JP2012189064A - Water jacket with spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water jacket with a spacer that can perform space adjustment having higher degree of freedom.SOLUTION: Regarding the water jacket formed so that a sand removal hole 10 penetrates through a cooling liquid passage 2 in molding a cylinder block, a spacer member 12, which is expanded by a cooling liquid, is mounted on a support 11 fixed to the sand removal hole 10 so as to block the sand removal hole 10. The support 11 is provided with a protrusion 11a protruding from an opening surface of the sand removal hole 10 within the cooling liquid passage 2. The spacer member 12 is mounted on the protrusion 11a.

Description

  The present invention relates to a water jacket for an internal combustion engine, and more particularly to a water jacket with a spacer to which a spacer for adjusting a flow of a coolant is attached.

  In general, in a cylinder block and a cylinder head of an internal combustion engine, it is known to adjust the flow path of the coolant by installing a spacer in the water jacket in order to adjust the flow of the coolant. Conventionally, as such a water jacket with a spacer, for example, there is one described in Patent Document 1. FIG. 9 shows an example of a cross-sectional structure of the water jacket with a spacer described in Patent Document 1.

  In the water jacket shown in FIG. 9, the spacer 100 has a property of expanding by the coolant, and here, the spacer member 120 in a compressed state is supported so as to be sandwiched between the support members 110, and the water jacket is shown. It is attached to an attachment hole 140 provided in the passage wall 130 of the jacket. Then, once the coolant flows, the spacer member 120 expands in a manner indicated by a broken line in FIG. 9 and blocks a part of the passage serving as the water jacket to restrict the flow of the coolant. As described above, by providing the spacer 100 that is expanded by the cooling liquid at an appropriate position in the water jacket, it is possible to appropriately cool the cylinder block or the cylinder head by adjusting the flow of the cooling liquid. Become.

JP 2005-90311 A

  By the way, as for the spacer member used as the spacer 100 in such a water jacket with a spacer, a member that easily expands in the thickness direction is usually used from the viewpoint of production efficiency. Therefore, even in the conventional water jacket with a spacer illustrated in FIG. 9, most of the spacer members 120 expand in the opening direction of the mounting hole 140, and the range in which the water jacket can be closed is also illustrated in FIG. 9. It is limited to the broken line portion indicated by X. In other words, the range in which the flow of the coolant can be limited as the spacer 100 has a low degree of freedom that must be limited by the opening area of the mounting hole 140. In addition, in an internal combustion engine that is in mass production, it is difficult to change specifications that enlarge the size of the mounting hole 140 itself.

  The present invention has been made in view of such circumstances, and an object of the present invention is to provide a water jacket with a spacer that enables a space adjustment with a higher degree of freedom by a spacer.

Hereinafter, means for solving the above-described problems and the effects thereof will be described.
The invention according to claim 1 is a mode in which a spacer member that is expanded by a coolant closes the sand vent hole with respect to a water jacket formed in such a manner that the sand vent hole at the time of forming the cylinder block penetrates the coolant passage. A water jacket with a spacer attached to a support fixed to the sand removal hole, wherein the support is provided with a protrusion protruding into the coolant passage from the opening surface of the sand removal hole. The gist of the spacer member is attached to the convex portion.

  According to the above configuration, it is possible to select various expansion modes of the spacer member depending on how the convex portion is provided on the support or how the spacer member is attached to the convex portion, and as a result, the space in the water jacket can be adjusted. Such a degree of freedom is also improved. In addition, since a sand removal hole at the time of forming the cylinder block is used as a hole for attaching the spacer, it is not necessary to change the specification as a cylinder block and can be easily applied to an internal combustion engine in mass production. .

  The invention according to claim 2 is the water jacket with a spacer according to claim 1, wherein the convex portion extends from the support body in a direction perpendicular to an opening surface of the sand removal hole, and the cooling liquid. It protrudes inside the passage, and the gist of the invention is that the mounting surface of the spacer member to the convex portion includes the peripheral surface of the portion extending in the vertical direction.

  According to the above configuration, the spacer member can be expanded in a wider range such as a direction parallel to the opening surface of the sand removal hole. Therefore, it is easier to secure the degree of freedom for adjusting the space in the water jacket.

  According to a third aspect of the present invention, in the water jacket with a spacer according to the second aspect, the spacer member attached to the peripheral surface of the extended portion of the convex portion is formed in the sand hole of the support. The gist is that the fixed portion is caulked and fixed by a caulking portion formed by folding outward.

According to the above configuration, the attachment of the spacer member to the support including the peripheral surface of the convex portion can be stably realized by a simple method such as “caulking”.
According to a fourth aspect of the present invention, in the water jacket with a spacer according to the first aspect, the convex portion is extended from the support body so as to include an inclined surface with respect to an opening surface of the sand removal hole. It protrudes into the inside of the passage, and the gist of the invention is that the attachment surface of the spacer member to the convex portion also includes this extended inclined surface.

  According to the said structure, it becomes possible to expand a spacer member in a wider range, such as the direction inclined to the opening surface of a sand removal hole. Therefore, it is easier to secure the degree of freedom for adjusting the space in the water jacket. Moreover, it becomes easy to select various expansion modes of the spacer member by adjusting the inclination angle of the inclined surface.

  According to a fifth aspect of the present invention, in the water jacket with a spacer according to the fourth aspect, the spacer member attached to the inclined surface of the convex portion is on the tip side of the inclined surface and constitutes the support body. The gist is that the plate material is caulked and fixed by caulking portions formed by folding back to the inclined surface side.

According to the above configuration, the attachment of the spacer member to the support including the inclined surface of the convex portion is stably realized by a simple method such as “caulking”.
The invention according to claim 6 is characterized in that, in the water jacket with a spacer according to claim 3 or 5, a slit is formed on the expansion-permitting surface of the caulking fixed portion of the spacer member. .

  According to the above configuration, the expansion of the spacer member is allowed in such a manner that the restriction by the support (caulking portion) is minimized.

Sectional drawing which shows the cross-section of the cylinder block in which the water jacket with a spacer is provided about 1st Embodiment of the water jacket with a spacer concerning this invention. Sectional drawing which shows the cross-section of the spacer used with the water jacket with a spacer concerning 1st Embodiment. (A) is sectional drawing which shows the cross-sectional structure before the cooling fluid distribution | circulation of the water jacket with a spacer concerning 1st Embodiment. (B) is sectional drawing which shows the cross-section after the cooling fluid distribution | circulation of the water jacket with a spacer concerning the 1st Embodiment. (A) is sectional drawing which shows the cross-sectional structure before the coolant distribution about the comparative example 1 of the water jacket with a spacer. (B) is sectional drawing which shows the cross-sectional structure after the cooling fluid distribution | circulation about the comparative example 1. FIG. (A) is sectional drawing which shows the cross-sectional structure before the coolant distribution about the comparative example 2 of the water jacket with a spacer. (B) is sectional drawing which shows the cross-sectional structure after the cooling fluid distribution | circulation about the comparative example 2. FIG. Sectional drawing which shows the cross-section of the spacer used with the water jacket about 2nd Embodiment of the water jacket with a spacer concerning this invention. (A) is sectional drawing which shows the cross-sectional structure before the cooling fluid distribution | circulation of the water jacket with a spacer concerning 2nd Embodiment. (B) is sectional drawing which shows the cross-section after the cooling fluid distribution | circulation of the water jacket with a spacer concerning the said 2nd Embodiment. Sectional drawing which shows the cross-section of the spacer used with the water jacket with a spacer concerning a modification. Sectional drawing which shows the cross-section about the conventional water jacket with a spacer.

(First embodiment)
Hereinafter, a first embodiment of a water jacket with a spacer according to the present invention will be described with reference to FIGS. In this embodiment, the present invention is applied to a cylinder block having a closed deck structure.

  As shown in FIG. 1, a coolant passage 2 is formed in a cylinder block provided with a water jacket with a spacer according to this embodiment so as to surround the outer periphery of the cylinder bore 1. And the sand removal hole 10 at the time of cylinder block shaping | molding is formed in the aspect penetrated to the cooling fluid channel | path 2 from the outer side of a cylinder block. FIG. 1 corresponds to a cross-sectional view taken along line AA in FIG. 3A described below. In the cylinder block illustrated here, a sand removal hole 10 is provided on the long side. A total of eight are provided at positions facing each other with the cylinder bores 1 in between.

  A support 11 made of a metal plate is fitted and fixed to the sand removal hole 10 as a plug, thereby closing the sand removal hole 10. Among these, spacer members 12 are attached to the support bodies 11 at the two right and three left sides in FIG. The spacer member 12 is made of an elastic material having water swellability and thermal expansion property with respect to a liquid used as a cooling liquid, such as foam rubber, and swells or expands in response to the temperature of the cooling liquid by absorption of the cooling liquid. It has the characteristic to do. Therefore, after the circulation of the coolant, it is possible to make adjustments such as allowing more coolant to circulate through the portion that needs to be cooled, such as the spacer member 12 expanding to partially block the coolant passage 2.

Next, the structure of the spacer used in this embodiment will be described in detail.
As shown in FIG. 2, the support 11 has a convex portion 11a. 3A, when the support 11 is fixed to the sand removal hole 10, the protrusion 11a protrudes from the opening surface of the sand removal hole 10 into the coolant passage 2. The sand removal hole 10 is extended in the direction perpendicular to the opening surface. As shown in FIG. 2, the spacer member 12 is attached along the entire surface of the support 11 including the peripheral surface of the protrusion 11 a extending in the vertical direction.

  Further, the portion of the support 11 that is fitted and fixed to the sand removal hole 10 is folded outward to form a caulking portion 11b for fixing the spacer member, and the end of the spacer member 12 is placed in the folded space. The spacer member 12 is attached to the support body 11 by being clamped and fixed.

  Further, a slit 12a is formed in the expansion allowing surface of the portion of the spacer member 12 which is fixed by caulking, in a direction orthogonal to the folded caulking portion 11b of the support 11, that is, perpendicular to the expansion allowing surface.

  In addition, the diameter d1 of the spacer member 12 in the direction parallel to the opening surface of the sand removal hole 10 is formed to be equal to or less than the diameter d2 of the support 11 in the same direction, that is, the diameter of the opening surface of the sand removal hole 10. Incidentally, in the example here, the diameter d1 is formed smaller than the diameter d2.

  As shown in FIG. 3A, the spacer configured as described above is inserted into the sand removal hole 10 from the outside of the cylinder block and fixed, thereby forming a water jacket with a spacer. At this time, since the diameter d1 of the spacer member 12 is formed to be equal to or smaller than the diameter d2 of the support 11 as described above, it can be easily inserted into the sand removal hole 10 and is assembled to the closed deck cylinder block. It's easy to assemble and automate with machines.

Next, the operation of the water jacket with spacers of this embodiment configured as described above will be described.
When the coolant flows after the spacers are assembled, as shown in FIG. 3B, the spacer member 12 expands and approaches or closely contacts the passage wall of the coolant passage 2. At this time, since the spacer member 12 is also attached to the peripheral surface of the portion extending in the vertical direction of the convex portion 11a, not only in the opening direction of the sand removal hole 10, but also in the direction parallel to the opening surface. The spacer member 12 expands. Therefore, the spacer member 12 can be expanded over a wider range including the direction parallel to the opening surface of the sand removal hole 10. As a result, the degree of freedom for adjusting the space in the water jacket is naturally increased, and depending on the adjustment mode of the space adjustment, it is possible to improve the cooling efficiency for cooling the cylinder block.

  In addition, since the slit 12a is formed on the expansion allowing surface of the portion where the spacer member 12 is fixed by caulking, the spacer member 12 is allowed to expand in such a manner that the restriction by the caulking portion 11b of the support 11 is minimized. It also comes to be.

Here, the operation of the water jacket with a spacer according to the embodiment will be described in more detail with reference to the comparative examples shown in FIGS.
As shown in FIG. 4 (a), in Comparative Example 1 using the support body 21 on which no convex portion is formed, the spacer member 22 is inserted into the sand removal hole 10 as shown in FIG. 4 (b). It can be expanded only in the opening direction. For this reason, the degree of freedom for adjusting the space in the water jacket is also naturally low.

Further, as shown in FIG. 5 (a), in Comparative Example 2 using the spacer member 32 in which no slit is formed, the spacer member 32 is inserted into the sand hole 10 as shown in FIG. 5 (b). Although it is possible to inflate in a direction parallel to the opening surface, the expansion of the expansion permissible surface is naturally restricted in the vicinity of the caulking and fixed portion. That is, the degree of freedom for space adjustment is improved as compared with Comparative Example 1 illustrated in FIG. However, the degree of freedom for space adjustment is not increased as much as the water jacket with spacers of the above embodiment.

As described above, according to the water jacket with spacers according to this embodiment, the effects listed below can be obtained.
(1) A protrusion 11a that protrudes from the opening surface of the sand removal hole 10 to the inside of the coolant passage 2 is provided on the support 11 fixed to the sand removal hole 10 at the time of cylinder block molding. On the other hand, the spacer member 12 was attached. Therefore, it is possible to select various expansion modes of the spacer member 12 according to how the convex portion 11a is provided on the support 11 or how the spacer member 12 is attached to the convex portion 11a, thereby adjusting the space in the water jacket. The degree of freedom required for this will be improved. Further, since the sand removal hole 10 is used as a hole for attaching the spacer, it is not necessary to change the specification as a cylinder block and can be easily applied to an internal combustion engine in mass production.

  (2) In particular, the convex portion 11a is formed so as to extend in a direction perpendicular to the opening surface of the sand removal hole 10 and protrude into the coolant passage 2, and the spacer member 12 is formed in this vertical direction. It was made to attach to the convex part 11a also including the surrounding surface of the extended part. Therefore, it is possible to expand the spacer member 12 in a wider range including the direction parallel to the opening surface of the sand removal hole 10, and it becomes easier to secure the degree of freedom for adjusting the space in the water jacket.

  (3) The spacer member 12 attached to the peripheral surface of the extended portion of the convex portion 11a is caulked by the caulking portion 11b formed by folding the portion fixed to the sand removal hole 10 of the support 11 outward. I decided to fix it. Therefore, the attachment of the spacer member 12 to the support 11 including the peripheral surface of the convex portion 11a is stably realized by a simple method such as “caulking”.

(4) The slit 12a is formed on the expansion-permitting surface of the portion of the spacer member 12 that has been caulked and fixed. For this reason, the expansion of the spacer member 12 is allowed in such a manner that the restriction by the support 11 (caulking portion 11b) is minimized.
(Second Embodiment)
Next, a second embodiment of the water jacket with a spacer according to the present invention will be described with reference to FIGS. 6 and 7 with a focus on differences from the first embodiment. The basic structure of the water jacket with a spacer according to this embodiment is the same as that of the first embodiment, and in FIGS. 6 and 7, substantially the same as that of the first embodiment. Elements are denoted by the same reference numerals, and redundant description is omitted.

  Similarly to the first embodiment, the water jacket with a spacer according to this embodiment has a configuration in which a spacer composed of a support body 41 and a spacer member 42 is fixed to a sand removal hole 10 formed in the water jacket. Become. However, this embodiment is different from the first embodiment in the shape of the spacer. Hereinafter, the shape and configuration of the spacer used in this embodiment will be described in detail.

  As shown in FIG. 6, the support body 41 has the convex part 41a. As shown in FIG. 7A, the convex portion 41 a is also formed so as to protrude from the opening surface of the sand removal hole 10 into the coolant passage 2 when the support body 41 is fixed to the sand removal hole 10. ing. However, as shown in detail in FIG. 6, the convex portion 41 a is formed to extend including an inclined surface 41 c with respect to the opening surface of the sand removal hole 10. The inclined surface 41c is formed so as to be inclined inward from a portion 41b fitted and fixed to the sand removal hole 10 of the support body 41, and the tip end side thereof is connected to the flat surface 41d.

  Further, on the flat surface 41d, the same plate material as that of the metal plate constituting the support body 41 is folded back in a hook shape on the inclined surface side to form a caulking portion 41e for fixing the spacer member. The spacer member 42 is attached along the inclined surface 41c from the flat surface 41d of the support body 41, and the end portion on the flat surface 41d side is sandwiched in the folded space of the caulking portion 41e and caulked. It is fixed.

  Furthermore, a slit 42a is formed in the expansion allowing surface of the portion of the spacer member 42 that is fixed by caulking, in a direction perpendicular to the folded caulking portion 41e of the support 41, that is, perpendicular to the expansion allowing surface.

  Also in this embodiment, the diameter d1 of the spacer member 42 in the direction parallel to the opening surface of the sand removal hole 10 is the same as the diameter d2 of the support body 41, that is, the diameter of the opening surface of the sand removal hole 10. It is formed as follows. Incidentally, in the example here, the diameter d1 is formed equal to the diameter d2.

  As shown in FIG. 7A, the spacer configured as described above is inserted into the sand removal hole 10 from the outside of the cylinder block and fixed, thereby forming a water jacket with a spacer.

Next, the operation of the water jacket with spacers of this embodiment configured as described above will be described.
When the coolant flows after the spacers are assembled, as shown in FIG. 7B, the spacer member 42 expands and approaches or closely contacts the passage wall of the coolant passage 2. At this time, since the spacer member 42 is also attached to the inclined surface 41c of the convex portion 41a, the spacer member 42 is not only in the opening direction of the sand removal hole 10, but also in the direction inclined from the opening surface of the sand removal hole 10. Expands. Therefore, the spacer member 42 can be expanded over a wider range. As a result, the degree of freedom for adjusting the space in the water jacket is naturally increased, and, as in the first embodiment, depending on the adjustment mode of the space adjustment, the cooling efficiency for cooling the cylinder block can be reduced. Improvement is also possible.

  In addition, since the slit 42a is formed on the expansion allowing surface of the portion where the spacer member 42 is fixed by caulking, the spacer member 42 is allowed to expand in such a manner that the restriction by the caulking portion 41e of the support body 41 is minimized. It also comes to be.

  As described above, according to the water jacket with a spacer according to this embodiment, in addition to the effects (1) and (4) of the first embodiment, there are effects listed below. It will be obtained.

  (5) In particular, the convex portion 41a is formed so as to protrude into the coolant passage 2 including the inclined surface 41c with respect to the opening surface of the sand removal hole 10, and the spacer member 42 is provided with the extended inclined surface. It was made to attach to the convex part 41a including 41c. Therefore, it is possible to expand the spacer member 42 in a wider range including the direction inclined to the opening surface of the sand removal hole 10, and it becomes easier to ensure the degree of freedom for adjusting the space in the water jacket. In addition, by adjusting the inclination angle of the inclined surface 41c, various expansion modes of the spacer member 42 can be easily selected.

(6) A caulking portion 41e formed by folding the spacer member 42 attached to the inclined surface 41c of the convex portion 41a on the distal end side of the inclined surface 41c and the plate material constituting the support 41 on the inclined surface 41c side. It was decided to fix by caulking. Therefore, the attachment of the spacer member 42 to the support body 41 including the inclined surface 41c of the convex portion 41a is stably realized by a simple method such as “caulking”.
(Other embodiments)
In addition, each said embodiment can also be implemented with the following forms.

  In each of the above embodiments, the spacer member is caulked and fixed to the support body by forming the caulking portion on the support body. However, the present invention is not limited to this. For example, the spacer member is fixed to the support body by an adhesive or the like. It may be. In this case, for example, as shown in FIG. 8, a spacer member 52 is attached to the convex portion 51a of the support 51 having no caulking portion by adhesion. At this time, if the gap 52 a is provided between the base of the convex portion 51 a and the spacer member 52, the expansion of the spacer member 52 is not restricted by the support body 51. In FIG. 8, the convex portion 51a is provided so as to extend in the vertical direction from the support body 51, but may be extended so as to include an inclined surface. In addition, it is desirable to employ caulking fixing in terms of durability of the fixed spacer member.

  In each of the above embodiments, the slit is formed perpendicular to the expansion allowance surface in the expansion allowance surface of the caulking fixed portion of the spacer member, but the slit does not need to be perpendicular to the expansion allowance surface. That is, even if it is not necessarily perpendicular to the expansion permitting surface, the effect according to the above (4) can be obtained as long as the slit is formed. Moreover, as shown in Comparative Example 2 (FIG. 5), it is not always necessary to form a slit depending on the application.

  In the second embodiment, the inclined surface 41c is uniformly extended from the support body 41. For example, a part of the inclined surface 41c extends in the vertical direction as in the first embodiment, or the inclined surface 41c is inclined. Variations such as forming one or a plurality of inclined surfaces 41c with different angles are also possible. In short, the convex portion 41a may be formed so that the inclined surface is included in the portion extending from the support body 41.

  In each of the above embodiments, the position of the sand removal holes with respect to the cylinder block, and the number and arrangement of the sand removal holes for attaching the spacers are arbitrary.

  2 ... Coolant passage, 10 ... Sand vent hole, 11, 21, 31, 41, 51, 110 ... Support, 11a, 41a, 51a ... Convex part, 11b, 41e ... Caulking part, 41c ... Inclined surface, 12, 22, 32, 42, 52, 120 ... spacer members, 12a, 42a ... slits.

Claims (6)

A support in which a spacer member that is expanded by cooling liquid is fixed to the sand removal hole in a manner that closes the sand removal hole with respect to a water jacket formed in such a manner that the sand removal hole at the time of forming the cylinder block penetrates the coolant passage. A water jacket with a spacer attached to the body,
The support is provided with a convex portion that protrudes into the coolant passage from the opening surface of the sand removal hole, and the spacer member is attached to the convex portion. With water jacket. The convex portion extends in a direction perpendicular to the opening surface of the sand removal hole from the support and protrudes into the coolant passage, and is provided on a mounting surface of the spacer member to the convex portion. The water jacket with a spacer according to claim 1, including a peripheral surface of a portion extending in the vertical direction. The spacer member attached to the peripheral surface of the extended portion of the convex portion is formed by caulking and fixing by a caulking portion formed by folding the portion fixed to the sand removal hole of the support body outward. The water jacket with a spacer according to claim 2. The convex portion is extended from the support body including an inclined surface with respect to the opening surface of the sand removal hole and protrudes into the coolant passage, and is attached to the convex surface of the spacer member. The water jacket with a spacer according to claim 1, wherein the extended inclined surface is also included. The spacer member attached to the inclined surface of the convex portion is formed by being caulked and fixed by a caulking portion formed on a tip side of the inclined surface and a plate material constituting the support being folded back to the inclined surface side. Item 5. A water jacket with a spacer according to Item 4. The water jacket with a spacer according to claim 3 or 5, wherein a slit is formed in an expansion permitting surface of the caulking and fixing portion of the spacer member.

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