JP2009185638A - Internal combustion engine - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an internal combustion engine inhibiting deformation of an inner wall forming a cylinder in an open deck type cylinder block, better than former internal combustion engines. <P>SOLUTION: The internal combustion engine 1A is provided with a cylinder block 2 including: an inner wall 11 forming a plurality of cylinders 10 and including joint parts 11b joining cylinder wall parts 11a of adjacent cylinders 10; and an outer wall 13 provided around the inner wall 11 with putting a water jacket groove 12 therebetween, and also having the inner wall 11 and the outer wall 13 divided by the water jacket groove 12 at a top deck surface 2a. It is also provided with: a top deck spacer 15 provided over a whole outer circumference of the inner wall 11, a through-hole 14 passing through the joint part 11b and opening to an outer circumference surface of the inner wall 11 at both ends thereof; and a bolt 16 passing through the through-hole 14 and connecting a pair of intermediate parts 15c so as to make the pair of intermediate parts 15c facing each other with putting the joint part 11b therebetween in the top deck spacer 15, adhere to the joint part 11b respectively. <P>COPYRIGHT: (C)2009,JPO&INPIT

Description

  The present invention relates to an internal combustion engine including an open deck type cylinder block.

  A cylinder block having an inner wall forming a plurality of cylinders and an outer wall provided with a water jacket groove sandwiched around the inner wall, the inner wall and the outer wall being separated by a water jacket groove on the top deck surface. A so-called open deck type internal combustion engine provided is known. In such an open deck type internal combustion engine, a portion of the cylinder block inner wall connecting the cylinder wall portions of adjacent cylinders and the cylinder block outer wall are fastened by a fastening bolt that crosses the water jacket groove, thereby What suppresses a deformation | transformation of a block outer wall is known (refer patent document 1). In addition, Patent Documents 2 to 5 exist as prior art documents related to the present invention.

JP 2004-324568 A JP 2006-2828 A Japanese Utility Model Publication No. 4-52453 Japanese Patent No. 3355635 JP 2001-317404 A

  In the open deck type cylinder block, the inner wall and the outer wall forming the cylinder are separated by the top deck surface, so that the inner wall is easily deformed outward due to thermal expansion or the like. If the inner wall is deformed to the outside, for example, the diameter of the cylinder may increase, and the gap between the cylinder and the piston may increase. In the internal combustion engine provided with the cylinder block of Patent Document 1, the deformation of the outer wall of the cylinder block is suppressed, and the suppression of the deformation of the inner wall is not taken into consideration.

  Accordingly, an object of the present invention is to provide an internal combustion engine capable of suppressing deformation of an inner wall forming a cylinder by an open deck type cylinder block as compared with the conventional one.

  An internal combustion engine of the present invention forms a plurality of cylinders arranged in one direction, and includes an inner wall having a cylinder wall portion that forms a cylinder and a coupling portion that couples cylinder wall portions of adjacent cylinders, and the inner wall And an outer wall provided with a water jacket groove interposed therebetween, wherein the inner wall and the outer wall are separated by the water jacket groove on a top deck surface facing the cylinder head. A spacer member provided on the outer periphery of the inner wall so as to be in contact with the inner wall, and the coupling portion extending in a direction intersecting with the arrangement direction of the plurality of cylinders, both ends of the outer wall of the inner wall A through hole that opens to the surface and a pair of intermediate portions that face each other across the coupling portion of the spacer member are in close contact with the coupling portion. Wherein a connecting member connecting the pair of intermediate portions through the through hole, by providing as to solve the problems mentioned above (claim 1).

  According to the internal combustion engine of the present invention, since the pair of intermediate portions arranged on both sides of the coupling portion are coupled by the coupling member, even if the spacer member is deformed to the outside due to thermal expansion of the inner wall, the coupling member The deformation can be suppressed. Therefore, the inner wall can be securely tightened and restrained over the entire circumference by the spacer member. Therefore, the deformation of the inner wall can be suppressed as compared with the conventional case. Further, since the connecting member is disposed in the through hole, the connecting member can be provided in the coupling portion without protruding from the top deck surface.

  In one form of the internal combustion engine of the present invention, the connecting member may be formed of a shape memory material that contracts in response to an increase in temperature. In this case, when the temperature rises, the connecting member contracts, so that the clamping force of the spacer member that clamps the inner wall can be increased. Therefore, deformation to the outside of the inner wall due to thermal expansion or the like can be further suppressed. Further, by forming the connecting member with the shape memory material as described above, each intermediate portion can be brought into close contact with the coupling portion by contraction of the connecting member even if the gap between the inner wall and the spacer member is somewhat large. Therefore, the processing accuracy required for processing the inner wall and the spacer member can be lowered. Thereby, the processing cost of these components can be reduced.

  In one form of the internal combustion engine of the present invention, the connecting member is a bolt, and is arranged in one intermediate portion of the pair of intermediate portions in the same direction as the direction in which the through hole extends coaxially with the through hole. A first bolt hole penetrating the one intermediate portion and through which the bolt is inserted is disposed on the other intermediate portion of the pair of intermediate portions and coaxially with the through hole. There is provided a second bolt hole that penetrates the other intermediate portion in the same direction as the through hole extends, and is formed with a female screw portion into which the bolt is screwed, and the one intermediate portion includes the first bolt A first cooling water passage that is open to an upper surface of the spacer member that communicates with the hole and faces the cylinder head, and that penetrates the spacer member in a direction intersecting the first bolt hole from the upper surface; A second cooling water passage that communicates with the second bolt hole and opens at the upper surface of the spacer member and penetrates the spacer member from the upper surface in a direction intersecting the second bolt hole is formed in the intermediate portion of the first side. It may be provided (Claim 3). In this case, the cooling water can be introduced into the through hole from the water jacket groove or the like via each bolt hole and each cooling water passage. In general, the joint provided between the cylinders is less likely to be cooled than the other parts of the cylinder block. In this embodiment, cooling water can be introduced into the coupling portion to cool the coupling portion, so that the cooling efficiency of the cylinder block is improved and the upper limit of the heat load that can be applied to the cylinder block is higher than before. Can be high. Therefore, the performance of the internal combustion engine can be improved.

  In this embodiment, the lower surface of the cylinder head opposed to the upper surface of the spacer member is provided with an opening portion of the first cooling water passage and an opening portion of the second cooling water passage that are open on the upper surface of the spacer member. A plurality of discharge ports through which cooling water is discharged from the cooling water passage of the cylinder head may be provided so as to face each other. In this case, since the cooling water can be supplied to each cooling water passage from the cooling water passage of the cylinder head, the cooling water in the through hole can be forced to flow. Thereby, it is possible to prevent the cooling water from staying in the through hole and further promote the cooling of the coupling portion.

  In one form of the internal combustion engine of the present invention, the connecting member is a bolt, and the pair of intermediate portions are disposed coaxially with the through hole and penetrate the intermediate portion in the same direction as the direction in which the through hole extends. And a bolt hole through which the bolt is passed, and one intermediate portion of the pair of intermediate portions opens to the upper surface of the spacer member facing the cylinder head, from the upper surface to the bolt hole. A cooling water inlet passage formed is provided, and a cooling water outlet passage formed from the bolt hole to the outer surface of the spacer member is provided in the other intermediate portion of the pair of intermediate portions, and an upper surface of the spacer member The cooling water from the cooling water passage of the cylinder head is opposed to the lower surface of the cylinder head that faces the opening of the cooling water inlet passage that opens to the upper surface of the spacer member. Discharge port may be provided to be ejected (claim 5). In this case, the cooling water flows into the cooling water inlet passage from the cooling water passage of the cylinder head, and then passes through the through hole and is guided to the cooling water outlet passage. Therefore, the cooling water can be reliably guided to the through hole. Further, in this embodiment, almost the entire amount of the cooling water flowing from the cooling water passage of the cylinder head into the cooling water inlet passage can be guided to the through hole, so that the flow rate of the cooling water flowing through the through hole is increased and The flow rate of the cooling water can be increased. Therefore, heat transfer from the cylinder block to the cooling water can be promoted, and cooling of the coupling portion can be further promoted.

  In one form of the internal combustion engine of the present invention in which a passage through which cooling water is guided to the intermediate part of the spacer member is provided, each intermediate part of the spacer member has at least an outer peripheral surface of the inner wall among the outer surfaces in contact with the coupling part. A contact portion made of an elastic body may be provided in a portion in contact with the periphery of the opening portion of the through hole that is open (Claim 6). In this case, since it is possible to prevent the cooling water from leaking between the coupling portion and the intermediate portion, it is possible to prevent the flow rate of the cooling water guided to the through hole from being lowered. Therefore, the cooling of the joint can be further promoted. Further, since the contact portion is made of an elastic body, if the shape of the contact portion substantially matches the shape of the coupling portion, the contact portion can be brought into close contact with the coupling portion by deformation of the contact portion. Therefore, the processing accuracy required for processing the contact portion can be lowered. Thereby, the processing cost can be reduced.

  As described above, according to the internal combustion engine of the present invention, the pair of intermediate portions disposed on both sides of the coupling portion are coupled by the coupling member, so that the deformation of the spacer member can be suppressed by the coupling member. . Therefore, the inner wall can be securely tightened and restrained over the entire circumference by the spacer member, so that deformation of the inner wall can be suppressed as compared with the conventional case.

(First form)
1 and 2 show the main part of an internal combustion engine according to the first embodiment of the present invention. 1 shows a cross section of the internal combustion engine taken along line II of FIG. 2, and FIG. 2 shows a cross section of the internal combustion engine taken along line II-II of FIG. An internal combustion engine 1 </ b> A shown in FIGS. 1 and 2 is mounted on a vehicle as a driving power source, and includes a cylinder block 2 and a cylinder head 3. A head gasket 4 is provided between the cylinder block 2 and the cylinder head 3 so that they are in close contact with each other. The cylinder head 3 is fixed to the cylinder block 2 by a plurality of head bolts (not shown). The head gasket 4 and the head bolt (not shown) may be the same as those known for use in an internal combustion engine, and thus detailed description thereof is omitted.

  As shown in FIG. 2, the cylinder block 2 has an inner wall 11 that forms a plurality of cylinders 10 arranged in one direction, and an outer wall provided with a water jacket groove 12 through which cooling water flows around the inner wall 11. 13. The inner wall 11 includes a cylinder wall portion 11a that forms the cylinder 10, and a coupling portion 11b that couples the cylinder wall portions 11a of the adjacent cylinders 10 and integrates the cylinder wall portions 11a. As shown in FIG. 2, the cylinder block 2 is a so-called open deck type cylinder block in which an inner wall 11 and an outer wall 13 are separated by a water jacket groove 12 on a top deck surface 2 a facing the cylinder head 3. . As shown in FIG. 1 and FIG. 2, each coupling portion 11 b of the inner wall 11 is viewed from the direction intersecting the arrangement direction of the cylinders 10, that is, from the upper side of FIG. 2 (hereinafter, sometimes referred to as one side). A through hole 14 is provided which penetrates toward the lower side of 2 (hereinafter sometimes referred to as the other side) and has both ends opened to the outer peripheral surface of the inner wall 11.

  As shown in FIGS. 1 and 2, a top deck spacer 15 as a spacer member is provided on the outer periphery of the inner wall 11 so as to be in contact with the inner wall 11 over the entire periphery. The top deck spacer 15 is provided around the inner wall 11 so that the upper surface 15a thereof is at the same height as the top deck surface 2a. As shown in FIG. 2, both ends of the through hole 14 are opened in a portion of the outer peripheral surface of the inner wall 11 where the top deck spacer 15 is attached. The width of the top deck spacer 15 is set to a value smaller than the width of the water jacket groove 12 so that the water jacket groove 12 opens on the top deck surface 2a when the top deck spacer 15 is attached to the inner wall 11. The top deck spacer 15 is formed of a material having a smaller linear expansion coefficient than the material of the cylinder block 2. For example, the top deck spacer 15 is formed of an iron-based material with respect to the cylinder block 2 formed of an aluminum-based material.

  The top deck spacer 15 is an intermediate connecting the fitting portion 15b fitted around the cylinder wall portion 11a and the fitting portion 15b fitted on both sides of the coupling portion 11b so as to face each other across the coupling portion 11b. Part 15c. As shown in FIG. 1 and FIG. 2, an intermediate portion (hereinafter sometimes referred to as one intermediate portion) 15c arranged on one side of the coupling portion 11b and an intermediate portion (hereinafter referred to as one intermediate portion) (hereinafter referred to as one intermediate portion). , And may be referred to as the other intermediate portion.) 15c is connected by a bolt 16 as a connecting member. The bolt 16 passes through the through hole 14 and connects the one intermediate portion 15c and the other intermediate portion 15c. Moreover, the bolt 16 is provided in each coupling | bond part 11b, respectively, and connects a pair of intermediate part 15c arrange | positioned so that it may oppose on both sides of each coupling | bond part 11b, respectively.

  One intermediate portion 15c is provided with a first bolt hole 17 through which the bolt 16 is inserted. The first bolt hole 17 is provided with a recess 17a for receiving the head 16a so that the head 16a of the bolt 16 does not protrude from the side surface of the top deck spacer 15. The other intermediate portion 15c is provided with a second bolt hole 18 into which the tip of the bolt 16 is screwed. The second bolt hole 18 is formed with a female screw portion 18a into which the screw portion 16b of the bolt 16 is screwed. The first bolt hole 17 and the second bolt hole 18 are respectively provided in the top deck spacer 15 so as to be coaxial with the through hole 14 of the coupling portion 11 b when the top deck spacer 15 is fitted into the stepped portion 14. The first bolt hole 17 is provided so as to pass through one intermediate portion 15c in the same direction as the through hole 14 extends, and the second bolt hole 18 extends through the other intermediate portion 15c. It is provided so as to penetrate in the same direction as the direction. Then, each bolt 16 is screwed into the top deck spacer 15 so that a pair of intermediate portions 15c arranged so as to sandwich each coupling portion 11b is in close contact with the coupling portion 11b.

  FIG. 3 shows an example of a force acting on each part of the top deck spacer 15 when the inner wall 11 is going to deform outward due to thermal expansion or the like. As shown by the arrow F in FIG. 3, when the inner wall 11 of the internal combustion engine 1A is to be deformed outward due to thermal expansion or the like, a force pushing outward is applied to each part of the top deck spacer 15 due to this deformation. At this time, each intermediate portion 15c of the top deck spacer 15 is fitted to the intermediate portion 15c as shown by an arrow T in FIG. The tension generated because the joint portion 15b is deformed outward acts. Therefore, when the inner wall 11 is deformed due to thermal expansion or the like, each intermediate portion 15c may be separated from the inner wall 11 to the outside, so-called floating.

  In the internal combustion engine 1A according to the first embodiment of the present invention, one intermediate portion 15c and the other intermediate portion 15c are connected by the bolts 16 so that the pair of intermediate portions 15c are in close contact with the coupling portion 11b. It is possible to reliably prevent the intermediate portion 15c from floating from the inner wall 11 to the outside. Therefore, even if the top deck spacer 15 is deformed outward due to thermal expansion of the inner wall 11, the deformation of the top deck spacer 15 can be suppressed by the bolt 16. Therefore, the inner wall 11 can be securely tightened and restrained over the entire circumference by the top deck spacer 15, and deformation of the inner wall 11 can be suppressed as compared with the conventional case. Moreover, since the deformation | transformation of the cylinder 10 can be suppressed rather than before, the upper limit of the pressure in the cylinder 10 can be raised. And by suppressing the deformation | transformation of the cylinder 10, the partial wear which the cylinder 10 wears unevenly can be suppressed. Further, since the contact between the piston (not shown) and the cylinder 10 can be stably maintained, heat can be appropriately released from the piston to the cylinder 10. Thereby, generation | occurrence | production of the crack of a piston can be suppressed. In addition, since the friction between the piston and the cylinder 10 can be reduced, the fuel consumption of the internal combustion engine 1A can be improved. In the internal combustion engine 1A of the present invention, since the bolt 16 is disposed in the through hole 14 provided in the coupling portion 11b, the bolt 16 can be provided in the coupling portion 11b without protruding from the top deck surface 2a of the cylinder block 2. it can.

  The bolt 16 used in the internal combustion engine 1A of the first embodiment may be formed of a shape memory material that contracts when the temperature rises. For example, a bolt made of a Ni—Ti shape memory alloy may be used. By connecting one intermediate portion 15c and the other intermediate portion 15c with such a bolt 16, the bolt 16 is contracted when the temperature of the inner wall 11 rises, and the tightening force of the top deck spacer 15 is increased. Can do. Therefore, deformation of the inner wall 11 can be further suppressed. Further, in this case, since the bolt 16 contracts when the temperature rises, even if the gap between the inner wall 11 and the top deck spacer 15 is somewhat large, the top deck spacer 15 can be brought into close contact with the inner wall 11 by this contraction. Therefore, the processing accuracy required for processing the stepped portion 14 and the top deck spacer 15 can be lowered. Thereby, the processing cost of the cylinder block 2 or the top deck spacer 15 can be reduced.

(Second form)
4 and 5 show a main part of the internal combustion engine 1B according to the second embodiment of the present invention. 4 shows a cross-sectional view of the internal combustion engine 1B along line IV-IV in FIG. 5, and FIG. 5 shows a cross-sectional view of the internal combustion engine 1B along line V-V in FIG. As shown in FIGS. 4 and 5, this embodiment is different from the first embodiment except that a cooling water passage 20 is provided in the top deck spacer 15. Therefore, the same parts as those in the first embodiment are denoted by the same reference numerals, and description thereof is omitted. As shown in FIG. 4, the cooling water passage 20 is provided in each intermediate portion 15 c, opens to the upper surface 15 a of the top deck spacer 15, and intersects the first bolt hole 17 or the second bolt hole 18 from the upper surface 15 a. Thus, the top deck spacer 15 is penetrated in the height direction. The cooling water passage 20 provided in one intermediate portion 15c corresponds to the first cooling water passage of the present invention, and the cooling water passage 20 provided in the other intermediate portion 15c is the second cooling water passage of the present invention. It corresponds to.

  According to the internal combustion engine 1B of the second embodiment, as shown by an arrow A in FIG. 4, the cooling water is led from the water jacket groove 12 to each cooling water passage 20 provided in the top deck spacer 15 to penetrate the bolt 16. Cooling water can be introduced into the gap with the hole 14, and the coupling portion 11b can be cooled with this cooling water. Since the coupling portion 11b provided between the cylinders 10 is less likely to be cooled than the other portions of the cylinder block 2, the cooling water is introduced into the through hole 14 in this manner to cool the coupling portion 11b. 2 can be improved, and the upper limit of the heat load that can be applied to the cylinder block 2 can be made higher than before. Therefore, the performance of the internal combustion engine 1B can be improved.

(Third form)
An internal combustion engine 1C according to a third embodiment of the present invention will be described with reference to FIG. FIG. 6 is a diagram corresponding to FIG. 4 in the second embodiment. As shown in FIG. 6, in this embodiment, the cooling water passage 3b of the cylinder head 3 is placed on the lower surface 3a of the cylinder head 3 so as to face the opening of each cooling water passage 20 opened on the upper surface 15a of the top deck spacer 15. The difference is that the discharge port 3c is opened. Other than that, the second embodiment is the same as the second embodiment. Therefore, in this embodiment, the same reference numerals are given to the same parts as the second embodiment, and the description is omitted. Moreover, since the cooling water path 3b of the cylinder head 3 is a well-known thing provided in the cylinder head 3 in order to distribute | circulate a cooling water, detailed description is abbreviate | omitted. As shown in FIG. 6, in the internal combustion engine 1C, the cooling water passage 3b of the cylinder head 3 and the cooling water passage 20 of the top deck spacer 15 communicate with each other. Cooling water can be supplied to the passage 20 from the cooling water passage 3 b of the cylinder head 3.

  According to the internal combustion engine 1C of the third embodiment, the cooling water is supplied from the cooling water passage 3b of the cylinder head 3 to each cooling water passage 20 as shown by the arrow A in FIG. Since it can be forced to flow, it is possible to prevent the cooling water from staying in the through hole 14 for a long time. Therefore, the cooling of the coupling part 11b can be further promoted. Moreover, the coupling | bond part 11b can be cooled more reliably.

(4th form)
An internal combustion engine 1D according to a fourth embodiment of the present invention will be described with reference to FIG. FIG. 7 is a diagram corresponding to FIG. 4 in the second embodiment as in FIG. As shown in FIG. 7, the internal combustion engine 1D includes a cooling water inlet passage 21 provided in one intermediate portion 15c and a cooling water outlet passage 22 provided in the other intermediate portion 15c. The cooling water inlet passage 21 is provided from the upper surface 15 a of the top deck spacer 15 to the first bolt hole 17. The cooling water outlet passage 22 is provided from the second bolt hole 18 to the lower surface 15d of the top deck spacer 15 facing the step portion 14. Further, a discharge port 3 c of the cooling water passage 3 b is provided on the lower surface 3 a of the cylinder head 3 at a portion facing the cooling water inlet passage 21. Since other than that is the same as the first embodiment described above, the same reference numerals are given to the same parts as the first embodiment, and the description will be omitted.

  In the internal combustion engine 1D of the fourth embodiment, as shown by an arrow A in FIG. 7, almost the entire amount of the cooling water flowing into the cooling water inlet passage 21 from the cooling water passage 3b of the cylinder head 3 passes through the through hole 14. It is led to the cooling water outlet passage 22. Therefore, compared with the 2nd form and 3rd form mentioned above, the flow volume of the cooling water which passes the inside of the through-hole 14 can be increased. Further, this can increase the flow rate of the cooling water in the through hole 14. Thus, heat transfer from the cylinder block 2 to the cooling water can be promoted by increasing the flow rate of the cooling water or increasing the flow velocity. Therefore, cooling of the coupling part 11b of the cylinder block 2 can be further promoted.

  The cooling water inlet passage 21 may be provided in the other intermediate portion 15c, and the cooling water outlet passage 22 may be provided in the one intermediate portion 15c. In this case, the discharge port 3c of the cooling water passage 3b provided on the lower surface 3a of the cylinder head 3 is provided so as to face the cooling water inlet passage 21 of the other intermediate portion 15c. Also in this case, since almost the entire amount of the cooling water flowing into the cooling water inlet passage 21 passes through the through hole 14, the flow rate of the cooling water flowing through the through hole 14 can be increased and the flow rate of the cooling water can be increased. Therefore, the cooling of the coupling part 11b can be further promoted.

(5th form)
An internal combustion engine 1E according to a fifth embodiment of the present invention will be described with reference to FIGS. FIG. 8 is an enlarged view showing a main part of the internal combustion engine 1E, and corresponds to FIG. 2 of the first embodiment. FIG. 9 is an enlarged view of a part of the intermediate portion 15c of the internal combustion engine 1E. As shown in FIG. 8, in the internal combustion engine 1 </ b> E, an attachment portion 30 is provided at the tip of each intermediate portion 15 c, and an elastic contact portion 31 is attached to the attachment portion 30. That is, in the internal combustion engine 1E, the contact portion 31 is provided between the intermediate portion 15c and the coupling portion 11b. As a material of the contact part 31, for example, rubber or soft resin is used. The height of the contact portion 31 is set to the same value as the height of the top deck spacer 15. As shown in FIGS. 8 and 9, a cooling water passage 20 through which cooling water is guided is provided in the intermediate portion 15 c of the top deck spacer 15 of this embodiment as in the second to fourth embodiments described above. As shown in FIG. 9, each contact portion 31 is provided with a through hole 31a through which the bolt 16 is inserted. The through hole 31 a is provided in the contact portion 31 so as to be coaxial with the first bolt hole 17 or the second bolt hole 18 when the contact portion 31 is attached to the attachment portion 30.

  According to the internal combustion engine 1E of the fifth embodiment, the contact portions 31 of the intermediate portion 15c can be brought into close contact with the coupling portions 11b by tightening the bolts 16 until the contact portions 31 are deformed. Thereby, it is possible to prevent the cooling water from leaking between the coupling portion 11b and the contact portion 31, and to prevent the flow rate of the cooling water guided to the through hole 14 from being lowered. Therefore, cooling of the coupling part 11b can be further promoted. Further, since the contact portion 31 is made of an elastic body, the contact portion 31 can be brought into close contact with the coupling portion 11b by deformation of the contact portion 31 if the shape of the contact portion 31 substantially matches the shape of the coupling portion 11b. . Therefore, the processing accuracy required for processing the contact portion 31 can be lowered. This also reduces the processing cost of the top deck spacer 15.

  This invention is not limited to each form mentioned above, It can implement with a various form. For example, in each embodiment described above, the through hole is provided in parallel to the top deck surface of the cylinder block, but the through hole may be inclined with respect to the top deck surface. In addition, the connecting member that connects the pair of intermediate portions opposed to each other with the coupling portion interposed therebetween is not limited to the bolt, and may be, for example, a pin that can connect the pair of intermediate portions.

The figure which shows the principal part of the internal combustion engine which concerns on the 1st form of this invention. The figure which shows the cross section of the internal combustion engine in the II-II line | wire of FIG. The figure which shows an example of the force which acts on each part of a top deck spacer. The figure which shows the principal part of the internal combustion engine which concerns on the 2nd form of this invention. The figure which shows the cross section of the internal combustion engine in the VV line | wire of FIG. The figure which shows the principal part of the internal combustion engine which concerns on the 3rd form of this invention. The figure which shows the principal part of the internal combustion engine which concerns on the 4th form of this invention. The figure which shows the principal part of the internal combustion engine which concerns on the 5th form of this invention. The figure which expands and shows a part of top deck spacer of FIG.

Explanation of symbols

1A, 1B, 1C, 1D, 1E Internal combustion engine 2 Cylinder block 2a Top deck surface 3 Cylinder head 3a Lower surface 3b Cooling water path 3c Discharge port 10 Cylinder 11 Inner wall 11a Cylinder wall portion 11b Coupling portion 12 Water jacket groove 13 Outer wall 14 Through hole 15 Top deck spacer (spacer member)
15a Upper surface 15c Intermediate part 16 Bolt (connection member)
17 1st bolt hole 18 2nd bolt hole 18a Female thread part 20 Cooling water passage (1st cooling water passage, 2nd cooling water passage)
21 Cooling water inlet passage 22 Cooling water outlet passage 31 Contact portion

Claims (6)

A plurality of cylinders arranged in one direction are formed, an inner wall having a cylinder wall portion forming the cylinder and a coupling portion for coupling cylinder wall portions of adjacent cylinders, and a water jacket groove sandwiched around the inner wall In an internal combustion engine comprising a cylinder block having an outer wall provided by the cylinder block, wherein the inner wall and the outer wall are separated by a water jacket groove on a top deck surface facing the cylinder head,
A spacer member provided on the outer periphery of the inner wall so as to be in contact with the inner wall, and penetrates the coupling portion in a direction intersecting with an arrangement direction of the plurality of cylinders, and both ends are outer peripheral surfaces of the inner wall. A connecting member that connects the pair of intermediate portions through the through-hole so that a through-hole that opens to a pair of intermediate portions of the spacer member that are opposed to each other with the coupling portion interposed therebetween And an internal combustion engine comprising:   The internal combustion engine according to claim 1, wherein the connecting member is formed of a shape memory material that contracts in response to a rise in temperature. The connecting member is a bolt;
The first intermediate portion of the pair of intermediate portions is disposed coaxially with the through hole, passes through the one intermediate portion in the same direction as the direction in which the through hole extends, and the bolt is inserted through the first intermediate portion. 1 bolt hole is provided, and the other intermediate portion of the pair of intermediate portions is disposed coaxially with the through hole and penetrates the other intermediate portion in the same direction as the through hole extends, And the 2nd bolt hole in which the internal thread part into which the said bolt is screwed is formed is provided,
The one intermediate portion opens to the upper surface of the spacer member that communicates with the first bolt hole and faces the cylinder head, and penetrates the spacer member in a direction intersecting the first bolt hole from the upper surface. A first cooling water passage is provided,
The other intermediate portion communicates with the second bolt hole and opens on the upper surface of the spacer member, and passes through the spacer member in a direction intersecting the second bolt hole from the upper surface. The internal combustion engine according to claim 1, wherein the internal combustion engine is provided.   The lower surface of the cylinder head that faces the upper surface of the spacer member is opposed to the opening of the first cooling water passage and the opening of the second cooling water passage that open to the upper surface of the spacer member. The internal combustion engine according to claim 3, wherein a plurality of discharge ports through which cooling water is discharged from the cooling water passage of the cylinder head are provided. The connecting member is a bolt;
The pair of intermediate portions are respectively provided with bolt holes that are arranged coaxially with the through holes and penetrate the intermediate portions in the same direction as the through holes extend, and through which the bolts pass.
One intermediate portion of the pair of intermediate portions is provided with a cooling water inlet passage that opens to the upper surface of the spacer member facing the cylinder head and is formed from the upper surface to the bolt hole.
A cooling water outlet passage formed from the bolt hole to the outer surface of the spacer member is provided in the other intermediate portion of the pair of intermediate portions,
Cooling water is discharged from the cooling water passage of the cylinder head on the lower surface of the cylinder head facing the upper surface of the spacer member so as to face the opening of the cooling water inlet passage opening on the upper surface of the spacer member. The internal combustion engine according to claim 1 or 2, wherein a discharge port is provided.   Each intermediate portion of the spacer member is provided with a contact portion made of an elastic body at a portion of the outer surface in contact with the coupling portion that is in contact with at least the periphery of the opening of the through hole that is open on the outer peripheral surface of the inner wall. The internal combustion engine according to any one of claims 3 to 5.

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