring 33 biases the outwardly extending flange portion 322 of the second cylindrical member 32 in an axial-upward direction, that is, in a direction to the inwardly extending flange portion 313 of the first cylindrical member 31. According to the above structure, the second cylindrical member 32 is fixed to the first cylindrical member 31 and the outer jacket 10. In a condition that the second cylindrical member 32 is fixed to the outer jacket 10 in the annular space 80, a first gap R is formed between a lower-side end of the second cylindrical member 32 and an inner wall of the outer-side bottom portion 12 of the outer jacket 10, so that the cooling water passes through the first gap R (between the outside passage 81 and the inside passage 82).
In the present disclosure, a part of the inside passage 82, which is a space formed inside of the first cylindrical member 31, is referred to as a first inside passage portion 821. Another part of the inside passage 82, which is a space formed inside of the second cylindrical member 32, is referred to as a second inside passage portion 822.
As shown in
As shown in
As shown in
In addition, the communication passage 60 is located at such a position of the upper side of the solenoid 72 in a vertical direction (a gravity direction), when the cooling device 1 is installed in the vehicle. In other words, the communication passage 60 is preferably located at the position of the upper side of the lower-side end 721 of the solenoid 72 in the vertical direction, when the cooling device 1 is installed in the vehicle. It is more preferable that the communication passage 60 is located at the position of the upper side of the upper-side end 722 of the solenoid 72 in the vertical direction, when the cooling device 1 is installed in the vehicle.
A positional range for providing the communication passage 60 in the cooling device 1 will be explained below.
As shown in
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In addition, as shown in
A condition, in which the cooling device 1 is installed in the vehicle (hereinafter, the vehicle-installed condition of the cooling device 1), will be explained. As shown in
As shown in
As indicated by the arrow A in
As indicated by the arrows D and E in
As explained above, in the present embodiment, the second restricting portion 52 prevents the cooling water from flowing from the first inside passage portion 821 to the first outside passage portion 811 by stepping across the outwardly extending flange portion 312. It is thereby so structured that the cooling water flows from the first inside passage portion 821 to the first outside passage portion 811 through the communication passage 60. The first cylindrical member 31 having the communication passage 60 can be assembled to the outer jacket 10 having the first pipe portion 41 and the second pipe portion 42 in such a way that an angular position of the first cylindrical member 31 to the outer jacket 10 can be optionally changed. Therefore, the first cylindrical member 31 can be assembled to the outer jacket 10 in such a way that the communication passage 60 is located at an upper position of the first cylindrical member 31 in the vertical direction. The upper position of the first cylindrical member 31 corresponds to one of circumferential positions of the first cylindrical member 31, which is higher in the vertical direction than a radially opposite circumferential position on the plane perpendicular to the center axis Ax. It is thereby possible to maintain the water surface of the cooling water in the annular space 80 at the higher position in the vertical direction.
The positional range of the communication passage 60 in the cooling device 1 will be explained.
Each of the
As shown in
The angle β around the center axis Ax between the position before the vehicle inclination and the position after the vehicle inclination is set to be, for example, 45°. Alternatively, the angle β may be set at a maximum inclination angle of the vehicle, in which the cooling device 1 is installed.
As shown in
A cooling device 100 of a comparative example will be explained to compare with the cooling device 1 of the first embodiment.
As shown in
In the cooling device 100 of the comparative example, the cooling water in the first inside passage portion 821 flows over across the upper-side end 314 of the first cylindrical member 31 to the first outside passage portion 811 and the cooling water is discharged from the cooling device 100 through the first pipe portion 41, when the center axis Ax is inclined with respect to the gravity direction. Therefore, the position of the water surface of the cooling water in the annular space 80 is changed depending on the angular position of the first pipe portion 41 around the center axis Ax.
In
A horizontal axis of
In addition, a solid line M in
As indicated by the solid line M, in the cooling device 100 of the comparative example, the level of the water surface of the cooling water is changed depending on the angular position of the first pipe portion 41 around the center axis Ax of the cooling device 100. In particular, when the angular position (the angle α) of the center axis 43 of the first pipe portion 41 is in a range between “+90°” and “+270°”, the level of the water surface of the cooling water becomes lower than the height of the lower-side end 721 of the solenoid 72. Therefore, it becomes difficult to effectively cool down the solenoid 72 in such an angular range. An operating performance of the injection valve 70 may become worse.
On the other hand, as indicated by the dotted line N in
As already explained above, the communication passage 60 is provided at the position higher than the lower-side end 721 of the solenoid 72. As a result, the level of the water surface of the cooling water is higher than that of the lower-side end 721 of the solenoid 72, in the first embodiment. It is therefore possible in the cooling device 1 of the first embodiment to sufficiently cool down the solenoid 72 of the injection valve 70, to thereby avoid the situation that the operational performance of the injection valve 70 becomes worse.
The cooling device 1 of the first embodiment has the following advantages.
(A1) In the present embodiment, the first restricting portion 51 restricts the flow of the cooling water flowing from the second outside passage portion 812 to the first outside passage portion 811. The second restricting portion 52 restricts the flow of the cooling water, which would otherwise step across the outwardly extending flange portion 312 of the first cylindrical member 31 and would flow from the first inside passage portion 821 to the first outside passage portion 811. The communication passage 60 communicates the first inside passage portion 821 and the first outside passage portion 811 to each other. According to the above structure, the cooling water flows from the first inside passage portion 821 to the first outside passage portion 811 through the communication passage 60. When the cooling device 1 is installed in the vehicle in such a way that the communication passage 60 is located at the upper position, it is possible to maintain the level of the water surface of the cooling water at the higher position in the annular space 80 and to increase the cooling performance to the injection valve 70.
(A2) In the present embodiment, the communication passage 60 is formed in the cylindrical partitioning unit 30, which can be rotated relative to the outer jacket 10 when it is assembled.
According to the above structure, the cylindrical partitioning unit 30 can be assembled to the outer jacket 10 depending on a change of the circumferential position of the outer jacket 10 in the vehicle-installed condition of the cooling device. In other words, the cylindrical partitioning unit 30 can be assembled to the outer jacket 10 in such a way that the communication passage 60 is located at the upper position. As a result, it is possible to locate the position of the water surface in the annular space 80 at the higher position. It is, therefore, possible to optionally change the position of the communication passage 60 depending on the vehicle-installed condition of the cooling device, without changing designs for shapes of the respective parts. Accordingly, it is possible to increase flexibility for installing the cooling device in the vehicle.
(A3) In the cooling device 1 of the present embodiment, the inner jacket 20 is provided at the outer periphery of the injection valve 70. The cylindrical partitioning unit 30 can be assembled to the cooling device 1 by rotating the same relative to the inner jacket 20 and the outer jacket 10.
Since the inner jacket 20 is provided in the cooling device 1, it is possible to cool down the injection valve 70, even when it does not have the water-proof function. Even in this case, it is possible to maintain the level of the water surface in the annular space 80 at the higher position, when the cylindrical partitioning unit 30 is assembled to the cooling device depending on the vehicle-installed condition in such a way that the communication passage 60 is located at the upper position.
(A4) In the present embodiment, the communication passage 60 is formed at the upper side of the solenoid 72, which is a part of the electromagnetic driving portion of the injection valve 70.
When the solenoid 72 of the injection valve 70 is located at the upper side of the injection port 71 in the vehicle-installed condition, the communication passage 60 is located at the upper side of the solenoid 72. Therefore, since the water surface in the annular space 80 is located at the upper side of the solenoid 72, it is possible to increase the cooling performance of the cooling device 1 to the injection valve 70.
(A5) In the present embodiment, the communication passage 60 is located at the position above the solenoid 72 of the injection valve 70 in the gravity direction, in the vehicle-installed condition.
Since the water surface in the annular space 80 is located at the position above the solenoid 72 in the vehicle-installed condition, the cooling performance of the cooling device 1 to the injection valve 70 is increased.
(A6) In the present embodiment, when the angle α of the center axis 43 of the first pipe portion 41 around the center axis Ax of the cooling device 1 is within the range of “−90°<α<+90°”, the communication passage 60 is located at the position which satisfies the relationship of “−(α+β)<γ<α”.
In the above relationship, the angle γ indicates the center angle of the communication passage 60 around the center axis Ax of the cooling device 1 between the communication passage 60 and the gravity direction. The angle β indicates the angle around the center axis Ax of the cooling device 1 between the position before the vehicle inclination and the position after the vehicle inclination, when the vehicle is inclined. For example, the angle β can be set at 45°. Alternatively, the angle β can be at such a value, which corresponds to the maximum inclination angle when the vehicle having the cooling device 1 is inclined.
According to the above structure, it is possible to locate the communication passage 60 at the upper position in the gravity direction, not only when the vehicle is horizontal on the road but also when the vehicle is inclined with respect to the gravity direction.
(A7) In the present embodiment, when the angle α of the center axis 43 of the first pipe portion 41 around the center axis Ax of the cooling device 1 is within the range of “+90°<α<+270°”, the communication passage 60 is located at the position which satisfies the relationship of “−90°<γ<+90°”.
According to the above structure, it is also possible to locate the communication passage 60 at the upper position in the gravity direction.
(A8) In the present embodiment, the communication passage 60 has the ellipsoidal shape, the length of which in the circumferential direction of the cylindrical partitioning unit 30 is larger than the length of the ellipsoidal shape in the axial direction of the cylindrical partitioning unit 30.
According to the above structure, it is possible to locate the lower-side end of the communication passage 60 at the higher position, while the opening area of the communication passage 60 can be increased. Accordingly, it is possible to decrease the pressure loss of the cooling water passing through the communication passage 60 and thereby to increase the flow amount of the cooling water. In addition, the level of the water surface can be increased. It is, therefore, possible to increase the cooling performance of the cooling device 1 to the injection valve 70.
In the following second to sixth embodiments, the structure of the communication passage is different from that of the communication passage 60 of the first embodiment. The other portions are the same to those of the first embodiment. Such portions which are different from those of the first embodiment will be explained.
As shown in
As shown in
As shown in
As shown in
In the fifth embodiment, the structure corresponding to the outwardly extending flange portion 312 of the first embodiment is not formed in the first cylindrical member 31. When the first cylindrical member 31 is assembled into the annular space 80 of the cooling device 1, the upper-side end 314 of the first cylindrical member 31 is brought into contact with the inner wall surface of the first inner-side step portion 214 of the inner jacket 20 in the axial direction. As shown in
In each of the above second to fifth embodiments, the cooling water in the annular space 80 also flows from the first inside passage portion 821 to the first outside passage portion 811, or vice versa, through the communication passage 60.
When the communication passage 60 is located at the upper position in the cooling device 1 depending on the vehicle-installed condition of the cooling device 1, it is possible to maintain the position of the water surface in the annular space 80 at the higher position in the vertical direction. The cooling performance of the cooling device 1 to the injection valve 70 can be thus increased.
In addition, in each of the above second to fifth embodiments, the communication passage 60 is formed in the cylindrical partitioning unit 30, which can be assembled to the outer jacket 10 by rotating the cylindrical partitioning unit 30 relative to the outer jacket 10. It is, therefore, possible to optionally change the position of the communication passage 60 depending on the vehicle-installed condition of the cooling device 1, without changing the design for the shapes of the respective parts. Accordingly, it is possible to increase the flexibility for installing the cooling device 1 in the vehicle. The same advantages to those of the first embodiment can be also obtained in each of the second to fifth embodiments.
In the cooling device 1 of a sixth embodiment, the communication passage 60 is formed in the inner jacket 20, which is different from the structure of the first to fifth embodiments. In
As shown in
In the sixth embodiment, the structure corresponding to the outwardly extending flange portion 312 of the first embodiment is not formed in the first cylindrical member 31. When the first cylindrical member 31 is assembled in the annular space 80 of the cooling device 1, the upper-side end 314 of the first cylindrical member 31 is brought into contact with the lower-side surface 214a of the first inner-side step portion 214 of the inner jacket 20. A portion of the upper-side end 314 of the first cylindrical member 31, which is in contact with the lower-side surface 214a of the first inner-side step portion 214, works as the second restricting portion 52 for restricting the flow of the cooling water in the annular space 80. The communication passage 60 is thereby formed between the lower-side surface 24a of the upwardly expanded portion 24 of the inner jacket 20 and the upper-side end 314 of the first cylindrical member 31.
In the cooling device 1 of the sixth embodiment, the cooling water in the annular space 80 flows from the first inside passage portion 821 to the first outside passage portion 811, or vice versa, through the communication passage 60. Since the communication passage 60 can be located at the higher position in the vertical direction depending on the vehicle-installed condition of the cooling device 1, it is possible to maintain the water surface in the annular space 80 at the higher position and thereby to increase the cooling performance for the injection valve 70.
In addition, in the sixth embodiment, the communication passage 60 is formed in the inner jacket 20, which can be assembled to the outer jacket 10 by rotating the inner jacket 20 relative to the outer jacket 10. It is, therefore, possible to optionally change the position of the communication passage 60 depending on the vehicle-installed condition of the cooling device 1, without changing the design for the shapes of the respective parts. Accordingly, it is possible to increase the flexibility for installing the cooling device 1 in the vehicle. The same advantages to those of the first embodiment can be also obtained in the sixth embodiment.
The present disclosure is not limited to the above embodiments but can be further modified in various manners without departing from a spirit of the present disclosure, for example, in the following ways.
(M1) In the above embodiments, the cooling device 1 is applied to the injection valve 70 for cooling down the same, wherein the injection valve 70 is used in the SCR system or used for regenerating the DPF. However, the cooling device 1 can be applied to any other types of the injection valves to be installed in the vehicle.
(M2) In the cooling device 1 of the above embodiments, the cooling water is supplied into the annular space 80 from the second pipe portion 42 and discharged from the first pipe portion 41. However, the cooling device can be so modified that the cooling water is supplied into the annular space 80 from the first pipe portion 41 and discharged from the second pipe portion 42.
(M3) In the above embodiments, the cylindrical partitioning unit 30 is composed of the first cylindrical member 31 and the second cylindrical member 32. However, it may be so modified that the cylindrical partitioning unit 30 is composed of only the first cylindrical member 31 and the second cylindrical member 32 is eliminated. Alternatively, the first and the second cylindrical members 31 and 32 may be integrally formed with each other.
(M4) In the above embodiments, each of the first cylindrical member 31 and the outer jacket 10 is formed in the cylindrical shape having a circular cross section. However, each of the first cylindrical member 31 and the outer jacket 10 is so formed that each of cross sectional shapes on a plane perpendicular to the axial direction has a polygonal shape. When the first cylindrical member 31 of such a modified shape is assembled to the outer jacket 10, the first cylindrical member 31 is rotated around its center axis by a predetermined angle, in a stepwise manner, relative to the outer jacket 10.
(M5) In the above embodiments, the first restricting portion 51 is formed by press-inserting the first cylindrical member 31 into the outer jacket 10. However, the first restricting portion 51 may be so formed by providing a separate member between the outer jacket 10 and the first cylindrical member 31.
(M6) In the above embodiments, the second restricting portion 52 is formed by bringing the first cylindrical member 31 into contact with the outer jacket 10 or the inner jacket 20. However, the second restricting portion 52 may be so formed by providing a separate member between the outer jacket 10 and the first cylindrical member 31 or between the inner jacket 20 and the first cylindrical member 31.
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JP2019-026883 | Feb 2019 | JP | national |
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Number | Date | Country | |
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20200263579 A1 | Aug 2020 | US |