JP5111292B2 - Liquid ejector for automobile - Google Patents

Description

  The present invention relates to a liquid discharge device in an automobile, and more particularly to a liquid discharge device in an automobile that can prevent loosening of a drain plug that opens and closes a drain port.

  2. Description of the Related Art Conventionally, in a motor vehicle, a cooling water discharge device 50 for discharging cooling water from its cooling water circulation system, as shown in FIG. 6, is provided at the bottom of a cooling water jacket (not shown) in a cylinder block 42 of an internal combustion engine 41, specifically. The thermostat case 43 is disposed slightly above the thermostat case 43. The thermostat case 43 includes a radiator water inlet 43a into which cooling water from a radiator (not shown) flows in, a heater water inlet 43b into which cooling water flows through a heater (not shown), and a chain of cooling water that flows in. And an outlet 43c that flows out toward the suction port of the water pump 45 disposed in the case 44. While the cooling water temperature is low, the radiator water inlet 43a is closed and the cooling water is circulated without passing through the radiator. When the water temperature becomes equal to or higher than a predetermined temperature, the radiator water inlet 43a is opened and the cooling water is circulated through the radiator.

  As shown in FIG. 7, the cooling water discharge device 50 has a configuration in which a drain cock body 52 is screwed and fixed to a drain port 51 formed in the cylinder block 42, and a drain plug 53 is screwed to the drain cock body 52. It was said. This is because the seal configuration of the drain plug 53 is a metal touch system in which the seal surface 55 at the tip of the drain plug 53 is pressed against the seal seat 54 provided on the drain cock body 52 and sealed. This is because the drain plug 53 cannot be screwed directly into the cylinder block 42. The drain cock body 52 has a female thread 56 formed on the inner periphery of a large diameter portion 52a formed through a tapered seal seat 54, and the drain plug 53 has a seal surface 55 formed at the tip and a small diameter. A male screw 58 that is screwed into the female screw 56 of the drain cock body 52 via a portion 57, a hexagonal head 59 for rotation operation, and a hose connection port 60 that connects a discharge hose (not shown) are provided, and the shaft core An outflow passage 61 is perforated in the portion, and a communication port 62 that opens to the outer periphery of the small diameter portion 57 is provided at the tip thereof.

  In this cooling water discharge device, the drain plug 53 is screwed into the drain cock body 52 so that the seal surface 55 at the tip of the drain plug 53 is pressed against the seal seat 54 of the drain cock body 52 to ensure a sealed state. . When the cooling water is discharged, the drain plug 53 is loosened, so that the seal surface 55 is separated from the seal seat 54, and the cooling water passes through the gap between them and enters the small diameter portion 57 at the tip of the drain plug 53. It flows out to the outflow passage 61 from the formed communication port 62 and is appropriately collected in a tray (not shown) via a discharge hose (not shown) connected to the hose connection port 60.

  In addition, as a drain cock configuration in the radiator, a cylindrical drainage port is projected from the lower surface of the lower tank, and a small-diameter hole portion and a large-diameter hole portion in which an internal thread is formed at the opening end are provided on the inner periphery thereof, A large-diameter shaft that has a small-diameter shaft portion that fits into the small-diameter hole portion of the drain port and a large-diameter shaft that engages with the female screw in the middle portion of the drain plug inserted into the drain port. And an outflow passage is provided in the shaft portion of the large-diameter shaft portion, and a communication port communicating with the outflow passage is opened on the step surface between the small-diameter shaft portion and the large-diameter shaft portion. An arrangement in which an O-ring for sealing is arranged on the outer periphery of the tip of the shaft is known (for example, see Patent Document 1).

  Also in this drain cock, by screwing the drain plug, the small-diameter shaft portion of the drain plug is fitted into the small-diameter hole portion of the drain port, and a sealed state is secured by an O-ring interposed therebetween. . When draining the cooling water, loosen the drain plug and detach the small diameter shaft from the small diameter hole, so that the cooling water flows through the small diameter hole and flows out to the outflow passage through the drain plug communication port. To be discharged.

Also, a radiator water inlet into which cooling water from the radiator flows in, a bypass water inlet into which cooling water that bypasses the radiator flows in, and an outlet through which the flowing cooling water flows out toward the water pump suction port are provided. It is also known that a drain socket is provided in a thermostat case, and a drain cock that is opened and closed by a screw is provided in the drain socket (for example, see Patent Document 2).
Japanese Utility Model Publication No. 63-47750 Japanese Utility Model Publication No.57-11226

  However, the cooling water discharge device shown in FIG. 7 has a configuration in which the drain plug 53 is screwed to secure the seal, and therefore, the cooling water leaks due to vibration during driving of the automobile and repeated temperature changes, and cooling water leaks. There is a problem that it may occur. In particular, when the drain plug 53 or the drain cock body 52 is made of a resin, there is a problem that the occurrence frequency of the loosening is high and the risk of cooling water leakage is even greater. Further, Patent Document 1 and Patent Document 2 to which a screw-type drain plug is applied similarly have the same problem.

  Furthermore, in the cooling water discharge device 50 shown in FIG. 7, since the cooling water is disposed slightly above the thermostat case 43, the residual water ratio after discharging the cooling water is high. Since the drain cock body 52 is separately required, the number of parts is increased, the cost is increased, and the drain plug 53 is loosened and drained. If the drain plug 53 is loosened too much, the drain plug 53 drops and the cooling water cannot be collected in the tray. There are also problems such as poor workability due to leakage to the surroundings and the need for sufficient space in the longitudinal direction.

  SUMMARY OF THE INVENTION The present invention has been made in view of the above-described conventional problems, and an object thereof is to provide a liquid discharge device in an automobile that can be configured in a compact manner and has good workability without causing leakage of coolant such as cooling water leak due to looseness. And

The liquid drainage device in the automobile of the present invention is provided with a cylindrical drainage port at a required position of the liquid drainage system in the automobile, is inserted and disposed in the cylindrical drainage port, and is moved by sliding in the axial direction in the inserted state. A drain plug that switches between a closed position and an open position is provided, and the drain plug engages with a restriction portion formed on the drain plug in a state where the drain plug is located at the open position, thereby preventing the drain plug from coming out of the drain port. A regulating piece is provided at the drainage port, and the drain plug is engaged with the drainage port and the drain plug from both sides in the direction orthogonal to the axial direction with the drain plug positioned at the closed position. The clip body is provided with a shape that restricts relative movement of the clip body. One end of the clip body is openable so as to be openable and closable, and the clip body can be inserted into and removed from the drainage port in a direction perpendicular to the axial direction. Looking clip body The regulating piece between released the end arranged, and is obtained by placing the regulating piece and the clip body in overlapping positions in the axial direction.

  According to this configuration, since the drain plug is engaged with the drainage port in the axial direction via the clip body in the state where the drain plug is in the closed position, the drain plug moves in the axial direction due to vibration or repeated temperature change, and the liquid There is no risk of leakage and high reliability can be secured. When discharging the liquid, pull the clip body in the direction orthogonal to the axial direction, open one end of the clip body, and then remove the drain plug to the open position. By sliding and moving in the axial direction, liquid can be discharged, and at the open position, the regulating piece provided at the drainage port engages with the regulating part of the drain plug, preventing further drainage of the drain plug. Therefore, there is no risk that the liquid will be discharged unintentionally, and when urgently stopping the discharge, simply push or pull the drain plug toward the closed position and slide it in the axial direction. Therefore, workability is good, and the restriction piece is placed between the open ends of the clip body when viewed from the axial direction, so the arrangement position of the restriction piece and the clip body is placed at the position where it overlaps in the axial direction. However, since the regulating piece and the clip body do not interfere with each other, it is not necessary to set a long drainage port, and a compact configuration can be achieved, and space can be saved even when the drain is opened.

  Further, in the closed position, a part of the clip body is accommodated in a groove provided in the circumferential direction of the drain plug and engaged in the axial direction, and the restriction provided in the drainage port between the closed position and the open position. A part of the piece is accommodated in a guide groove provided in the axial direction of the drain plug, and is engaged in the circumferential direction so as to be movable in the axial direction. When the drain plug is engaged in the axial direction, the clip body is engaged with the circumferential groove at the closed position of the drain plug, so that the movement of the drain plug is surely prevented and no liquid leakage occurs, and the drain plug Since the regulating piece does not rotate by engaging with the guide groove while the valve moves between the closed position and the open position, liquid leakage from between the drain port and the drain plug hardly occurs, and the open position With the restriction piece engaged with the groove end of the guide groove, the drain plug moves further and drains Possible to prevent the break out, it is possible to prevent the drainage leaking not be properly recovered.

  Also, if a thermostat case arranged at the bottom of the cooling water system in an automobile is provided with a drainage port and attached to the drainage port with the clip body opened upward, the thermostat case can also be used to reduce the number of parts. In addition, since the water is drained from the thermostat case located at the bottom of the cooling water system, the residual water rate can be reduced, and the operator can put his hand into the engine room from the bottom of the vehicle to attach and detach the clip body. By inserting, the clip body can be easily attached to and detached from the drainage port located near the lowermost part of the internal combustion engine, and the workability is also good.

  According to the present invention, the drain plug is engaged in the axial direction with the drainage port via the clip body in the state where the drain plug is in the closed position, so that the drain plug moves in the axial direction due to vibration or repeated temperature changes. There is no risk of liquid leakage, high reliability can be secured, and when discharging the liquid, the liquid is discharged by removing the clip body and then sliding the drain plug in the axial direction to the open position. In addition, the restricting piece provided at the drainage port at the open position engages with the restricting portion of the drain plug to prevent further drainage of the drain plug, so that liquid may be discharged unintentionally. Since the control piece is arranged between the open ends of the clip body when viewed from the axial direction, the control piece interferes with the clip body without setting a long drainage port. Without Can be configured compact, also the time of drain opening also can be saved space.

  Hereinafter, a cooling water discharge device for an automobile according to an embodiment of the present invention will be described with reference to FIGS.

  In FIG. 1, 1 is an internal combustion engine, 2 is a cylinder block, 3 is a cylinder head joined to the upper surface of the cylinder block 2, 4 is an oil pan joined to the lower surface of the cylinder block 2, and 5 is a cylinder head 3. A chain case 6 joined to the front surface between the cylinder block 2 and the oil pan 4 and a cylinder head cover 6 covering the cylinder head 3 and the upper surface of the chain case 5. The chain case 5 is provided with a water pump 7 that circulates cooling water at a position corresponding to the lower side of the cylinder block 2. A thermostat case 8 is joined to an inlet port of the water pump 7 that opens toward the rear of the vehicle.

  The thermostat case 8 includes a radiator water inlet 8a into which cooling water from a radiator (not shown) flows, a heater water inlet 8b into which cooling water that has passed through a heater (not shown) flows, and water that flows into the water. And an outlet 8c that flows out toward the suction port of the pump 7. While the cooling water temperature is lower than a predetermined temperature, the radiator water inlet 8a is closed and the cooling water is circulated without passing through the radiator (not shown). When the water temperature becomes a predetermined temperature or higher, the radiator water inlet 8a is opened, and the cooling water is circulated through a radiator (not shown). A cooling water discharge device (liquid discharge device) 9 is disposed below the thermostat case 8.

  The structure of the thermostat case 8 provided with the cooling water discharge device 9 will be described with reference to FIGS. As shown in FIGS. 2 and 3, the thermostat case 8 is configured by forming a dome-shaped portion 11 having a smaller diameter than the cylindrical main body portion 10 at one end of the cylindrical main body portion 10. The other end of the cylindrical main body portion 10 is opened to form an outlet 8c, a joining flange 12 for the water pump 7 is formed on the outer periphery thereof, and a sealing groove for arranging a sealing material so as to surround the outlet 8c 13 is provided. The dome-shaped portion 11 is provided with a cylindrical connection port 14 that forms the radiator water inlet 8a so as to protrude from the peripheral wall in a substantially tangential direction. Further, a cylindrical connection port 15 that forms the heater water inlet 8 b protrudes from a portion of the peripheral wall of the cylindrical main body 10 adjacent to the dome-shaped portion 11. The connection port 15 is formed in a posture inclined toward the axis of the cylindrical main body 10 and toward the outlet 8c.

  An inclined step surface constituting a seal seat 16 is formed between the tubular main body 10 and the dome 11. A thermostat mechanism 17 is disposed in a portion adjacent to the dome-shaped portion 11 of the cylindrical main body portion 10. The thermostat mechanism 17 includes a valve body 18 that is pressed against and separated from the seal seat 16, a spring 19 that moves and urges the valve body 18 toward the seal seat 16, and cooling water from a heater (not shown). When the temperature exceeds a predetermined temperature, the temperature sensor 20 is configured to separate the valve element 18 from the seal seat 16 against the urging force of the spring 19, and the support member 21 that supports the spring 19 and the temperature sensor 20. Yes. The connection port 15 is formed so that cooling water from a heater (not shown) effectively circulates in contact with the temperature sensing unit 20. Further, the outer peripheral portion of the support member 21 is fixed to the peripheral wall of the cylindrical main body portion 10.

  A cooling water discharge device 9 is disposed in the vicinity of the other end of the cylindrical main body portion 10 of the thermostat case 8 having the above configuration. As shown in FIGS. 3 to 5, the cooling water discharge device 9 is inserted and disposed in a cylindrical drainage port (drainage port) 22 that protrudes from the peripheral wall of the cylindrical main body 10, and the drainage port 22. In addition, the drain plug 23 is switched between a closed position and an open position by sliding in the axial direction in the inserted state. The drain port 22 has a small-diameter hole portion 22a facing the inside of the cylindrical main body 10 and a large-diameter hole portion 22b on the outside thereof, and the drain plug 23 includes a small-diameter shaft portion 23a that fits into the small-diameter hole portion 22a. And a large-diameter shaft portion 23b fitted into the large-diameter hole portion 22b. An operation rod 24 is provided at the end of the large-diameter shaft portion 23b, and a cylindrical connection port 25 for connecting a drain hose (not shown) from the operation rod 24 protrudes.

  The drain plug 23 is formed with an outflow passage 26 having one end reaching the base half of the small-diameter shaft portion 23 a and the other end opening at the tip of the connection port 25 in the drain plug 23. Further, a sealing material 27a such as an O-ring that seals between the small-diameter shaft portion 23a and the small-diameter hole portion 22a is disposed on the outer periphery of the front-end-side half portion, and the outer periphery of the end portion on the small-diameter shaft portion 23a side A sealing material 27b such as an O-ring for sealing between the large-diameter hole portion 22b is disposed. One end of the outflow passage 26 is opened on the outer peripheral surface of the half portion of the small-diameter shaft portion 23a on the large-diameter shaft portion 23b side through a communication passage 28 penetrating in the radial direction.

  Thus, as shown in FIGS. 3 and 4, when the drain plug 23 is inserted into the drain port 22 and pushed into the closed position at the far end, the small-diameter shaft portion 23a is fitted into the small-diameter hole portion 22a and the seal between the two is sealed. Sealed by the material 27a, the cooling water does not flow out. On the other hand, when the drain plug 23 is slid in the axial direction using the operation lever 24 and the drain plug 23 is pulled out to the open position with respect to the drain port 22, the small diameter shaft portion 23a is completely extracted from the small diameter hole portion 22a. The cooling water flows into the large-diameter hole portion 22b through the small-diameter hole portion 22a, and further flows out through the communication passage 28 and the outflow passage 26 formed in the drain plug 23, and is necessary for the connection port 25. It can collect | recover in the tray arrange | positioned in the appropriate place through the drainage hose (not shown) connected according to it.

  Further, in order to prevent the drain plug 23 from moving unexpectedly in the pulling-out direction and the cooling water from leaking in a state where the drain plug 23 is located at the closed position, the circumferential direction is formed on both sides of the drain port 22 near the tip. The slit groove 29 is formed, an annular engagement groove 30 is formed at a corresponding position of the drain plug 23, and a substantially U-shaped clip body 31 whose one end is openable and closable is formed by the slit groove. 29 and the engaging groove 30 are fitted and engaged from both sides. The clip body 31 is made of a spring material. The clip body 31 can be easily attached by pushing the clip body 31 from below the drain port 22, and the one end 31 a is opened in a C shape so that the attachment state is maintained. An arcuate portion 31b that fits in a press-contact state with the bottom surface of the engagement groove 30 of the drain plug 23 is formed in the portion.

  The drain plug 23 has a guide groove having a length corresponding to the distance between the closed position and the open position so that the drain plug 23 slides without rotating when the drain plug 23 moves from the closed position toward the open position. 32 is formed up and down from the annular engagement groove 30 toward one end side of the drain plug 23, and the upper surface of the drain outlet 22 corresponding to the end position of the guide groove 32 adjacent to the engagement groove 30. A restricting pin 33 as a restricting piece is driven so as to enter the guide groove 32 from above. Thereby, when the drain plug 23 is pulled out to the open position, the regulation pin 33 is engaged with the groove end 32a of the guide groove 32, thereby preventing the drain plug 23 from being unexpectedly further pulled out from the open position. Further, since the regulation pin 33 is disposed between the open one end portions 31a and 31a of the clip body 31 when viewed from the axial direction and does not interfere with each other, the regulation pin 33 and the clip body 31 are viewed from the side. Are slightly offset in the axial direction but are arranged so as to overlap substantially the same position, and the drain port 22 is configured to be compact in the axial direction. The lower axial groove 32 is not functionally necessary, but is formed in order to form the drain plug 23 symmetrically for manufacturing reasons.

  According to the cooling water discharge device 9 having the above configuration, as shown in FIGS. 3 and 4, the small-diameter shaft portion 23 a of the drain plug 23 serves as the small-diameter hole of the drain port 22 when the drain plug 23 is located at the closed position. Since it fits in the part 22a and is sealed with the sealing material 27a, the cooling water flowing through the cylindrical main body part 10 of the thermostat case 8 does not flow out to the outside. In this state, the clip body 31 is fitted and engaged with both the slit groove 29 formed in the drain port 22 and the engagement groove 30 formed in the drain plug 23, and the drain port 22 and the drain plug 23 are interposed via the clip body 31. Since the drain plugs 23 are moved in the axial direction due to vibrations and repeated temperature changes, there is no risk of water leakage, and water leakage from the cooling water discharge device 9 is prevented. High reliability can be secured.

  Further, when the cooling water is discharged from the cooling water discharge device 9, the clip body 31 is pulled downward in the direction orthogonal to the axial direction, and the one end 31a is opened and separated from the slit groove 29 and the engagement groove 30, and then the operation is performed. By sliding the drain plug 23 in the axial direction to the open position using the flange portion 24, the cooling water flows out into the large diameter hole portion 22 b through the small diameter hole portion 22 a and is further formed in the drain plug 23. Since it flows out through the communication passage 28 and the outflow passage 26, it can be discharged to a proper place through a drainage hose (not shown) connected to the connection port 25 as necessary. Further, in a state where the drain plug 23 is pulled out to the open position, the restriction pin 33 provided in the drain port 22 engages with the groove end 32a of the guide groove 32 provided in the drain plug 23, and the drain plug 23 is further pulled out. The workability is good because there is no risk that it will be blocked and accidentally dropped and the cooling water will be discharged unintentionally. Further, when it is necessary to stop the discharge urgently during the discharge of the cooling water, the drain plug 23 can be simply pushed toward the closed position and slid in the axial direction, so that the workability is further improved.

  Further, the restriction pin 33 is fitted into the guide groove 32 from the upper surface of the drain port 22 so as to be disposed between the open ends 31 a and 31 a of the clip body 31 when viewed from the axial direction of the drain port 22 and the drain plug 23. Since the restriction pin 33 and the clip body 31 are arranged so as not to interfere with each other even if the restriction pin 33 and the clip body 31 are arranged at positions overlapping in the axial direction, the drain port 22 is made long. It is not necessary to set, and the cooling water discharge device 9 can be made compact.

  Further, while the drain plug 23 moves between the closed position and the open position, the restriction pin 33 provided in the drain port 22 is circumferentially movably moved in the axial direction in the guide groove 32 provided in the drain plug 23 in the axial direction. Since the drain plug 23 does not rotate while moving between the closed position and the open position, the large diameter hole portion 22b of the drain port 22 and the large diameter shaft portion 23b of the drain plug 23 are engaged. The sealing action of the sealing material 27b interposed between the two is ensured and there is no risk of water leakage.

  In the present embodiment, the cooling water discharge device 9 is provided by forming the drain port 22 in the thermostat case 8 provided at the lowermost part of the cooling water system in the internal combustion engine 1. A part of the constituent elements of 9 can be used also as the thermostat case 8 to reduce the number of parts and to reduce the residual water rate after discharge. Moreover, since the clip body 31 opened upward with respect to the drain port 22 of the thermostat case 8 disposed at the lowermost part of the cooling water system is inserted and removed from below, the clip body 31 can be attached and detached. When the operator puts his hand into the engine room from the lower side of the vehicle, the clip body 31 can be easily attached to and detached from the drain port 22 located near the lowermost part of the internal combustion engine 1, and the workability is good.

  In the above description of the embodiment, an example in which the liquid discharge device (cooling water discharge device) 9 is disposed in the thermostat case 8 has been described. However, the liquid discharge device according to the present invention is limited to that disposed in the thermostat case 8. However, it may be disposed at an appropriate location of a liquid discharge system such as a cooling water circulation system in an automobile, for example, a radiator, etc., and if it is disposed at the lowest position of the liquid discharge system in particular, the residual water rate is reduced. Therefore, it is preferable.

  INDUSTRIAL APPLICABILITY The present invention can be suitably used for a cooling water discharge device of an automobile, a liquid discharge device of a lubricating oil circulation system such as an oil pan, a transmission, an oil cooler, and an oil warmer, a liquid discharge device of a drain drain of a fuel cell vehicle, etc. Moreover, it can utilize suitably.

The partial front view which shows schematic structure of the internal combustion engine provided with the cooling water discharge device of one Embodiment of this invention. The partial cross section front view of the thermostat case provided with the cooling water discharge device of the embodiment. AA arrow sectional drawing of FIG. BB arrow sectional drawing of FIG. (A) is CC arrow directional view of FIG. 2, (b) is DD arrow sectional drawing of (a). The partial front view which shows schematic structure of the internal combustion engine provided with the cooling water discharge device of the prior art example. The longitudinal side view of the cooling water discharge apparatus of a prior art example.

Explanation of symbols

1 Internal Combustion Engine 8 Thermostat Case 9 Cooling Water Discharge Device 22 Drainage Port (Drainage Port)
23 Drain plug 29 Slit groove 30 Engaging groove 31 Clip body 31a One end 32 Guide groove 32a Groove end (regulator)
33 Restriction pin (regulation piece)

Claims (3)

A cylindrical drainage port is provided at the required location of the liquid drainage system in automobiles,
A drain plug that is inserted into the cylindrical drainage port and is switched between a closed position and an open position by an axial sliding movement in the inserted state;
Provided regulating piece for preventing the drain plug engaged with the regulating portion drain plug is formed on the drain plug in a state located in the open position to get out to the outside of the drain port into the drain port ,
The relative axial movement of the drain plug is the drain port and the drain plug engaged to said drain port and the drain plug from both sides in a direction orthogonal to the axial direction in a state of being positioned in the closed position Provide clip body to regulate,
The clip body and removably from the one end in a shape having one end open to open in a direction perpendicular to the axial direction with respect to the drain port, and is opened in the clip body as viewed from the axial direction A liquid discharging apparatus for an automobile, wherein the regulating piece is disposed between one end , and the regulating piece and the clip body are arranged at positions overlapping in an axial direction . A cylindrical drainage port is provided at the required location of the liquid drainage system in automobiles,
A drain plug that is inserted into the cylindrical drainage port and is switched between a closed position and an open position by an axial sliding movement in the inserted state;
A regulating piece is provided at the drainage port that engages with a regulating part formed on the drain plug in a state where the drain plug is in the open position and prevents the drain plug from slipping out of the drainage port. ,
With the drain plug positioned at the closed position, the drain plug and the drain plug are engaged with each other from both sides in the direction orthogonal to the axial direction to move the drain plug and the drain port in the axial direction. Provide clip body to regulate,
The clip body is open at one end so that it can be opened and closed, and can be inserted / removed from the one end side in a direction perpendicular to the axial direction with respect to the drainage port, and the clip body is opened as viewed from the axial direction. Placing the regulating piece between one end,
In the closed position, the portion of the clip body is accommodated in a groove provided in the circumferential direction on the drain plug engages in the axial direction,
Between a closed position and an open position, engaging the movable circumferentially said portion of the regulating piece provided in the drain port is received in the guide groove provided in the axial direction to the drain plug in the axial direction Together
In the open position, the liquid discharge apparatus in automotive you wherein a portion of the regulating piece is engaged in the axial direction to the regulating unit consisting of the guide groove end. A cylindrical drainage port is provided at the required location of the liquid drainage system in automobiles,
A drain plug that is inserted into the cylindrical drainage port and is switched between a closed position and an open position by an axial sliding movement in the inserted state;
A regulating piece is provided at the drainage port that engages with a regulating part formed on the drain plug in a state where the drain plug is in the open position and prevents the drain plug from slipping out of the drainage port. ,
With the drain plug positioned at the closed position, the drain plug and the drain plug are engaged with each other from both sides in the direction orthogonal to the axial direction to move the drain plug and the drain port in the axial direction. Provide clip body to regulate,
The clip body is open at one end so that it can be opened and closed, and can be inserted / removed from the one end side in a direction perpendicular to the axial direction with respect to the drainage port, and the clip body is opened as viewed from the axial direction. Placing the regulating piece between one end,
It said drain port to a thermostat casing disposed at the bottom of the cooling water system provided in an automobile, the liquid in the automotive you characterized in that the clip member attached in a state of open upward to said drain port Discharging device.

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