JP2016070094A - Internal combustion engine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To suppress cooling water which leaks out of a water pump from becoming conspicuous as much as possible.SOLUTION: A leak water sump 41 for storing cooling water passing through seal means 34 is formed at a lower end of a pump housing 23. An outwardly-opened opening part of the leak water sump 41 is closed by a lid 44, and an exhaust port 45 which is opened toward a front cover 4 is formed at a bottom. A notched groove 46 communicating with the exhaust port 45 is formed at the front cover 4, and a recess 47 in which the exhaust port 45 is opened is formed at a base end face 23a of the pump housing 23. Since the exhaust port 45 is inconspicuous, the dripping cooling water also becomes inconspicuous, and it can be prevented that the water pump 10 is misunderstood to be failed or damaged.SELECTED DRAWING: Figure 3

Description

  The present invention relates to an internal combustion engine provided with a water pump, and is particularly suitable for an internal combustion engine for a vehicle.

  An internal combustion engine for a vehicle is generally water-cooled, and therefore includes a water pump driven by a crankshaft. The water pump includes a rotating shaft having an impeller fixed to one end, and the rotating shaft is rotatably held in a pump housing by a bearing. The pump housing is provided with a sealing means for preventing the cooling water from flowing to the bear link side. However, the sealing function of the seal blocking is not perfect, and a slight water leakage is likely to occur.

  Therefore, the pump housing is provided with a hollow water leakage reservoir where the leaked water flows down and accumulates so that the cooling water that has passed through the sealing means does not reach the bearing, and the water leakage reservoir overflows. A discharge port (drain passage) for discharging cooling water or discharging steam is provided.

  As an example, Patent Document 1 discloses that a lid is provided with a discharge port in a configuration in which a leak reservoir is opened to the opposite side of the engine body and the opening is closed with a lid. On the other hand, in Patent Document 2, a second water reservoir portion communicating with the first water reservoir portion formed in the pump housing 23 is also formed on the outer surface of the engine block, and the outer surface of the engine block is positioned outside the pump housing 23. Forming a drain port (discharge port).

JP 2008-112488 A JP 2002-285598 A

  In both these patent documents, there is no particular inconvenience in terms of cooling water and steam discharge. However, when the bonnet is opened in a state where it is mounted in the engine room of the vehicle, both of them see the cooling water dripping from the discharge port. It was easy to touch, and therefore, there was a problem that it was easy to give a misunderstanding as if the water pump was broken or parts were damaged, causing water leakage.

  Further, in an internal combustion engine for a vehicle, it is widely performed to add an antifreeze called LLC (long life coolant) to cooling water. However, when cooling water to which LLC is added hangs down on the outer surface of the engine body, Since the LLC components are crystallized and precipitated, in Patent Document 2, not only does the crystal lines of the LLC look like dirt and looks bad, but when the water pump is replaced, the crystals are separated from the pump housing and the engine body. There is also a possibility that the sealing property is deteriorated by biting between the two.

  The present invention has been made to improve the current situation.

The water pump of the present invention is
A rotary shaft provided with an impeller at one end is rotatably disposed inside the pump housing fixed to the engine body via a bearing, and between the impeller and the bearing in the pump housing. Sealing means for preventing cooling water from flowing to the bearing side is provided at the site, and the pump housing is further provided with a water leakage reservoir for collecting cooling water leaked from the sealing means. Because
A discharge port for discharging cooling water or steam overflowing from the water leakage reservoir to the outside is formed to open toward the engine body.

  In claim 1, in order to discharge the cooling water or steam reaching the discharge port to the outside, for example, a notch groove communicating with the discharge port may be formed in the engine body or the pump housing or both.

  The engine body can be developed in various ways. As an example, in claim 2, in claim 1, the discharge port of the water leakage reservoir portion opens in a recess provided in a surface of the pump housing that faces the engine body.

  The invention of claim 3 provides the discharge port of the water leakage reservoir portion in the portion between the bolt fastening portions adjacent to the left and right as viewed from the axial direction of the rotating shaft. Yes.

  In the present invention, since the discharge port is opened toward the engine body, even if the cooling water drips from the discharge port, the sag state is difficult for the pump housing to get in the way of human eyes. For this reason, it can prevent or suppress greatly that it is misunderstood that the water pump is out of order or damaged. Even if the cooling water drips down along the outer surface of the engine body, the drooping path is still difficult to see because the pump housing gets in the way, so even if LLC components deposit on the sag, it is difficult to see this. Thus, deterioration in appearance can be prevented or significantly suppressed.

  In addition, the pump housing is usually fixed to the front cover or the cylinder block, but these may be at a temperature higher than that of the water pump pump housing due to heat transfer from the combustion chamber. Because it is normal, it is possible to suppress the dripping by promoting the evaporation of the discharged cooling water, and even if dripping on the outer surface of the engine body, it quickly evaporates with the heat of the engine body, Deterioration of appearance can be suppressed by shortening the length.

  As described above, LLC crystals are likely to precipitate after the cooling water to which LLC is added adheres. However, if a recess is provided as in claim 2, the cooling water travels through the inner surface of the recess and then goes to the outside. Since it drips or evaporates, crystals can be stored in the recess. Thereby, the deterioration of the appearance by touching a crystal | crystallization to a human eye can be suppressed more exactly.

  Furthermore, since the LLC crystal is hidden in the recess, the LLC crystal bites into the mating surface between the pump housing and the engine body when the pump housing is removed and reattached for maintenance or replacement of internal parts. This can be prevented or remarkably suppressed to ensure sealing performance.

  Further, when the configuration of claim 3 is adopted, since the pressing force by the bolt acts strongly at the location of the discharge port in the pump housing, the LLC crystal is temporarily formed between the pump housing and the engine body in the vicinity of the discharge port. Even if it is bitten in between, the crystal can be firmly crushed to ensure high sealing performance.

1 is a front view of an internal combustion engine to which an embodiment is applied. It is a schematic plan view. (A) is a sectional view taken along the line II-II in FIG. 1, and (B) is an enlarged view of the essential part of (A). FIG. 4 is a sectional view taken along line IV-IV in FIG. 3.

(1). Outline Next, an embodiment of the present invention will be described with reference to the drawings. First, the outline of the internal combustion engine will be described with reference to FIGS.

  The internal combustion engine includes an engine main body 1. The engine main body 1 includes, as main elements, a cylinder block 2 and a cylinder head 3 fixed to the upper surface thereof, and a front cover (one end surface thereof fixed with a large number of bolts). Chain cover, chain case) 4. A head cover 5 is fixed to the upper surface of the cylinder head 3, and an oil pan 6 is fixed to the lower surface of the cylinder block 2.

  In the internal combustion engine of the present embodiment, the cylinder axis O1 is slightly inclined (slant) with respect to the vertical line O2, but in FIG. 1, the cylinder axis O1 is displayed in a vertical posture for convenience. .

  One end of the crankshaft 7 protrudes outside the front cover 4, while a motor generator (ISG) 8 is disposed on the left side of the engine body 1 in a front view, and an air conditioner compressor 9 is disposed on the right side. ing. In addition, a water pump 10 is disposed in a portion of the front cover 4 that is substantially in the middle of the upper and lower sides and on the left side.

  The motor generator 8, the air conditioner compressor 9, and the water pump 10 are each provided with pulleys 11, 12, and 13 fixed to the rotary shaft, while the protruding end portion of the crankshaft 7 is in the order closer to the front cover 4. A first crank pulley 14, a second crank pulley 15, and a third crank pulley 16 are provided. A first belt 17 is wound around the pulley 11 and the first crank pulley 14 of the motor generator 8, and the compressor 9 for an air conditioner is provided. The second belt 18 is wound around the pulley 12 and the second crank pulley 15, and the third belt 19 is wound around the pulley 13 and the third crank pulley 16 of the water pump 10.

  Reference numeral 20 denotes an auto tensioner, reference numeral 21 denotes an idle pulley of the first belt 17, and the water pump 10 is disposed below the idle pulley 21. An alternator may be arranged instead of the motor generator 8, and in this case, the auto tensioner 20 is unnecessary. Each auxiliary machine may be driven by one or two belts.

(2). Structure of Water Pump Next, the water pump 10 will be described with reference to FIGS. The water pump 10 has a pump housing (body) 23 with bolts on the outer surface of the front cover 4, and a rotary shaft 25 that is rotatably held through a bearing 24 therein. The portion is fitted into the front cover 4 and the impeller 26 is fixed to the front cover 4, while the pulley 13 described above is fixed to the other end of the rotating shaft 25 exposed to the outside of the pump housing. . The pulley 13 has a substantially bowl-like shape and is disposed in a state of surrounding the front end portion of the pump housing 23.

  The impeller 26 is disposed in a pump chamber 28 formed by the front cover 4 and the cylinder block 2. Therefore, a part of the front cover 4 and the cylinder block is also used as an element of the water pump 10. A cooling water inlet 29 and a cooling water outlet (not shown) communicate with the pump chamber 28. The cooling water inlet 29 opens toward the axial center of the rotating shaft 25, and the cooling water outlet is located on the far side of the paper surface of FIG.

  The pump housing 23 basically has a cylindrical shape that is loosely narrowed away from the front cover 4. A flange 30 is provided at the base end of the pump housing 23, and the flange 30 is fronted by four bolts (not shown). It is fixed to the cover 4.

  The flange 30 has an approximately inverted trapezoidal shape when viewed from the axial direction of the rotary shaft 25, and each corner portion is a bolt fastening portion. Therefore, although the bolt hole 31 is vacant in each corner part of the flange 30, the flange 30 has an inverted trapezoidal shape and is slightly long in the vertical direction as described above. The distance between the two bolt holes 31 is smaller than the distance between the other adjacent bolt holes 31.

  Inside the pump housing 23, a hollow chamber 32 communicating with the pump chamber 28 and a smaller diameter than that of the shaft support chamber 33 having a smaller diameter than the cavity chamber 32 are formed, and the shaft support chamber 33 is close to the pump chamber 28. As an example of the sealing means, a sealing device 34 such as a mechanical seal is fitted at the end. Further, the outer race 35 is fitted to a portion of the shaft support chamber 33 on the tip side of the seal device 34, and the rotary shaft 25 is rotatably held by the front and rear bearings 24 held by the outer race 35.

  A seal ring 36 that is slidably in contact with the rotary shaft 25 is attached to a proximal end portion of the outer race 35 close to the seal device 34. A buffer gap 37 with a slight gap is provided between the seal ring 36 and the seal device 34, and cooling water leaked from the seal device 34 to the buffer gap 37 in a portion of the pump housing 23 where the buffer gap 37 is located. Are formed in a substantially vertical posture, a water leakage flow passage 38 that causes the water vapor to flow downward, and a steam vent passage 38 that allows water vapor to escape upward.

  A lower rib 40 extending long in the axial direction of the rotary shaft 25 is provided on the lower surface of the pump housing 23 so as to project downward. The lower rib 40 communicates with the water leakage flow passage 38 and is connected to the axis of the rotary shaft 25. On the other hand, an upper rib 42 extending long in the axial direction of the rotary shaft 25 is provided on the upper surface of the pump housing 23 so as to protrude upward. A steam diffusion passage 43 that communicates with the steam release passage 39 and extends long in the axial direction of the rotary shaft 25 is formed.

  Both the water leak reservoir 41 and the vapor diffusion passage 43 are open to the tip side (the pulley 13 side) of the pump housing 23. The vapor diffusion passage 43 is simply left open, but the opening of the water leakage reservoir 41 is closed with a lid 44, and a discharge port 45 opened toward the front cover 4 at the upper end of the bottom opposite to the lid 44. Is open.

  A cutout groove 46 extending downward from the pump housing 23 is formed on the outer surface 4a of the front cover 4 so as to face the discharge port 45. Further, an end face of the pump housing 23 faces the cutout groove 46. A recess 47 is formed, and a discharge port 45 is opened above the recess 47. Therefore, the cooling water overflowing from the water leakage reservoir 41 and the steam accumulated in the water leakage reservoir 41 are discharged to the outside of the internal combustion engine through the discharge port 45, the recess 47 and the notch groove 46.

  As shown by a one-dot chain line in FIG. 3B, a notch groove 46 ′ communicating with the recess 47 and opening downward is formed in the base end surface 23 a of the pump housing 23 below the recess 47. Thus, the cooling water or steam may escape from the notch groove 46 ′ of the pump housing 23. In this case, the cooling water does not hang down the outer surface of the front cover 4.

  The water leakage lower passage 38 and the steam vent passage 39 extend in a straight line, and both are formed by passing a drill from the lower rib 40. Therefore, the drill hole formed in the lower portion of the lower rib 40 is closed with the plug 48. As shown in FIG. 4, the water leakage flow passage 38 and the steam vent passage 39 extend in a substantially vertical posture. Accordingly, cooling water flow and steam rise are most efficiently performed. In addition, although the axial center of the water leakage flow passage 38 and the steam vent passage 39 is slightly shifted from the axial center of the rotating shaft 25, it may be aligned with the axial center of the rotating shaft 25.

(3) Summary / Others As described above, when the water leakage reservoir 41 is almost full and the cooling water overflows, the cooling water is discharged from the discharge port 45, but the discharge port 45 is behind the pump housing 23. Since it is difficult to touch the human eye, it is possible to greatly prevent the dripping cooling water from touching the human eye and misunderstanding that the water pump 10 is broken or damaged.

  Further, since the cooling water exiting the discharge port 45 flows through the recess 47 and then travels down to the recess of the front cover 4, it easily evaporates before it travels down to the outer surface of the front cover 4. That is, it is possible to promote the evaporation of the cooling water completely hidden from human eyes. Also from this aspect, it is possible to accurately suppress the cooling water from dripping while in contact with the human eye.

  Further, the temperature of the front cover 4 is higher than that of the pump housing 23, and the pump housing 23 has a base end portion close to the front cover 4 having a temperature higher than that of the front end portion, so that the cooling water is discharged from the discharge port 45. Cooling water evaporation is also promoted. Also in this aspect, the effect of suppressing the cooling water from touching the human eye is exhibited.

  Further, even when LLC is added to the cooling water, as shown in FIG. 3 (B), the LLC crystal 49 is concentrated on the inner surface of the recess 47. Not only can the deterioration be greatly suppressed, but when the pump housing 23 is removed and then reattached, the crystal 49 can be prevented from being caught between the pump housing 23 and the front cover 4.

  The discharge port 45 is located at the lower end of the pump housing 23 and is located between two bolt holes 31 adjacent to each other on the left and right sides. Since the pressure by the bolt strongly acts on the location of the discharge port 45, the LLC crystal 49 is temporarily bitten between the pump housing 23 and the front cover 4. However, the crystal 49 can be reliably crushed to ensure high sealing performance.

  While the embodiments of the present invention have been described above, the present invention can be embodied in various ways. For example, it is possible to make the recess 47 of the embodiment deeper than the state shown in the figure and to open a drain hole in the lower portion of the recess 47. In the example shown in the figure, the vapor diffusion passage and the water leakage reservoir are arranged almost vertically, but the vapor diffusion passage may be located above the rotation shaft and the water leakage retention portion may be located below the rotation shaft. Therefore, the water leakage flow passage 38 and the steam vent passage 38 may be greatly inclined with respect to the vertical line. Further, the water leakage passage 38 and the steam vent passage 38 may be displaced in the axial direction of the rotary shaft 25.

  The present invention can be embodied in a water pump for an internal combustion engine. Therefore, it can be used industrially.

DESCRIPTION OF SYMBOLS 1 Engine main body 2 Cylinder block which comprises engine main body 4 Front cover which comprises engine main body 7 Crankshaft 23 Pump housing 24 Bearing 25 Rotating shaft 26 Impeller 28 Pump chamber 31 Bolt hole vacated in bolt fastening part 37 Buffer gap 38 Water leakage Downflow passage 39 Vapor vent passage 40 Lower rib 41 Leakage reservoir 44 Lid 45 Outlet 46 Notch groove 47 Recess 49 LLC crystal

Claims (3)

A rotary shaft provided with an impeller at one end is rotatably disposed inside the pump housing fixed to the engine body via a bearing, and between the impeller and the bearing in the pump housing. The part is provided with sealing means for preventing cooling water from flowing to the bearing side,
Further, the pump housing has a structure in which a water leakage reservoir for storing cooling water leaked from the sealing means is formed,
A discharge port for discharging cooling water or steam overflowing from the water leakage reservoir to the outside is formed so as to open toward the engine body.
Internal combustion engine. The discharge port of the water leakage reservoir is open inside a recess provided in a surface of the pump housing that faces the engine body.
The internal combustion engine according to claim 1. The discharge port of the water leakage reservoir is provided at a site between the bolt fastening portions adjacent to the left and right as seen from the axial direction of the rotating shaft.
The internal combustion engine according to claim 1 or 2.

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