JP6003095B2 - Water pump - Google Patents

Description

  The present invention relates to a water pump that circulates cooling water for cooling an internal combustion engine.

  Conventionally, a water pump is used to circulate a fluid in order to cool the engine with a fluid (for example, water) with respect to the internal combustion engine (engine). In this case, water used as the fluid cools. Hereinafter, it is referred to as cooling water.

  The configuration of the water pump includes, for example, a body fixed to the engine body, a rotating shaft that is rotatably supported inside the body via a bearing, and an impeller provided at one end of the rotating shaft, and the impeller is a motor. The cooling water is circulated inside the engine by rotating the motor. In the conventional water pump, a seal member is provided between the impeller and the bearing, and cooling water (water droplets) leaking from the impeller side through the seal member below the body is passed through the drain hole to the outside of the body. There is a known structure of a water pump in which a drain port for discharging to the outside is opened on the mounting surface on the engine block side (see Patent Document 1).

JP 2002-285998 A

  However, the above-described conventional water pump has a configuration in which the drain port continuous to the water reservoir directly opens to the outside. For this reason, it is easy for foreign matter to enter from the outside where the drain port is formed, and foreign matter enters from the outside and a part of the discharge path to the outside of the cooling water (for example, but not limited to this, the drain port) is blocked. The cooling water gradually accumulates in the water reservoir through the drain hole. Then, the cooling water gradually accumulates in the water reservoir, and a backflow can occur in the cooling water discharge path. If cooling water accumulates around the rotating shaft that rotates the impeller, it will affect the rotation of the impeller. Therefore, the cooling water transmitted through the drain hole is effectively discharged to the outside. It is necessary to take measures.

  Accordingly, the present invention has been made in view of the above-described problems, and the cooling water leaked around the rotating shaft from the pump side where the impeller is provided, because foreign matter enters from the outside as the outlet of the drain port as in the prior art. It is an object of the present invention to provide a water pump that accumulates in a water reservoir provided below the rotating shaft and does not flow backward from the water reservoir and affect the rotation of the impeller.

The technical means taken in order to solve the above-described problem includes a body having a first space communicating with the suction port and the discharge port, and is rotatably supported inside the body via a rotation shaft. An impeller that circulates cooling water present in the space; a seal member that seals the cooling water present in the first space around the rotation shaft; and the rotation shaft that is opposite to the first space via the seal member. A water reservoir for storing cooling water leaked into the second space formed around the lower portion of the rotating shaft, a fixing member to which the body is fixed, and the fixing member and the body are coupled at a coupling portion. The coupling member is a bolt having a head portion that contacts the end surface of the fixing member, and a screw portion that is screwed into the mounting hole of the body, and leaked cooling that accumulates in the water reservoir. mounting holes to water in the body It was configured to be discharged to the outside through.

  Moreover, it is good for the said connection member to be led to the position of the said head which exhibits a flange shape, and to make it the structure discharged | emitted outside.

A body having a first space communicating with the suction port and the discharge port; an impeller that is rotatably supported inside the body via a rotating shaft and circulates the cooling water existing in the first space; A seal member that seals the cooling water existing in the first space around the rotation shaft, and leaks to the second space formed around the rotation shaft on the opposite side of the first space via the seal member. And a coupling member that couples the fixing member and the body at a coupling portion. The coupling member is a knock pin. It is preferable that the leaked cooling water accumulated in the water reservoir is guided to the position of the knock pin and discharged to the outside along the outer shape of the knock pin.

The water pump of the present invention guides the cooling water that has accumulated and leaked in the water reservoir to a coupling portion that couples the body and the fixing member, and discharges the cooling water to the outside through a mounting hole between the screw portion of the coupling member and the body in the coupling portion. Since it was set as the structure, the exit of the leaked cooling water is obstruct | occluded by the coupling member. For this reason, it can prevent that a foreign material etc. enter from the exit of a discharge path like the past. Therefore, it is possible to prevent a part of the leakage water from being clogged by foreign substances in the discharge path of the leaked cooling water, and to prevent the cooling water leaking in the direction of the rotation axis from flowing backward. Since it is possible to prevent the backflow of cooling water leaked by using a coupling member that is connected to the member, it is possible to prevent backflow by devising the discharge path of the leaked cooling water without increasing the number of parts. Can be performed with a simple configuration.

  In this case, the leaked cooling water can be effectively discharged to the outside without increasing the number of parts compared to the prior art by using the bolt heads or screw parts necessary for fastening to the fixing member of the body. Is possible.

  In addition, if the coupling member is configured to lead to the position of the head having a flange shape and discharge to the outside, the cooling water leaked along the flange-shaped end surface can be effectively externalized using the flange-shaped end surface. Can be discharged from a hidden position that is not visible from the outside.

  In addition, the coupling member is a knock pin, and if the leaked cooling water is guided to the position of the knock pin and discharged to the outside along the outer shape of the knock pin, the leaked cooling water is used by using a knock pin that is cheaper than the bolt. Can be discharged to the outside.

It is a front view of the water pump in 1st Embodiment of this invention. It is II-II sectional drawing shown in FIG. It is sectional drawing of the water pump in 2nd Embodiment used as the modification of FIG. It is sectional drawing of the water pump in 3rd Embodiment used as the modification of FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

(First embodiment)
A specific configuration in the first embodiment is shown in FIGS. 1 and 2.

  The water pump 1 circulates a fluid (for example, water, hereinafter referred to as cooling water) inside the engine to cool the hot engine (for example, a cylinder head) with respect to the internal combustion engine (engine). Used to do. The water pump 1 has an outer shape formed by sealing a gap between a body 4 forming a skeleton and a timing chain cover (fixing member) 3 with a gasket 2. The body 4 has a cylindrical hollow boss portion 24 at the center, the timing chain side (the right side shown in FIG. 2) has a large diameter from the boss portion 24, and a concave shape is formed inside the large diameter portion. The first space 25 is provided. The first space 25 communicates with a suction port 14 and a discharge port 17 which will be described later, serves as a pump chamber 5 that sucks cooling water from the suction port 14 and discharges it from the discharge port 17, and supports a rotating shaft in the hollow interior of the boss portion 24. A hole 6 is formed. The rotary shaft 7 is rotatably supported by the boss portion 24 via a bearing 8 having an annular shape in the rotary shaft support hole 6. In this case, an annular seal member 9 is provided around the rotary shaft 7 on the pump chamber side in order to make the first chamber 25 liquid-tight on the pump chamber 5 side. The second space 26 that partitions the periphery (specifically, between the seal member 9 and the bearing 8) is sealed. Further, on the opposite side of the rotating shaft 7 from the side where the impeller 11 is provided, a disk-like pulley 10 that is rotated by a timing belt (not shown) from a crankshaft (not shown) is rotatable. The vane-like impeller 11 that is fixed and provided inside the pump chamber 5 is rotated by the rotation of the pulley 10, and the cooling water existing in the pump chamber 5 can be circulated inside the engine.

  Cooling water that leaks from the first space 25 to the second space 26 through the seal member 9 that performs a sealing function from the pump chamber 5 (herein referred to as leaked cooling water) is supplied to the body 4. A drain hole 12 is formed to discharge from the central position of the second space 26 downward. Further, the boss portion 24 has a steam vent hole 13 in the body 4 through which the cooling water leaked in the second space becomes hot when the pump is driven (when the impeller 11 rotates) and the steamed cooling water can be discharged into the atmosphere. It is formed through the body 4 at a position directly above the formed drain hole 12.

  The drain hole 12 has a pipe line extending downward (vertically below) in the vertical direction, and a space (water reservoir 21) widened in communication with the drain hole 12 below the drain hole 12 is a body. The first water reservoir 21a and the second water reservoir 21b are juxtaposed in parallel with the boss 24 of the four bosses 24 and formed in the body 4 via the communication passage 21c (the first water reservoir 21a). , The second water reservoir 21b) is a space for storing the leaked cooling water in two stages through the drain hole 12, and a recess formed below the first space 25 of the body 4 is used as a wall surface. It is formed fluid-tight with one side surface of the gasket 2 for sealing. As shown in FIG. 1, the first water reservoir 21a accumulates from the bottom surface (not shown) and flows to the communication passage 21c from the first water reservoir 21a when the water level reaches the height position where the communication passage 21c is formed. The body 4 is guided from 21c to the position of the coupling portion 20 where the body 4 is fixed to the fixing member 3, and a water discharge path is formed.

  As shown in FIG. 2, the timing chain cover 3 is configured such that a rotatable impeller 11 is rotatably maintained with a predetermined interval. The timing chain cover 3 has a recess that partitions the first space 25 together with the body 4, and a suction port 14 that sucks cooling water is formed in the center of the impeller 11 as a cooling water inlet that opens in the axial direction. . Cooling water is taken into the first space 25 from the suction port 14. The timing chain cover 3 has a flat portion that is in surface contact with the gasket 2 at a portion where the water reservoir 21 is formed in the body 4, and one wall surface of the first water reservoir 21 is formed by the gasket 2, and the second water reservoir 21b. The central portion of the bolt 4 (joint member) 30 having the head portion 31 having the flange portion 32 becomes the joint portion 20 into which the screw portion 33 is inserted, and the bolt 4 causes the body 4 to be fixed to the fixing member, that is, the timing chain cover 3. It is tightly coupled. As shown in FIG. 1, the bolts 30 are provided at four locations in the circumferential direction of the body 4 (two locations are possible) with the boss portion 24 as the center, and the body 4 is locked and fastened to the timing chain cover. .

  In the above configuration, the cooling water leaked from the first water reservoir 21a through the communication passage 21c is guided to the second water reservoir 21b formed at the position of the coupling portion 20 of the body 4. The leaked cooling water that has reached the second water reservoir 21b reaches the bottom surface 26 of the second water reservoir 21b and passes through the joint surface 28 between the flange portion 32 of the bolt 30 and the body 4 at the coupling portion 20 to the outside. It becomes the composition which discharges to. Cooling water that leaks through the joint surface 28 (for example, cooling water that oozes out, but is not limited to this) is efficiently discharged to the outside 16 with a simple configuration without increasing the number of parts as compared with the conventional case. be able to.

  Next, the operation of the present invention will be described.

  In the engine driving state, the timing belt (not shown) is driven by the rotational movement of the crankshaft (not shown) of the engine. When the timing belt is driven, the pulley 10 to which the timing belt is applied is rotationally driven, and the rotating shaft 7 that rotates integrally with the pulley 10 and the blade-like impeller 11 provided on one of the rotating shafts 7 rotate together. In this case, the cooling water present in the pump chamber of the first space 25 is sucked from the suction port 14, circulated by the rotation of the impeller 11, and pumped to the discharge port 17. In such an operation process, the seal member 9 is provided to seal the rotating shaft 7, but cooling water leaks from the seal member 9 to the second space 26 opposite to the first space 25 over time. It can occur with it. Thus, when the situation where the sealing member 9 does not sufficiently perform the sealing function occurs, the cooling water leaked from the pump chamber side to the second space 26 passes through the drain holes 12 formed below the second space 26. It passes through the water reservoir 21 by its own weight, and then accumulates in the widened space, that is, the first water reservoir 21a. In this case, the cooling water that has been heated by the pump drive and turned into water vapor in the second space 26 is discharged to the outside 16 through the vapor vent hole 13 opened above the boss portion 24.

  The cooling water leaked through the drain hole 12 is accumulated from the bottom surface of the first water reservoir 21a. When the water level reaches the position where the communication hole 21c is formed, the second water reservoir 21b passes through the communication hole 21c. Led to. From the second water reservoir portion 21 b formed in the joint portion 20 of the body 4, it is discharged to the outside 16 through a joint surface 28 formed on the back surface of the flange portion 32 of the body 4 and the bolt 30. At this time, the joint surface 28 may be provided with a clearance of about several millimeters on the outer side 16 so as to discharge the cooling water that oozes out. In the first embodiment, since the outlet is not opened in the discharge path for discharging the coolant leaked to the outside 16 and is closed on the back surface of the flange portion 32, foreign substances from the outside are placed inside the water discharge path. Never invade.

  The water pump 1 according to the present invention guides cooling water accumulated in the water reservoir 21 formed below the rotary shaft 7 through the drain hole 12 to a position where the bolt 30 is provided, and the flange portion 32 of the bolt 30. By using the back surface of the flange portion 32 and the joint surface 28 between the back surface of the flange portion 32 and the body 4, it can be effectively discharged to the outside 16.

  In this case, since the outlet of the discharge path to the outside 16 of the leaked cooling water is closed, foreign matter enters the water reservoir 21, or foreign substances are clogged in the discharge path, Backflow through the discharge path due to the influence of the clogged foreign matter can be suppressed with a simple configuration.

(Second Embodiment)
Next, with reference to FIG. 3, the structure of 2nd Embodiment which is a modification of FIG. 2 is demonstrated.

  The configuration up to the water reservoir 21 in the discharge path of the coolant that has leaked out from the water pump 1a shown in the second embodiment is the same as that in the first embodiment, and a detailed description thereof is omitted here. The difference from the first embodiment is that in the first embodiment, the body 3 is attached to the timing chain cover 3 which is a fixing member by a bolt 30, and the back surface of the flange portion 32 of the bolt 30 and the body 4. The second embodiment is different in that the bolt 30 is fastened from the timing chain cover side to the configuration in which the cooling water leaked from the joint surface 28 is discharged.

  In FIG. 3, the timing chain is not provided on the body side with the second water reservoir 21b shown in the first embodiment as shown in FIG. 2, and communicates with the communication passage 21c communicating with the first water reservoir 21a. A mounting hole 39 through which the screw portion 34 of the bolt 30 having a head portion 33 having a flange portion 37 attached from the cover side is inserted is formed, and externally through a joint surface 38 between the mounting hole 39 and the screw portion 34. It is also possible to have a configuration of discharging to 16. In this case, the timing chain cover 3 is provided with a mounting hole 36 having a diameter twice the diameter of the screw portion 34 at a position where the bolt 30 is provided, and the communication path 21 c and the mounting hole 36 are sealed by the gasket 2. It has become.

  The operation and effect of the second embodiment will be described. According to the configuration described above, the coupling portion into which the bolt 30 is inserted from the first water reservoir portion 21a through the communication passage 21c by the cooling water leaked from the first space 25 to the second space 26 due to the secular change caused by the engine drive. 20, and can be discharged to the outside 16 by a joint surface 38 between the mounting hole 39 through which the screw portion 34 of the bolt 30 is inserted and the screw portion 34. In this case, the flange portion 37 of the bolt 30 is in contact with the end face of the coupling portion 20 by the mounting hole 36 of the timing chain cover 3, and is sealed from the timing chain cover side by the gasket 2 from the first water reservoir portion 21 a. Therefore, the entry of foreign matter from the contact surface 38 between the back surface of the flange portion and the timing chain cover can be reliably prevented with a simple configuration without increasing the number of parts.

  The timing chain cover 3 and the body 4 are fixed via the gasket 2 and can be discharged by forming a cooling water discharge path in the coupling portion 20, and the leakage leaked by a foreign matter clogged in part of the discharge path. There is no reverse flow of water.

  In addition, this invention is not limited to the said embodiment, It is also possible to change as shown below.

(Third embodiment)
In the first embodiment and the second embodiment, the body 4 is fastened to the timing chain cover 3 with the bolts 30 and the cooling water discharge path is guided to the position of the coupling portion 20 where the bolts 30 are provided. In the third embodiment, instead of using the bolt 30, a knock pin 40 that is less expensive than the bolt 30 may be used as shown in FIG.

  The knock pin is used in a connecting portion 20 (a position where the bolt 30 is provided in FIG. 2) for fastening the body 4 and the timing chain cover 3 together. The knock pin 40 is provided at a position connected to a communication path 42 connected to a first water reservoir 41 provided below the drain hole 12, and is attached to the mounting hole 44 formed in the body 4 from the communication path 42 and the timing chain cover 3. A cylindrical knock pin 40 may be attached to the attachment hole 46 formed at a position corresponding to the position of the attachment hole 44.

  In the above configuration, it is also possible to provide a slight clearance between the mounting hole 44 and the outer peripheral surface of the knock pin 40, and to discharge the leaked cooling water with an efficient and inexpensive configuration.

1 Water pump 3 Timing chain cover (fixing member)
4 Body 7 Rotating shaft 9 Seal member 11 Impeller 12 Drain hole 14 Suction port 16 External 17 Discharge port 20 Coupling portion 21 (21a, 21b), 41 Water reservoir portion 21c, 42 Communication path 24 Boss portion 25 First space 26 Second Space 28 Joint surface 30 Bolt (joining member)
31 Head 32 Flange (head)
33 Threaded part 40 Knock pin (coupling member)

Claims (3)

A body having a first space communicating with the suction port and the discharge port;
An impeller that is rotatably supported inside the body via a rotating shaft and circulates cooling water present in the first space;
A sealing member for sealing the cooling water present in the first space around the rotation axis;
A water reservoir for storing cooling water leaked into the second space formed around the rotary shaft on the opposite side of the first space via the seal member;
A fixing member to which the body is fixed;
A coupling member that couples the fixing member and the body at a coupling portion;
The coupling member includes an end surface of the fixing member abutting the head portion, wherein a bolt having a mounting hole and screwed to the threaded portion of the body, the mounting hole of said leaked cooling water accumulated in the water reservoir body A water pump that discharges to the outside.   The water pump according to claim 1, wherein the coupling member is guided to a position of the head having a flange shape and discharged to the outside. A body having a first space communicating with the suction port and the discharge port;
An impeller that is rotatably supported inside the body via a rotating shaft and circulates cooling water present in the first space;
A sealing member that seals the cooling water present in the first space around the rotating shaft;
A water reservoir for storing cooling water leaked into the second space formed around the rotation shaft on the opposite side of the first space via the seal member;
A fixing member to which the body is fixed;
A coupling member that couples the fixing member and the body at a coupling portion;
The water pump is configured such that the coupling member is a knock pin, and leaked cooling water accumulated in the water reservoir is led to the position of the knock pin and discharged to the outside along the outer shape of the knock pin.

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