JP2007247590A - Water jacket spacer and method for installing water jacket spacer - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To easily attach a water jacket spacer at an arbitrary position in a water jacket in relation to the water jacket spacer and a method for installing the same. <P>SOLUTION: The water jacket spacer 1 is installed in a cylinder block of a semi-open deck structure including the water jacket continuously provided along a circumference direction of a cylinder as a channel of cooling water at an outer circumference of a cylinder, and a bridge connecting one side surface and another side surface forming an inner wall surface of the water jacket in a radial direction of the cylinder. The water jacket spacer is provided with a plate part 2 formed in a surface shape to be arranged between one side surface and another side surface of the water jacket and a hook part 3 projectingly provided in a hook shape from an upper end part of the plate part 2 to be hung down from the bridge of the plate part 2. <P>COPYRIGHT: (C)2007,JPO&INPIT

Description

  The present invention relates to a water jacket spacer installed in a water jacket of an engine and a mounting method thereof.

  Conventionally, in a cylinder block of a water-cooled engine, a water channel called a water jacket is formed in the outer peripheral portion of the cylinder, and the engine is cooled by cooling water flowing through the water jacket. The water jacket extends, for example, between the cylinder liner and the outer wall of the cylinder block so as to surround the outer peripheral side of the cylindrical surface of the cylindrical cylinder and extends in the cylindrical axis direction. It has a shape that can be cooled. Generally, the cylinder block is classified into a closed deck, an open deck, and a semi-open deck according to the arrangement shape of the water jacket.

  The closed deck means that the upper surface of the water jacket is completely closed, and has a characteristic that relatively high rigidity is easily obtained. On the other hand, an open deck refers to a water jacket whose upper surface is open to the cylinder head (not closed). Although it is inferior to a closed deck in terms of rigidity, it closes the upper part of the water jacket. Since there is no member, the upper part of the cylinder liner can be efficiently cooled.

  The semi-open deck combines the advantages of these closed decks and open decks, with a bridge that connects and reinforces the cylinder liner and the cylinder block outer wall, and partially closes the top of the water jacket. It is. With such a configuration, the cooling performance of the upper portion of the cylinder liner can be improved while ensuring high rigidity.

  By the way, since combustion is performed on the upper side of the cylinder block in a general engine, the temperature distribution in the cylinder liner is not uniform in the axial direction of the cylinder, and the upper side is hotter than the lower side. Therefore, even if the cooling capacity (for example, cooling water temperature, flow rate, etc.) required for the cooling water flowing through the water jacket is calculated based on the total amount of heat generated in the cylinder, uneven cooling occurs in the cylinder axial direction and the cylinder cylinder There is a possibility that the upper side of the surface cannot be sufficiently cooled and that the lower side of the cylinder surface is overcooled.

For such a problem, for example, a cooling structure as described in Patent Document 1 has been proposed. That is, a water jacket spacer for adjusting the flow and flow rate of cooling water is attached to the inside of the water jacket. With such a configuration, the temperature distribution of the cooling water in the water jacket can be adjusted.
JP 2004-19473 A

However, in the technique described in Patent Document 1, the position where the water jacket spacer can be attached is only below the part where the upper part of the water jacket in the cylinder block of the semi-open deck is opened, and is connected by a bridge. It is difficult to attach a water jacket spacer below the part.
That is, there is a problem that a bridge cannot be disposed at a position where the water jacket spacer is to be attached, and the design restrictions on the cylinder block are large. On the other hand, if the bridge disposition position is designed taking into account only the rigidity of the cylinder block, for example, the attachment position of the water jacket spacer is limited, and the cooling performance in the water jacket may not be sufficiently improved.

Thus, in the semi-open deck cylinder block, there is a problem that it is difficult to achieve both the rigidity of the cylinder block and the assembling property of the water jacket spacer.
The present invention has been devised in view of such problems, and provides a water jacket spacer and a mounting method of the water jacket spacer that can be easily attached to any position in the water jacket with a simple configuration. With the goal.

  In order to achieve the above object, a water jacket spacer according to the present invention (Claim 1) includes: a water jacket continuously provided along a circumferential direction of the cylinder as a cooling water flow path on the outer periphery of the cylinder; A water jacket spacer that is attached to a cylinder block having a semi-open deck structure having a side surface that forms an inner wall surface and a bridge that connects the other side surface in the radial direction of the cylinder, the water jacket spacer comprising: A plate portion formed in a planar shape to be disposed between the other side surfaces, and a hook portion projecting and formed in a hook shape from the upper end portion of the plate portion to suspend the plate portion below the bridge. It is characterized by that.

The water jacket spacer of the present invention (Claim 2) is characterized in that a notch portion is formed by vertically notching the center portion in the width direction of the plate portion at the lower end portion of the plate portion.
In this case, it is preferable that the notch is fitted to a projecting portion projecting near the bottom surface of the water jacket.
Further, it is preferable that the flange portion is formed with a gap substantially the same as the thickness of the bridge in the cylinder axial direction between the upper end portion of the plate portion (claim 4).

Alternatively, it is preferable that the flange portion is formed with a gap larger than the thickness of the bridge in the cylinder axial direction between the upper end portion of the plate portion (Claim 5).
In addition, this collar part has the latching | locking part formed in the planar shape which contacts the upper end surface of this bridge | bridging, and the extension part extended and formed further below this latching | locking part. (Claim 6).
The water jacket spacer mounting method of the present invention (Claim 7) includes a water jacket continuously provided along the circumferential direction of the cylinder as a cooling water flow path on the outer periphery of the cylinder, and an inner peripheral surface of the water jacket. A water jacket spacer mounting method for a cylinder block having a semi-open deck structure having a bridge connecting one side surface and the other side surface in the radial direction of the cylinder, the upper end of the plate portion formed in a planar shape A hook part is formed in a hook shape from the part, the hook part is locked to the upper surface of the bridge, and the plate part is suspended below the bridge.

  According to the water jacket spacer and the mounting method of the water jacket spacer of the present invention (Claims 1 and 7), the water jacket spacer can be attached below the bridge where it has been difficult to insert the water jacket spacer conventionally. The cooling performance of the engine can be improved, and the fuel efficiency of the engine can be improved.

  Moreover, attachment and removal of the water jacket spacer are easy, and productivity and maintainability can be improved. In addition, since the installation position of the bridge is not limited by the mounting position of the water jacket spacer, the rigidity of the cylinder block can be easily secured, and both the rigidity of the cylinder block and the assembling property of the water jacket spacer are compatible. Can do.

  Further, according to the water jacket spacer of the present invention (Claim 2), the sponge attached to the outer peripheral surface of the water jacket spacer is bent at the notch portion, so that the sponge can be easily removed along both sides of the plate portion. Can be fixed to. Further, the sponge can be prevented from being detached from the lower end portion of the water jacket spacer by attaching the sponge so as to pass through the inside of the notch of the notch portion at the lower end portion of the water jacket spacer.

Moreover, according to the water jacket spacer of the present invention (Claim 3), the lower end portion of the water jacket spacer can be fixed by fitting the notch portion and the projecting portion.
Further, according to the water jacket spacer of the present invention (Claim 4), the bridge can be sandwiched between the flange portion and the upper end portion of the plate portion, and the water jacket spacer can be easily fixed in the water jacket. it can.

According to the water jacket spacer of the present invention (claim 5), play can be provided in the vertical direction when the water jacket spacer is attached. Thereby, for example, it becomes easy to fit and fix the notch to the projecting portion formed in the lower portion of the bridge.
Moreover, according to the water jacket spacer of the present invention (Claim 6), since the extending part is formed in the collar part, the movement of the collar part in the horizontal direction can be restricted. Thereby, the water jacket spacer can be fixed more firmly.

  Hereinafter, an embodiment of the present invention will be described with reference to the drawings. 1 to 6 show a water jacket spacer as an embodiment of the present invention, FIG. 1 is a perspective view showing the spacer, FIG. 2 is a diagram showing a configuration of the spacer, and FIG. Is a top view thereof, (b) is a front view thereof, (c) and (d) are cross-sectional views thereof (a cross-sectional view taken along lines AA and BB in (a) and (b)), and FIG. FIG. 4 is a cross-sectional view of a cylinder block to which the spacer is attached, FIG. 5 is a perspective view illustrating a state in which the spacer is attached to the water jacket, and FIG. 6 is an enlarged cross-sectional view (a cross-sectional view taken along the line CC in FIG. 4) of the upper end portion of the spacer.

[Constitution]
(1) Overall Configuration The water jacket spacer 1 according to the present invention is applied to a water-cooled engine 20 shown in FIG. The engine 20 includes a cylinder block 6 and a cylinder head 13 that is attached adjacent to the cylinder block 6. A gasket 10 for securing airtightness is sandwiched between the joint surfaces of the cylinder block 6 and the cylinder head 13. A crankcase (both not shown) for supporting the crankshaft is provided on the lower side of the cylinder block 6.

  The cylinder head 13 is provided with an ignition plug, an intake valve interposed on the intake passage, and an exhaust valve interposed on the exhaust passage. On the other hand, the cylinder block 6 is provided with a piston on its inner peripheral surface. A cylinder bore (cylinder, hereinafter simply referred to as a cylinder) 7 in which 14 reciprocates is formed. The cylinder 7 is a hole formed in a substantially cylindrical shape, the outer periphery of which is surrounded by a cylinder liner (wall body forming the cylinder surface of the cylinder 7) 16. Inside the cylinder 7, its upper end and lower end are closed by a cylinder head 13 and a piston 14, respectively, to form a combustion chamber. In FIG. 4, the cylinder axis of the cylinder 7 is denoted by reference sign CL.

  In the cylinder block 6, a water jacket 8 is formed on the outer periphery of the cylinder 7 as a cooling water flow path for cooling the engine 20. Here, the water jacket 8 is adjacently extended in the direction of the cylindrical axis CL so as to surround the outer periphery of the cylinder liner 16, and has a shape capable of cooling substantially the entire outer periphery of the cylinder 7. That is, the water jacket 8 is formed as a cavity drilled as a cooling water passage adjacent to the cylinder 7 via the cylinder liner 16. The depth from the upper end surface of the cylinder block 6 is set to H as shown in FIG. The water jacket spacer 1 is inserted into the water jacket 8.

  FIG. 3 shows an exploded perspective view of the cylinder block 6 and the gasket 10. In the present embodiment, an in-line three-cylinder engine is applied as the engine 20, and therefore the cylinder block 6 has a structure in which three cylinders 7 are arranged in series. The water jacket 8 formed along the outer peripheral portion of each cylinder 7 is integrally connected along the circumferential direction of the cylinder. Further, a bridge 9 is formed at the upper end of the water jacket 8 to connect and reinforce the cylinder liner (one side surface) 16 and the cylinder block outer wall (other side surface) 17 forming the inner wall surface in the radial direction of the cylinder 7. ing. That is, the cylinder block 6 is formed as a semi-open deck in which the upper end portion of the water jacket 8 is partially connected by the bridge 9.

As shown in FIG. 3, the bridge 9 is formed so that the upper end surface thereof is smooth and the same plane as the upper end surface of the water jacket 8, and the thickness (thickness in the cylinder axial direction) is above the water jacket 8. D ₄ is directed vertically downward from the end face.
The positions of the bridges 9 in the top view of the cylinder block 6 are the vicinity where the imaginary line L (see FIG. 3) connecting the cylindrical axes CL of the cylinders 7 and the water jacket 8 intersect, and the cylindrical axes of the cylinders 7. A virtual line M (see FIG. 3) perpendicular to the virtual line L from CL and the water jacket 8 are in the vicinity.

As described above, the gasket 10 is a plate-like member that absorbs and seals (seal) slight irregularities and assembly errors on the joint surface between the cylinder block 6 and the cylinder head 13. As shown in FIG. 3, the thickness of the gasket 10 is d ₃ . Further, the gasket 10 has a pothole 10a, a cylinder hole 10b, a water hole 10c, and a bolt so as to correspond to the arrangement positions of the bridge 9, the cylinder 7, the water jacket 8 and the bolt hole 11 formed in the cylinder block 6. A hole 10d is formed.

(2) Water Jacket Spacer Configuration As shown in FIG. 1 and FIGS. 2A to 2C, the present water jacket spacer 1 includes a skeleton part composed of a plate part 2 and a collar part 3, and a sponge 12. Composed.
The plate portion 2 is a member formed in a curved shape along the inner wall surface of the water jacket 8 (the cylinder liner 16 and the cylinder block outer wall 17). As shown in FIG. 2 (a), it is bent in an arc shape when viewed from above, and has a curvature having a gap (not in contact) with the inner wall surface when inserted into the water jacket 8. ing. Moreover, as shown in FIG.2 (b), it is formed in the substantially rectangular shape in front view. The plate portion 2 is made of a material having thermal conductivity, and is made of, for example, metal or thermal conductive ceramics.

At the upper end portion of the plate portion 2, a flange portion 3 protruding in a hook shape is formed. As shown in FIG. 2 (b), the flange 3 protrudes vertically upward from the plate portion 2 and extends in the horizontal direction so as to have a predetermined gap d ₂ with respect to the upper end side of the plate portion 2. This is a portion having a U-shaped shape. Hereinafter referred to as site forming the upper side of the gap d ₂ of the hook portion 3 and the engaging portion 3a.
As shown in FIG. 2 (c), the thickness of the engaging portion 3a to the upper end side of the hook portion 3 is set to d _1, the protrusion length from the top edge of the plate portion 2 hook portion 3 to the whole of the upper Is d ₁ + d ₂ . In this embodiment, the thickness d ₁ is set to be approximately the same as the thickness d _{3 of the} gasket 10, and the gap d ₂ is set to be approximately the same as the thickness d _{4 of the} bridge 9. .

On the other hand, a notch portion 5 is formed at the lower end portion of the plate portion 2 by notching the center portion in the width direction of the plate portion 2 in the vertically upward direction. As shown in FIG. 2 (b), the notch 5 is a part formed by cutting out the vicinity of the center while leaving the left and right ends of the lower end side of the plate part 2.
The height from the lower end side of the plate portion 2 to the locking portion 3a is h _{1 as} shown in FIG. 2B, and h ₁ is shorter than the depth H of the water jacket 8 described above. Is set.

  Further, claws 4 for attaching the rectifying sponge 12 are attached to both plate surfaces of the plate portion 2. As shown in FIG. 2 (d), the claw 4 is a member that is erected substantially perpendicular to the plate surface and has a predetermined gap with respect to the plate surface so that its tip is bent downward. is there. The rectifying sponge 12 is a porous material inserted in order to suppress the flow rate and flow rate of the cooling water inside the water jacket 8.

  FIG. 1 shows a state in which a plate-like sponge 12 attached to one plate surface is bent inside the notch 5 and wound around the other plate surface in a U-shape. The upper end portions of both plate surfaces of the sponge 12 are locked by the caulked claws 4.

[Action]
The water jacket spacer 1 is configured as described above, and is attached to the cylinder block 6 as follows.
First, the above-described water jacket spacer 1 is prepared in which the flange portion 3 protruding in a hook shape is formed on the upper end portion of the plate portion 2 formed in a curved shape along the inner wall surface of the water jacket 8. A notch portion 5 is formed at the lower end portion of the plate portion 2, and the sponge 12 is bent inside the notch portion 5 of the water jacket spacer 1 and attached to both plate surfaces of the water jacket spacer 1. The upper end of the sponge 12 is fixed by caulking the claw 4.

  Subsequently, the water jacket spacer 1 is inserted into the water jacket 8 from above the cylinder block 6. At this time, the insertion position of the water jacket spacer 1 is a position where the bridge 9 is not stretched. Further, as shown in FIG. 5, the water jacket spacer 1 is slid horizontally in the circumferential direction of the cylinder 7 (in the direction of arrow D in FIG. 5) and moved so as to be positioned below the bridge 9.

At this time, the gap d ₂ between the hook portion 3 and the plate portion 2, since it is set to the thickness d ₄ and substantially the same size of the bridge 9, in contact with the engaging portion 3a on the upper surface of the bridge 9, and , will be the upper end sides of the plate portion 2 is brought into contact with the lower surface of the bridge 9, the bridge 9 is sandwiched into the gap d _2. Thereby, the collar portion 3 is locked to the upper surface of the bridge 9 and the water jacket spacer 1 is mounted in a state of being suspended below the bridge 9.

Further, since the height h ₁ from the lower end side of the plate portion 2 to the locking portion 3a is shorter than the depth H of the water jacket 8, a gap is formed in the lower portion of the water jacket spacer 1 as shown in FIG. Is done.
When the attachment of the water jacket spacer 1 is completed, the gasket 10 is laid on the upper surface of the cylinder block 6 and the cylinder head 13 is attached from above and fixed with bolts. At this time, as shown in FIG. 6, the thickness d ₁ from the locking portion 3 a of the water jacket spacer 1 to the upper end side of the flange 3 is set to be approximately the same as the thickness d _{3 of the} gasket 10. The cylinder head 13 is fixed to the upper part of the cylinder block 6 without interfering with the flange 3.

[effect]
Thus, according to the present water jacket spacer 1, the water jacket spacer 1 can be attached to the lower side of the bridge 9 where it has been difficult to insert the water jacket spacer 1 in the related art. Thereby, the cooling performance of the water jacket 8 can be improved, and the fuel consumption of the engine 20 can be improved. Further, the water jacket spacer 1 can be easily attached and detached by sliding in the horizontal direction, and the productivity and maintainability of the engine 20 can be improved.

  In this embodiment, an example in which the water jacket spacer 1 is attached below the bridge 9 is illustrated. However, when the water jacket spacer 1 is attached below the portion without the bridge 9, a known technique is used. Good. That is, according to the present invention, the mounting position of the water jacket spacer 1 is not limited by the position where the bridge 9 is disposed.

For example, it is not necessary to match the installation position of the bridge 9 required from the rigidity of the cylinder block 6 and the mounting position of the water jacket spacer 1, so that the degree of freedom in design can be increased and the cylinder block 6 can be easily used. The rigidity of the water jacket spacer 1 and the assembling property of the water jacket spacer 1 can be made compatible.
Further, since the flange portion 3 has a gap d ₂ substantially the same as the thickness d _{4 of the} bridge 9 between the upper end side of the plate portion 2, the bridge 9 can be sandwiched in the gap d _2, and it is easy. The water jacket spacer 1 as a whole can be fixed.

  Further, since the sponge 12 attached to the water jacket spacer 1 is bent inside the notch portion 5, the sponge 12 can be easily attached along both sides of the plate portion. Further, by attaching the sponge 12 so as to pass through the inside of the cutout portion 5 at the lower end portion of the water jacket spacer 1, the detachment of the sponge 12 from the lower end portion of the water jacket spacer 1 can be prevented.

Further, as shown in FIG. 4, at the lower part of the water jacket spacer 1, the difference between the depth H of the water jacket 8 and the height h ₁ from the lower end side of the plate portion 2 to the locking portion 3 a is obtained. Since the gap is formed, the flow of the cooling water can be improved near the bottom inside the water jacket 8.

[First Modification]
Although one embodiment of the present invention has been described above, the present invention is not limited to such an embodiment, and various modifications can be made without departing from the spirit of the present invention.
In the above-described embodiment, the gap d _{2 of the} flange portion 3 with respect to the upper end side of the plate portion 2 is set to be substantially the same as the thickness d _{4 of the} bridge 9, but the gap d ₂ is larger than the thickness d _4. It may be set. For example, as shown in FIG. 7A, when the gap d ₂ is formed to be larger than the thickness d ₄ by d ₅ , when the water jacket spacer 1 is attached below the bridge 9, the play of d ₅ is caused in the vertical direction. As a result, it is easier to install.

In such a configuration, since the bridge 9 does not contact the upper end side of the plate portion 2, the locking portion 3 a is simply locked to the upper surface of the bridge 9, so that the gap 9 between the bridge 9 and the gap d ₂ is reached. It is not fixed by pinching.
Therefore, in order to fix the entire water jacket spacer 1, it is conceivable to provide a projecting portion 15 that fits into the recess of the notch portion 5 on the bottom surface of the water jacket 8. For example, as shown in FIG. 7B, a protrusion having a width substantially the same as the width of the notch 5 is formed in the bottom surface of the water jacket 8 below the bridge 9 and at a position corresponding to the mounting position of the water jacket spacer 1. The installation portion 15 is formed to project.

In this case, if the fitting height between the notch portion 5 and the projecting portion 15 is smaller than the play d ₅ , the water jacket spacer 1 can be attached or detached. When the water jacket spacer 1 is installed in the water jacket 8, the water jacket spacer 1 is slid horizontally in a state where the lower surface of the bridge 9 is in contact with the upper end side of the plate portion 2, and then the entire water jacket spacer 1 is moved. Is moved downward.

  Thereby, the collar part 3 can be latched to the upper surface of the bridge 9, and the water jacket spacer 1 can be suspended below the bridge 9. At the same time, since the cutout portion 5 and the projecting portion 15 are fitted, the entire water jacket spacer 1 can be fixed.

[Second Modification]
For example, as shown in FIG. 8, it is also conceivable to provide an extension 3b that extends further downward than the locking portion 3a at the tip of the collar 3. In this case, the movement of the locking portion 3a locked to the upper surface of the bridge 9 in the direction E (the plate surface direction of the water jacket spacer 1) in the figure is restrained by the extending portion 3b. And the water jacket spacer 1 can be fixed.
In this case, the gap d ₆ between the lower end of the extending portion 3 b and the upper end side of the plate portion 2 only needs to be larger than the thickness d _{4 of the} bridge 9.

[Third Modification]
In the above-described embodiment, the thickness d _{1 of the} flange 3 is set to be approximately the same as the thickness d _{3 of the} gasket 10. For example, the thickness d _{1 of the} flange 3 cannot be reduced as much as the thickness d _3. In such a case, the thickness d _{1 of the} flange 3 may be set larger than the thickness d _{3 of the} gasket 10. In this case, for example, as shown in FIG. 9, if a recess 13 a that is recessed upward from the bottom surface of the cylinder head 13 is formed at a position facing the flange 3 of the cylinder head 13, the flange 3 and the cylinder head 13 can be avoided.
The indentation height d ₇ of the recess 13 a may be set larger than the difference between the thickness d _{1 of} the flange ₃ and the thickness d _{3 of the} gasket 10.

[Fourth Modification]
For example, as shown in FIG. 10, it is conceivable that at least the upper surface portion of the bridge 9 to which the flange portion 3 is locked is recessed below the upper end surface of the cylinder block 6. That is, by denting the upper surface of the bridge 9, the upper end of the flange 3 can be positioned below the upper end of the gasket 10, and the flange 3 and the cylinder head 13 are not processed on the cylinder head 13 side. Can be prevented.

In this case, only the part which contacts the latching | locking part 3a among the upper surfaces of the bridge | bridging 9 may be dented, and the formation height of the bridge 9 whole may be lowered | hung. The height d ₈ of recessing the top surface of the bridge 9, or lower may be set larger than the thickness of the difference between the thickness d ₃ of the thickness d ₁ and the gasket 10 of the hook portion 3.
Note that the thickness d _{1 of the} flange 3 can be set smaller than the thickness d _{3 of the} gasket 10, contrary to the third and fourth modifications. Also in this case, it goes without saying that interference between the flange 3 and the cylinder head 13 can be avoided.

[Others]
In the above-described embodiment, the water jacket spacer 1 bent in an arc shape and attached with the sponge 12 is illustrated, but the specific shape of the plate portion 2 is not limited to this. That is, any shape is applicable as long as it is a planar shape that can be disposed between the cylinder liner 16 and the cylinder block outer wall 17 of the cylinder block 6.

  Similarly, the claw 4 and the notch 5 are not essential components, and may be appropriately applied depending on, for example, the attachment method or attachment shape of the sponge 12.

It is a perspective view which shows the water jacket spacer as one Embodiment of this invention. It is a figure which shows the frame | skeleton part of the water jacket spacer of FIG. 1, (a) is the top view, (b) is the front view, (c) is AA sectional drawing in (a), (b), d) is a BB cross-sectional view in (a) and (b). It is a perspective view which shows the structure of the cylinder block of a semi-open deck to which the water jacket spacer of FIG. 1 is attached. It is sectional drawing of the cylinder block to which the water jacket spacer of FIG. 1 is attached. It is a perspective view which shows the attachment state in the water jacket of the water jacket spacer of FIG. FIG. 5 is an enlarged cross-sectional view (CC cross-sectional view of FIG. 4) showing an upper end portion of the water jacket spacer of FIG. 1. It is a figure which shows the water jacket spacer as a 1st modification of this invention, (a) is sectional drawing which expands and shows the upper end part, (b) is the side view. It is sectional drawing which expands and shows the upper end part of the water jacket spacer as a 2nd modification of this invention. It is sectional drawing which expands and shows the upper end part of the water jacket spacer as a 3rd modification of this invention. It is sectional drawing which expands and shows the upper end part of the water jacket spacer as a 4th modification of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Water jacket spacer 2 Plate part 3 Gutter part 3a Locking part 3b Extension part 4 Claw 5 Notch part 6 Cylinder block 7 Cylinder 8 Water jacket 9 Bridge 10 Gasket 10a Bore hole 10b Cylinder hole 10c Water hole 10d Bolt hole 11 Bolt Hole 12 Sponge 13 Cylinder head 13a Concave portion 14 Piston 15 Convex portion 16 Cylinder liner 17 Cylinder block outer wall 20 Engine

Claims (7)

A water jacket continuously provided along the circumferential direction of the cylinder as a cooling water flow path on the outer periphery of the cylinder, and a bridge that connects the one side surface and the other side surface forming the inner wall surface of the water jacket in the radial direction of the cylinder A water jacket spacer attached to a cylinder block having a semi-open deck structure,
A plate portion formed in a planar shape to be disposed between the one side surface and the other side surface of the water jacket;
A water jacket spacer, comprising: a flange portion projecting from the upper end portion of the plate portion so as to suspend the plate portion below the bridge. The water jacket spacer according to claim 1, further comprising: a notch portion in which a central portion in the width direction of the plate portion is cut vertically upward at a lower end portion of the plate portion. The water jacket spacer according to claim 2, wherein the notch is fitted with a projecting portion projecting near the bottom surface of the water jacket. The flange portion is formed with a gap substantially the same as the thickness in the cylinder axial direction of the bridge between the upper end portion of the plate portion and the flange portion. The water jacket spacer according to item 1. The flange portion is formed with a gap larger than the thickness in the cylinder axial direction of the bridge between the upper end portion of the plate portion and the flange portion. Water jacket spacer according to item. The flange portion has a locking portion formed in a planar shape that comes into contact with the upper end surface of the bridge, and an extending portion that extends further downward than the locking portion. The water jacket spacer according to any one of claims 1 to 5. A water jacket continuously provided along the circumferential direction of the cylinder as a cooling water flow path on the outer circumference of the cylinder, and one side surface and the other side surface forming the inner circumferential surface of the water jacket are coupled in the radial direction of the cylinder. A method for attaching a water jacket spacer to a cylinder block having a semi-open deck structure having a bridge,
From the upper end of the plate portion formed in a planar shape, a collar portion is formed in a bowl shape,
A method for mounting a water jacket spacer, wherein the hook portion is locked to the upper surface of the bridge, and the plate portion is suspended below the bridge.

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