JP6003094B2 - 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 through a bearing inside the body, and an impeller provided at one end of the rotating shaft, and rotates the impeller. The configuration is such that cooling water is circulated inside the engine by rotating a pulley provided on one side of the shaft by a drive belt (for example, a timing belt). 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 first technical measure taken to solve the above problems is as follows:
A body having a first space communicating with the suction port and the discharge port; an impeller which is rotatably supported in the body via a rotation shaft and circulates the cooling water existing in the first space; A seal member that seals cooling water existing in the space around the rotation shaft, and cooling leaked to the second space formed around the rotation shaft on the opposite side of the first space via the seal member a water reservoir for storing water below said rotary shaft, communicates with the water reservoir, the drain hole is formed which is open on one side, a first support member for supporting said body, said first support member A second support member disposed so as to abut one side surface and face the drain hole, and leaked cooling water collected in the water reservoir portion between the first support member and the second support member. A structure for discharging to the outside by the contact surface It was.

In addition, the second technical means taken to solve the above-described problems is:
A body having a first space communicating with the suction port and the discharge port; an impeller which is rotatably supported in the body via a rotation shaft and circulates the cooling water existing in the first space; A seal member that seals cooling water existing in the space around the rotation shaft, and cooling leaked to the second space formed around the rotation shaft on the opposite side of the first space via the seal member A water reservoir that stores water below the rotating shaft, a first support member that serves as one wall when forming the water reservoir and supports the body, and leaked cooling water that accumulates in the water reservoir, And the first support member are discharged to the outside through a contact surface.

In the above-described configuration, the first support member defines the first space by covering the periphery of the impeller, and discharges the leaked cooling water to the outside along the contact surface. And good.

In the water pump of the present invention, a drain hole is formed in communication with the water reservoir, and a first support member that supports the body and a side surface of the first support member that is in contact with the drain hole are disposed. The cooling water that has accumulated and leaked in the water reservoir is discharged to the outside by the contact surface between the first support member and the second support member, so that the first support that supports the body is provided. The leaked cooling water can be discharged to the outside through the contact surface between the member and the second support member. In this case, since the opening of the drain hole formed in the first support member is arranged so that the second support member faces, it is possible to prevent foreign matter from entering from the drain hole opened as in the prior art. In addition, it is possible to prevent a part of the leakage path of the cooling water from being clogged in the middle and a back flow of the leakage of the cooling water from the water reservoir in the direction of the rotation axis.

  Further, the water pump of the present invention becomes one wall when forming the water reservoir, and the first support member that supports the body and the leaked cooling water accumulated in the water reservoir are brought into contact with the body and the first support member. Since it is set as the structure discharged | emitted outside by a surface, a 1st support member becomes a lid | cover of a water reservoir part and the cooling water leaked from the contact surface between a body and a 1st support member can be discharged | emitted outside. In this case, since one side surface constituting the water reservoir that performs the drain function is closed by the first support member by the side surface (end surface) of the first support member, foreign substances can enter the water reservoir as in the conventional case. Can be prevented more easily and effectively, partly clogging in the discharge path of the leaked cooling water, and backflow of the leaked cooling water in the direction of the rotation axis from the water reservoir is prevented. can do.

In this case, the first support member divides the first space by covering the periphery of the impeller, and is configured to discharge the leaked cooling water to the outside along the contact surface . The cooling water leaked by using the contact surfaces of the body and the first support member can be discharged more effectively without using a common member for partitioning the space and a member for supporting the body and increasing the number of parts. .

It is a front view of the water pump which concerns on 1st Embodiment of this invention. It is II-II sectional drawing shown in FIG. It is a front view of the water pump which concerns on 2nd Embodiment of this invention. It is IV-IV sectional drawing shown in 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, but is referred to as cooling water here) to the internal combustion engine (engine) inside the engine so that a hot engine (for example, a cylinder head) is circulated. Used for cooling. 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 (first support member) 3 with a gasket 2. The body 4 has a cylindrical hollow boss portion 24 in the center, and the timing chain side (right side shown in FIG. 2) continuous from the boss portion has a large diameter, and a concave shape is formed on the inside of the large diameter. One 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 through the bearing 8 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 impeller 11 is rotationally driven in the pump chamber 5 by the rotation of the pulley 10 and the cooling water can be circulated inside the engine.

  The body 4 drains the coolant that has leaked from the pump chamber 5 to the second space 26 through the seal member 9 that has a sealing function, from the central position of the second space 26 of the rotary shaft 7 to just below it. A hole 12 is formed. The body 4 has a steam vent 13 in the boss portion 24 through which the cooling water leaked in the second space when the pump is driven (when the impeller 11 is rotated) can be discharged into the atmosphere. It is formed through the body 4 at a position directly above the formed drain hole 12.

  In the drain hole 12, the pipe line extends downward in the vertical direction, and a water reservoir 21 that is a space that is widened in communication with the drain hole 12 below the drain hole 12 is formed in the body 4. The formed water reservoir 21 is a space for accumulating cooling water leaked through the drain hole 12, and is formed with a recess formed below the first space 25 of the body 4 as a wall surface. One opening is formed, the opening is formed in the gasket 2 and the opening diameter of the water reservoir 21 is closed to about ½, and the drain hole 22 formed in the timing chain cover 3 (one is the gasket 2). 2) and a cylinder block 15 having an L-shape in FIG. 2, and a cylinder block 15 having an L shape in FIG. The internal space of the water reservoir 21 is composed of 4 members. It is defined. Further, as shown in FIG. 2, the timing chain cover 3 is configured such that a rotatable impeller 11 is accommodated at a predetermined interval. The timing chain cover 3 has a recess that partitions the first space 25 together with the body 4, and a cooling water inlet 14 that is opened in the axial direction is formed at the center of the impeller 11. Cooling water is taken into the first space 25 from the cooling water inlet 14. In the timing chain cover 3, the bottom surface 21 a that defines the water reservoir 21 coincides with the bottom surface of the opening hole formed in the gasket 2 and the lower position of the large diameter formed in the timing chain cover 3. The hole diameter is reduced from the large diameter portion 28 to the small diameter portion 29 at an intermediate position in the plate thickness direction in the chain cover 3. One of the drain holes 22 is opened, and the end face (side face) of the cylinder block 15 is in contact with the face and closed. For this reason, the timing chain cover 3 and the cylinder block 15 are arranged to face each other, and a contact surface 23 in which planes formed below the timing chain cover 3 and the cylinder block 15 overlap each other is configured. The timing chain cover 3 and the cylinder block 15 are attached to a part of the engine main body, which is the fixing member, or indirectly to the engine main body. Since the contact surface 23 formed between the timing chain cover 3 and the cylinder block 15 does not have a sealing member typified by a gasket in the first embodiment, it accumulates in the water reservoir 21. The leaked cooling water is first stored up to the height position of the large diameter portion 28. Thereafter, the cooling water having an amount larger than that flows to the small-diameter portion 29, and leaks through the contact surface 23 formed in the vertical direction from the small-diameter portion 29 of the drain hole 22 (for example, Although it is not limited, it is possible to efficiently discharge the cooling water that oozes out to the outside 16 with a simple configuration.

  The operation of the present invention will be described below.

  When a timing belt (not shown) is driven by a rotational movement of a crankshaft (not shown) and the pulley 10 to which the timing belt is applied is driven to rotate, the rotary shaft 7 and the rotary shaft 7 rotate integrally with the pulley 10. The impeller 11 provided on one of the two rotates together. In this case, the cooling water existing in the pump chamber 5 of the first space 25 is circulated by the rotation of the impeller 11 from the cooling water inlet 14 via the pump chamber 5 and is pumped to a cooling water outlet (not shown). In such a process, although leakage of cooling water is sealed by the seal member 9 from the seal member 9 for sealing the rotary shaft 7 to the second space 26 on the side opposite to the first space 25, It can occur in no small amount. When such a case occurs, the cooling water leaked from the pump chamber side to the second space 26 flows into the lower water reservoir 21 through the drain hole 12 by its own weight, and enters the water reservoir 21 in the widened space. Accumulate. 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 leaked cooling water that has accumulated through the drain hole 12 gradually accumulates from the bottom to the top of the water reservoir 21, and reaches the lowest height of the small-diameter portion 29 of the drain hole 22. This time, it is configured to flow downward along the contact surface 23 of the timing chain cover 3 and the cylinder block 15 and to be discharged to the outside 16. At this time, the contact surface 23 may be provided with a clearance of about several millimeters at the outside 16 so as to discharge the cooling water that oozes out, and the opening of the drain hole 22 is blocked by the side surface of the cylinder block 15. In addition, foreign matter from the outside does not enter the inside where the water reservoir 21 is formed.

  The effect in 1st Embodiment of this invention is demonstrated. In the first embodiment, the water pump 1 is supported by the timing chain cover 3 and the cylinder block 15, and the water pump 1 is cooled by being collected through the drain hole 12 in the water reservoir portion 21 below the rotation shaft when they contact each other. Water can be efficiently discharged along the contact surface 23 between the timing chain cover 3 and the cylinder block 15.

  In this case, the cylinder block 15 serves as a lid for closing one side of the drain hole 22 formed below the pump chamber 3, and foreign matter enters the water reservoir 21, and the foreign matter is clogged or leaked in the middle of the discharge path. The reverse flow of the discharge path due to the influence of the foreign matter clogged with the cooled water can be suppressed.

Further, since the timing chain cover 3 and the cylinder block 15 are fixed in contact with each other, the coolant that has accumulated in the water reservoir 21 and leaked through the contact surface 23 is effectively discharged to the outside 16 with a simple configuration. can do.

(Second Embodiment)
Next, a second embodiment will be described with reference to FIG. 3 and FIG.

  Since the configuration itself of the water pump 1a shown in the second embodiment is the same as that of the first embodiment, a detailed description is omitted here, but the point different from the first embodiment is that the timing chain cover 3a of the water pump 1a. 1 does not include the drain hole 22 having the large-diameter portion 28 and the small-diameter portion 29 as shown in FIG. 1, and communicates the water reservoir portion 21 formed under the body 4a and having a concave shape with the outside 16. The difference is that the contact surface 23a is provided between the timing chain cover 3a and the body 4a. In this case, a contact surface 23a between the flange portion formed below the water reservoir portion 21 of the body 4a and the timing chain cover 3a is a flat surface, and the water reservoir portion 21 of the second embodiment is interposed via the contact surface 23a. The leaked cooling water is discharged to the outside 16.

  The effect of the second embodiment will be described. In the water pump 1a, the timing chain cover 3a and the body 4a contact each other, and the side surface of the timing chain cover 3a directly functions as a lid that closes the opening of the water reservoir 21. According to the above configuration, the leaked cooling water accumulated in the water reservoir 21 is efficiently discharged to the outside 16 through the contact surface 23a between the body 4a and the timing chain cover 3a, and foreign matter enters the water reservoir 21. This can be suppressed with a simple configuration without increasing the number of parts.

  Further, since the timing chain cover 3a and the body 4a are fixed in contact with each other, the cooling water accumulated in the water reservoir 21 passes through the contact surface 23a in which the timing chain cover 3a and the body 4a are in contact with each other along the discharge path. It can be discharged to the outside 16 with a simple structure without being caused to flow backward by a foreign substance clogged with a part of the outer wall.

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

  In the description of the embodiment, the configuration in which the contact surface 23 is formed between the timing chain cover 3 and the cylinder block 15 has been described. However, the present invention is not limited to this. The bodies 4 and 4a may be supported by a rib provided on a portion (head cover, cylinder head, cylinder block, oil pan, oil pan).

  The drain hole 12 may communicate with the water reservoirs 21 and 21a in the timing chain covers 3 and 3a.

1 Water pump 3, 3a Timing chain cover (first support member)
4, 4a Body 7 Rotating shaft 8 Bearing 9 Seal member 11 Impeller 12 Drain hole 15 Cylinder block (second support member)
16 External 21, 21 a Water reservoir 22 Drain hole 23, 23 a Abutting surface 24 Boss 25 First space 26 Second space

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 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 rotary shaft on the opposite side of the first space via the seal member;
A first support member that communicates with the water reservoir and has a drain hole that is open on one side surface and supports the body;
A second support member disposed to contact the one side surface of the first support member and to face the drain hole ;
A water pump configured to discharge the leaked coolant stored in the water reservoir to the outside through a contact surface between the first support member and the second support member. 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 rotary shaft on the opposite side of the first space via the seal member;
A first support member that becomes one wall when forming the water reservoir and supports the body;
A water pump configured to discharge the leaked cooling water accumulated in the water reservoir to the outside through the body, the first support member, and a contact surface. The said 1st supporting member partitions the said 1st space by covering the circumference | surroundings of the said impeller, It is made to discharge | emit the leaked cooling water to the exterior along the said contact surface below. Or the water pump of Claim 2.

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