JP6064858B2 - Internal combustion engine - Google Patents

Description

  The present invention relates to an internal combustion engine, and more particularly to an internal combustion engine including a water jacket spacer disposed on a water jacket.

  2. Description of the Related Art Conventionally, there is known an internal combustion engine in which a heat transfer adjusting device (water jacket spacer) is disposed in a water jacket formed on the outer periphery of a cylinder bore of a cylinder block (see, for example, Patent Document 1).

  The water jacket spacer disclosed in Patent Document 1 includes upper and lower partition members that separate the inside of the water jacket in the depth direction (upper side and lower side). By providing a difference in the flow rate of the cooling water flowing between the upper side and the lower side by the upper and lower partition members, the temperature difference in the vertical direction (the axial direction of the cylinder bore) in the cylinder bore is reduced.

  Further, the cylinder bore side portion of the upper and lower partition members and the portion opposite to the cylinder bore (on the opposite cylinder bore side) are in contact with the inner wall of the water jacket. Thereby, the sealing performance between the upper flow path and the lower flow path of the upper and lower partition members is ensured. Further, the cylinder bore side portion and the non-cylinder bore side portion of the upper and lower partition members are arranged at the same height in the depth direction.

JP 2008-128133 A

  However, in Patent Document 1, the cylinder bore side portion and the anti-cylinder bore side portion of the upper and lower partition members of the water jacket spacer are arranged at the same height. There is a problem that the insertion load when the jacket spacer is inserted into the water jacket is increased.

  Further, since the cooling water always flows in the water jacket when the engine is driven, there is a problem that the heat retaining property of the wall (bore wall) of the cylinder bore is low when the engine is cold or warmed up.

  The present invention has been made in view of the above problems, and can reduce the insertion load when inserting the water jacket spacer into the water jacket, and can ensure the heat retaining property of the wall portion of the cylinder bore. The object is to provide an internal combustion engine.

  As means for solving the above-described problems, an internal combustion engine according to the present invention is configured as follows.

  That is, the internal combustion engine according to the present invention includes a cylinder block in which a water jacket is formed along the outer periphery of the cylinder bore, and the water jacket is divided into a flow path on the cylinder bore side and a flow path on the opposite side of the cylinder bore. It is premised on a configuration including a water jacket spacer disposed on the water jacket.

In the internal combustion engine according to the present invention, a cylinder bore side seal is provided on the cylinder bore side of the water jacket spacer, and an anti-cylinder bore side seal is provided on the side opposite to the cylinder bore of the water jacket spacer, The anti-cylinder bore side seal is disposed so that a height position thereof changes along a row direction of the cylinder bores, and the cylinder bore side seal is disposed at a position higher than the anti-cylinder bore side seal, and the water jacket A first supply passage for supplying cooling water is connected to the flow path on the cylinder bore side, and a cooling passage is provided on the flow path on the side opposite to the cylinder bore of the water jacket and on the anti-cylinder bore side seal. The water jacket is connected to a second supply path for supplying water, The first supply passage connected to the cylinder bore side of the channel, is characterized in that the valve for supplying or blocking the cooling water is provided.

  According to the internal combustion engine having such a configuration, by arranging the cylinder bore side seal at a position higher than the anti-cylinder bore side seal, compared to the case where the cylinder bore side seal is arranged at substantially the same height position as the anti-cylinder bore side seal, The insertion load when the water jacket spacer is inserted into the water jacket (when assembled) can be reduced. Furthermore, the supply of cooling water to the flow path on the cylinder bore side of the water jacket is optionally supplied by providing a valve for supplying or blocking the cooling water to the first supply path connected to the flow path on the cylinder bore side of the water jacket. Or since it can interrupt | block, the heat retaining property of the wall part of a cylinder bore can be ensured. As a result, the insertion load when the water jacket spacer is inserted into the water jacket can be reduced, and the heat retaining property of the wall portion of the cylinder bore can be ensured when the engine is cold or warmed up.

  As described above, according to the internal combustion engine of the present invention, it is possible to reduce the insertion load when inserting the water jacket spacer into the water jacket and to ensure the heat retaining property of the wall portion (bore wall) of the cylinder bore. it can.

It is the figure which looked at the cylinder block of the internal combustion engine by one Embodiment of this invention from upper direction. It is a disassembled perspective view which shows a cylinder block and a spacer. It is a perspective view which shows a spacer. It is a perspective view which shows the supply path of a spacer and a cooling water. It is sectional drawing along the 200-200 line | wire of FIG. It is the figure which looked at the spacer from the upper part. It is the figure which looked at the spacer from the intake side (IN side). It is the figure which looked at the spacer from the exhaust side (EX side).

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

  The internal combustion engine 100 according to the present embodiment includes a cylinder block 1 as shown in FIGS. 1 and 2. In the cylinder block 1, a cylindrical first cylinder bore # 1, second cylinder bore # 2, third cylinder bore # 3, and fourth cylinder bore # 4 are arranged on a straight line.

  A groove-shaped water jacket 2 through which cooling water flows is formed in the cylinder block 1. The water jacket 2 is formed with substantially the same width so as to surround the outer circumferences of the first cylinder bore # 1 to the fourth cylinder bore # 4. Further, a water jacket is not formed on the portion of the cylinder block 1 opposite to the second cylinder bore # 2 of the first cylinder bore # 1.

  A spacer 3 (water jacket spacer) is disposed in the water jacket 2 of the cylinder block 1. The spacer 3 is mainly formed of a resin, but is formed of a relatively rigid resin capable of maintaining the shape even when the water jacket 2 is in a high temperature state during operation of the internal combustion engine 100. Yes.

  As shown in FIGS. 3, 4 and 6, the spacer 3 is formed along the outer periphery of the first cylinder bore # 1 to the fourth cylinder bore # 4. Specifically, the spacer 3 is formed so that a plurality of arc-shaped portions are connected when viewed from above. In addition, the spacer 3 can also be formed in the shape isolate | separated for every cylinder bore.

  As shown in FIGS. 3, 4, and 5, the spacer 3 is configured so that the cooling water flow path on the intake side (IN side) of the water jacket 2 is a flow path on the cylinder bore side and a flow path on the opposite side of the cylinder bore ( A first partition portion 31 partitioned into a non-cylinder bore side flow path), and protrudes from the first partition portion 31 toward the anti-cylinder bore side, and the flow path on the anti-cylinder bore side is an upper side (upper part) and a lower side (lower part). And a second partitioning section 32 partitioned into two. As a result, the IN-side flow path of the water jacket 2 is partitioned (divided) into an upper flow path 21, a lower flow path 22, and a bore-side flow path 23 as shown in FIG. .

  Further, the spacer 3 includes a third partition 33 that partitions the exhaust water (EX side) cooling water flow path of the water jacket 2 into a cylinder bore flow path and an anti-cylinder bore flow path, and a third partition. And a fourth partition portion 34 extending from the portion 33 toward the non-cylinder bore side. Thereby, the flow path on the EX side of the water jacket 2 is divided into a bore-side flow path 24, an anti-bore-side flow path 25, and a merge portion 26 where the bore-side flow path 24 and the anti-bore-side flow path 25 merge. (Divided).

  Further, as shown in FIG. 5, the upper end portion 31 a of the first partition portion 31 of the spacer 3 is positioned higher than the upper end portion 33 a of the third partition portion 33 (on the cylinder head side disposed above the cylinder block 1). Is formed. In other words, the upper end portion 31 a of the first partition portion 31 of the spacer 3 is formed to extend upward from the upper end portion 33 a of the third partition portion 33.

  As shown in FIGS. 3 and 4, the second partition portion 32 is formed on the outer peripheral surface 31 b of the first partition portion 31. Specifically, the portion corresponding to the first cylinder bore # 1 in the second partition 32 is formed in a substantially L shape as shown in FIG. Further, a portion of the second partition 32 corresponding to the second cylinder bore # 2 to the fourth cylinder bore # 4 is formed so as to extend obliquely upward along the second cylinder bore # 2 to the fourth cylinder bore # 4. ing.

  As shown in FIG. 8, the fourth partition portion 34 is formed on the outer peripheral surface 33 b of the third partition portion 33. Specifically, the portion corresponding to the first cylinder bore # 1 in the fourth partition portion 34 has a portion extending in the vertical direction (cylinder bore axial direction) and a portion extending in the column direction of the cylinder bores. Moreover, the part corresponding to 2nd cylinder bore # 2-4th cylinder bore # 4 among the 4th division parts 34 is extended linearly along the row direction of a cylinder bore.

  Here, in this embodiment, as shown in FIGS. 3, 4, and 5, the rubber seal 4 is provided on the inner peripheral surface 31 c in the vicinity of the upper end portion 31 a of the first partition portion 31. A rubber seal 5 is provided on the outer peripheral surface 32 a of the second partition part 32. The rubber seal 4 is an example of the “cylinder bore side seal” in the present invention, and the rubber seal 5 is an example of the “anti-cylinder bore side seal” in the present invention. The cross sections of the rubber seals 4 and 5 have a rectangular shape as shown in FIG. The cross sections of the rubber seals 4 and 5 may be circular or elliptical in addition to the rectangular shape.

  As shown in FIG. 5, the rubber seal 4 provided on the inner peripheral surface 31 c in the vicinity of the upper end portion 31 a of the first partition portion 31 is in close contact with the inner wall 2 a on the cylinder bore side of the water jacket 2 (wall portion 1 a of the cylinder bore). Yes. The rubber seal 5 provided on the outer peripheral surface 32 a of the second partition 32 is in close contact with the inner wall 2 b of the water jacket 2 on the side opposite to the cylinder bore. Thereby, the flow path on the side opposite to the cylinder bore in the water jacket 2 is partitioned (divided) into the upper flow path 21 and the lower flow path 22, and the seal between the upper flow path 21 and the lower flow path 22. Sex is secured. Further, since the space between the bore-side flow path 23 formed between the first partition portion 31 and the inner wall 2a and the lower-side flow path 22 is not sealed, the cooling water is exchanged with the bore-side flow path 23. It is possible to circulate between the lower channel 22.

  The rubber seal 4 provided on the inner peripheral surface 31c near the upper end 31a of the first partition 31 and the rubber seal 5 provided on the outer peripheral surface 32a of the second partition 32 are in the vertical direction (height direction). It is arranged at a position shifted to. That is, in this embodiment, the rubber seal 4 provided on the inner peripheral surface 31 c in the vicinity of the upper end portion 31 a of the first partition portion 31 is higher than the rubber seal 5 provided on the outer peripheral surface 32 a of the second partition portion 32 ( It is arranged on the cylinder head side (above the cylinder block 1).

  As described above, the insertion load when the spacer 3 is inserted into the water jacket 2 is reduced by shifting the height positions of the rubber seal 4 and the rubber seal 5. Further, the height of the rubber seal 5 can be arbitrarily changed in order to secure the water flow cross-sectional area of the upper flow path 21. Then, by changing the height position of the rubber seal 5 and changing the hole diameter of a cylinder head gasket (not shown) disposed between the cylinder block 1 and the cylinder head, the flow rate balance and passage of the cylinder head are changed. The water resistance can be adjusted. In addition, when changing the height position of the rubber seal 5, the height position of the 2nd division part 32 will also be changed.

  As shown in FIG. 4, a first supply path 6 that supplies cooling water to the lower flow path 22 is connected to the lower flow path 22 of the water jacket 2. In the middle of the first supply path 6, a valve 7 that supplies or blocks the cooling water to the lower flow path 22 is provided. The valve 7 is constituted by a block thermo, a solenoid valve, or the like. A second supply path 8 that supplies cooling water to the upper flow path 21 is connected to the upper flow path 21 of the water jacket 2. Cooling water is always supplied to the upper flow path 21 through the second supply path 8.

  The cooling water supplied to the lower flow path 22 by the first supply path 6 flows from the first cylinder bore # 1 toward the fourth cylinder bore # 4 on the IN side. Further, as shown in FIG. 5, since the lower flow path 22 and the bore flow path 23 are not sealed in the lower part, the cooling water flows to the bore flow path 23 through the lower flow path 22. It has become. Thereby, for example, when the supply of cooling water is interrupted (stopped) by the valve 7 when the engine is cold or warmed up, the flow of the cooling water in the lower channel 22 and the bore channel 23 is stopped. Therefore, the heat retention at the lower part of the cylinder bore is promoted.

  Further, the cooling water supplied to the lower flow path 22 by the first supply path 6 passes through the EX side bore 22 from the IN side lower flow path 22 and the bore side flow path 23, as shown in FIGS. While flowing to the side flow path 24, the anti-bore side flow path 25, and the merging portion 26, the flow flows from the fourth cylinder bore # 4 toward the first cylinder bore # 1. Then, the cooling water rises from the merging portion 26 in the vicinity of the first cylinder bore # 1 to a cooling water flow path (not shown) on the cylinder head side.

  The cooling water supplied to the upper flow path 21 by the second supply path 8 flows from the first cylinder bore # 1 toward the fourth cylinder bore # 4. Thereafter, the cooling water flows from the upper flow path 21 to the EX-side bore-side flow path 24, the anti-bore-side flow path 25, and the merging portion 26, and flows out from the lower-side flow path 22 and the bore-side flow path 23. To join. The joined cooling water flows from the fourth cylinder bore # 4 toward the first cylinder bore # 1. Then, the cooling water rises from the merging portion 26 in the vicinity of the first cylinder bore # 1 to a cooling water flow path (not shown) on the cylinder head side.

  As described above, according to the internal combustion engine 100 according to the present embodiment, the effects listed below can be obtained.

  In the present embodiment, as described above, by disposing the rubber seal 4 provided on the cylinder bore side of the first partition portion 31 at a position higher than the rubber seal 5 provided on the side opposite to the cylinder bore of the first partition portion 31, Compared with the case where the rubber seal 4 is arranged at substantially the same height as the rubber seal 5, the insertion load when the spacer 3 is inserted into the water jacket 2 (when assembled) can be reduced.

  Furthermore, by providing a valve 7 for supplying or blocking cooling water to the first supply path 6 connected to the bore-side flow path 23 on the cylinder bore side via the lower flow path 22 on the side opposite to the cylinder bore of the water jacket 2, Since the supply of cooling water to the bore-side flow path 23 on the cylinder bore side can be arbitrarily supplied or cut off, the heat retaining property of the wall 1a of the cylinder bore can be ensured.

  As a result, the insertion load when the spacer 3 is inserted into the water jacket 2 can be reduced, and the heat retaining property of the wall 1a of the cylinder bore can be ensured when the engine is cold or warmed up.

-Other embodiments-
The embodiment disclosed this time should be considered as illustrative in all points and not restrictive. The scope of the present invention is shown not by the above description of the embodiments but by the scope of claims for patent, and further includes all modifications within the meaning and scope equivalent to the scope of claims for patent.

  For example, in the said embodiment, although the example which provides a valve which consists of a block thermo, an electromagnetic valve, etc. in the 1st supply path was shown, this invention is not limited to this. In the present invention, a valve other than a block thermo or a solenoid valve can be applied as long as it can supply or shut off the cooling water supplied to the IN-side lower flow path and the bore-side flow path.

  In the above embodiment, an example in which a water jacket is not provided in a portion of the cylinder block opposite to the second cylinder bore of the first cylinder bore is shown, but the first cylinder bore of the cylinder block is opposite to the second cylinder bore. You may provide a water jacket in the part.

  The present invention can be used for an internal combustion engine. More specifically, the present invention can be used for an internal combustion engine including a water jacket spacer disposed on a water jacket.

1 Cylinder block 2 Water jacket 3 Spacer (water jacket spacer)
4 Rubber seal (cylinder bore side seal)
5 Rubber seal (anti-cylinder bore side seal)
6 First supply path 7 Valve 8 Second supply path 21 Upper flow path 22 Lower flow path 23 Bore side flow path 24 Bore side flow path 25 Anti-bore side flow path 26 Junction section 100 Internal combustion engine # 1 First cylinder bore # 2 2nd cylinder bore # 3 3rd cylinder bore # 4 4th cylinder bore

Claims (1)

A cylinder block having a water jacket formed along the outer periphery of the cylinder bore;
In an internal combustion engine comprising: a water jacket spacer disposed in the water jacket so as to partition the water jacket into a flow path on the cylinder bore side and a flow path on the opposite side of the cylinder bore;
A cylinder bore side seal is provided on the cylinder bore side of the water jacket spacer, and an anti-cylinder bore side seal is provided on the side opposite to the cylinder bore of the water jacket spacer,
The anti-cylinder bore side seal is arranged such that the height position changes along the row direction of the cylinder bores, and the cylinder bore side seal is arranged at a position higher than the anti-cylinder bore side seal,
The flow path on the cylinder bore side of the water jacket is connected to a first supply path for supplying cooling water, and is connected to the flow path opposite to the cylinder bore of the water jacket and above the anti-cylinder bore side seal. Is connected to the second supply path for supplying cooling water,
An internal combustion engine characterized in that a valve for supplying or blocking cooling water is provided in a first supply path connected to a flow path on the cylinder bore side of the water jacket.

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