JP5227373B2 - Spacer - Google Patents

Description

  The present invention relates to a spacer inserted into a water jacket for cooling an internal combustion engine such as a vehicle engine.

  Conventionally, for example, in a cylinder block and a cylinder head constituting a water-cooled multi-cylinder internal combustion engine, a water jacket having a hollow inside is formed, and by circulating cooling water in the water jacket, A predetermined portion of the cylinder block and the cylinder head around the spark plug is appropriately cooled.

  For example, in Patent Document 1, a spacer that is inserted into a water jacket formed around a cylinder bore and that is held by a clamp mechanism of an automatic assembling machine can be configured integrally with the spacer. It is disclosed. The clamp seats are disposed so as to face each other on the inner peripheral side of the spacer in the inter-cylinder region, and are provided so as to protrude toward the cylinder bore side.

Japanese Patent No. 3974890

  However, the clamp seat disclosed in Patent Document 1 is provided to be held by the clamp mechanism of the automatic assembly machine when the spacer is inserted into the water jacket of the cylinder block. It is not envisaged that any other spacers can be used to pull the spacers out of the water jacket.

  Further, in Patent Document 1, for example, there is no space around the clamp seat of the spacer inserted in the water jacket in which a tool or an operator's finger or the like can be inserted. If the spacer is forcibly pulled out by being hooked on the clamp seat, the spacer may be deformed or damaged.

  The present invention has been made in view of the above points, and an object of the present invention is to provide a spacer that can be pulled out smoothly without deforming the spacer inserted into the water jacket.

In order to achieve the above object, the present invention provides a spacer inserted into a water jacket formed around a cylinder bore of an internal combustion engine, wherein the spacer abuts against an inner wall of the water jacket. A first hook portion that is locked by a pulling means when the spacer is pulled out from the water jacket is provided on the opening side of the water jacket in the cylinder bore axis direction of the contact member . The first catch portion is formed along a circumferential direction of the cylinder bore, and the spacer has an extension portion extending to the vicinity of the opening portion of the water jacket in the cylinder bore axial direction with respect to the contact member, One catching part is provided in the extension part, and the spacer is arranged around the entire circumference of the cylinder bore. Having a spacer body which Nyo, the extending portion is characterized rolled Mashimasu Rukoto on the opening side of the cylinder bore axial direction of the water jacket than the spacer body.

According to the present invention, the spacer inserted in the water jacket can be easily pulled out by locking the first hook portion provided on the spacer with the pulling means . When the spacer is pulled out from within the water jacket, the first catching portion is provided at a position along the cylinder bore axial direction of the contact member, so that the contact member is in contact with the spacer while maintaining the state in contact with the spacer. The spacer can be pulled out from the substrate, and deformation of the spacer can be preferably avoided.

  Further, according to the present invention, the first catching portion provided in the spacer is formed along the circumferential direction of the cylinder bore, so that it extends in the same or substantially the same direction as the flow direction of the cooling water. It can be configured so as not to obstruct the flow.

Furthermore, according to the present invention, the first hooking portion is provided in the extending portion that extends to the vicinity of the opening portion of the water jacket in the cylinder bore axis direction with respect to the contact member, so that the inner portion of the water jacket is reached. The first hook portion can be easily locked without inserting the pulling means .

Furthermore, according to the present invention, the spacer main body surrounding the entire circumference of the cylinder bore is provided, and the extending portion is provided so as to extend to the opening side of the water jacket in the cylinder bore axial direction from the spacer main body. Accordingly, in the present invention, the first hooking portion can be positioned closer to the water jacket opening than the spacer main body, and the first hooking portion can be easily locked without hindering the spacer main body.

Further, the present invention, prior Symbol spacer, the thick portion formed in the wall thickness as compared to the general portion which surrounds the periphery is provided in the cylinder bore, the opening of the water jacket in the cylinder bore axial direction of the thick portion The part side is provided with a second catching part. Furthermore, the present invention is characterized in that an upper end of the first catch portion is positioned below an upper surface of the cylinder block in a state where the spacer is inserted into the water jacket.

  According to the present invention, the second hook portion is provided on the opening side of the water jacket along the cylinder bore axis direction of the thick portion of the thick portion that is formed relatively thick with respect to the general portion, and the second hook By locking the portion, the spacer inserted in the water jacket can be pulled out smoothly without being deformed.

  Furthermore, the present invention is a spacer inserted into a water jacket formed around a cylinder bore of an internal combustion engine, and has a contact member that contacts the inner wall of the water jacket, and the cylinder bore axis of the contact member A first catch portion provided on the opening side of the water jacket in the direction, and a thick portion formed thicker than a general portion surrounding the periphery of the cylinder bore, the cylinder bore axis of the thick portion And a second catch portion provided on the opening side of the water jacket in the direction.

  According to the present invention, the spacer can be pulled out more smoothly and easily by providing both the first hook portion and the second hook portion and by cooperating the first hook portion and the second hook portion. it can.

  According to the present invention, it is possible to obtain a spacer that can be pulled out smoothly without deforming the spacer inserted into the water jacket.

1 is a schematic perspective view of an engine in which a spacer according to an embodiment of the present invention is incorporated. It is a disassembled perspective view of the cylinder block and spacer which comprise the said engine. (A) is the perspective view of the spacer shown by FIG. 1, (b) is the perspective view seen from the arrow Z side of (a). It is a top view of the cylinder block shown by FIG. It is a longitudinal cross-sectional view along the AA line of FIG. It is a permeation | transmission side view of the spacer inserted in the water jacket of a cylinder block. (A) is an enlarged plan view of the protrusion provided on the inner periphery of the spacer according to the present embodiment, and (b) is an enlarged plan view of the convex portion provided on the inner periphery of the spacer according to the comparative example. It is a perspective view of the spacer which concerns on the modification of this embodiment. (A) is a perspective view of the elastic body, (b) is a partially broken enlarged perspective view showing a state in which the elastic body is mounted in the long groove of the spacer body, and (c) is a GG line of (b). FIG. It is a longitudinal cross-sectional view along the BB line of FIG. (A) is the C section enlarged view of FIG. 4, (b) is an expansion perspective view of the protrusion provided in the inner periphery of the spacer main body. It is a longitudinal cross-sectional view along the EE line of Fig.11 (a). It is a longitudinal cross-sectional view along the DD line of FIG. It is explanatory drawing which showed the process in which the molten resin material inject | poured in the cavity of a shaping die is solidified, and a spacer is manufactured. (A) is explanatory drawing which shows the state which pulls out a spacer from a water jacket using a tool, (b) and (c) are the longitudinal cross-sectional views along the FF line of (a) in the state which pulls out a spacer. is there. It is a partially broken expanded perspective view which shows the taper surface formed in the inner side wall of a water jacket.

  Next, embodiments of the present invention will be described in detail with reference to the drawings as appropriate. FIG. 1 is a schematic perspective view of an engine in which a spacer according to an embodiment of the present invention is incorporated, FIG. 2 is an exploded perspective view of a cylinder block and a spacer constituting the engine, and FIG. FIG. 3B is a perspective view of the spacer shown, FIG. 3B is a perspective view seen from the arrow Z side of FIG. 3A, and FIG. 4 is a plan view of the cylinder block shown in FIG.

  As shown in FIG. 1, an engine (internal combustion engine) 12 in which a spacer 10 according to an embodiment of the present invention is incorporated is arranged along a cylinder row direction (cylinder bore row direction, see a one-dot chain line T1 in FIG. 1). An in-line four-cylinder engine in which two cylinders (cylinder bores) are linearly arranged is installed in an engine room of a vehicle (not shown). The engine 12 includes, for example, a cylinder block 14 made of an aluminum alloy, a cylinder head 16 made of, for example, an aluminum alloy, and a head cover (not shown) mounted on the cylinder head 16. It is comprised by.

  In the present embodiment, an in-line four-cylinder engine will be described below as an example of an engine in which the spacer 10 is incorporated. However, the present invention is not limited to this. For example, a plurality of cylinders are arranged along the V bank. The present invention is applicable to a V-type multi-cylinder engine, a horizontally opposed engine, etc., and the number of cylinders such as a single cylinder or a plurality of cylinders is not limited. In the case of a single cylinder engine, an alternate long and short dash line T1 in FIG. 1 indicates a direction parallel to the crankshaft.

  In the following description, the vertical direction refers to the axial direction of the cylinder bore (see the alternate long and short dash line T2 in FIG. 1), and the cylinder head 16 side will be described as the upper side. The inner direction refers to a direction approaching a one-dot chain line T2 indicating the axial direction of the cylinder bore, and the outer direction refers to a direction away from the one-dot chain line T2. Further, the circumferential direction refers to a direction surrounding the one-dot chain line T2 or the cylinder bore. Furthermore, a direction orthogonal to both the cylinder row direction (T1) and the cylinder bore axial direction (T2) is referred to as a bore orthogonal direction (see a one-dot chain line T3 in FIG. 1).

  Inside the cylinder block 14 and the cylinder head 16 are provided water jackets 18 through which cooling water flows (the water jacket on the cylinder head 16 side is not shown). Further, on one end side in the cylinder row direction of the cylinder block 14, a cooling water inlet 20a for supplying cooling water fed from a radiator (not shown) into a water jacket 18 via a water pump (not shown), After the cooling water introduced from the cooling water inlet 20a circulates through the plurality of cylinders along the water jacket 18, there are provided a plurality of cooling water outlets 20b for leading the cooling water to a water jacket (not shown) on the cylinder head 16 side. . The plurality of cooling water outlets 20b are configured by holes formed in a gasket 70 described later (see FIG. 2).

  As shown in FIG. 4 (see also FIG. 2), the water jacket 18 of the cylinder block 14 is continuous so as to surround substantially the outer periphery of the four cylinder bores along the cylinder row direction in plan view. And it forms so that it may go around. In the vertical direction of the cylinder block 14, the upper end portion of the water jacket 18 is formed to be open, and the lower end portion (bottom wall) of the water jacket 18 is formed to be closed inside the cylinder block 14. Is done.

  FIG. 5 is a longitudinal sectional view taken along line AA of FIG. In this case, as shown in FIG. 5, the water jacket 18 has an opening 18 a at the upper end surface of the cylinder block 14, and an inner side wall formed at a predetermined interval inside the cylinder block 14 and facing each other. (A cylinder bore side inner wall) 18b and an outer side wall (outer wall located on the outer wall side of the cylinder block) 18c, and a space formed by a bottom wall 18d connecting the inner side wall 18b and the outer side wall 18c on the lower side. Composed.

  Further, the water jacket 18 is spaced apart from the inner side wall 18b and the outer side wall 18c of the cylinder block 14 from the upper end surface to the lower end surface (bottom surface) of the cylinder block 14 in a longitudinal section along the vertical direction of the cylinder block 14. D (see FIG. 5) is formed in a tapered shape that gradually becomes narrower and tapers. In other words, the water jacket 18 is formed to gradually taper from the opening 18a of the cylinder block 14 to the bottom wall 18d in the depth direction.

  A cylinder liner 22 made of a thin cylindrical body is attached to the cylinder bore to constitute a bore wall. Further, a gasket 70 (see FIG. 2) is interposed between the cylinder block 14 and the cylinder head 16, and the upper end surface of the cylinder block 14 is sealed by the gasket 70.

  A resin spacer 10 is inserted into the water jacket 18 of the cylinder block 14, and a flow path for circulating cooling water is formed between the spacer 10, each wall surface of the water jacket 18 and the gasket 70. The In the water jacket 18, this flow path includes an upper flow path 24a and a lower flow path 24b that function as main flow paths for circulating a large amount or most of the cooling water, the upper flow path 24a, An intermediate channel 24c that is formed between the lower channel 24b and functions as a sub-channel (see FIGS. 5, 10, 12, and 13 to be described later). In the present embodiment, the resin spacer 10 manufactured by injection molding using a molding die to be described later is illustrated. However, for example, a metal spacer formed by casting or blow molding is used. It may be used.

  As shown in FIG. 3 or FIG. 4, the spacer 10 is formed of a cylindrical body in which four belt-like rings are continuously and integrally joined in a plan view and close to each other inward. The spacer main body 10a having the constricted constricted portion 25 and a pair of elastic bodies (contact members) 28 attached to the long grooves 26 (see FIG. 2) at both ends of the spacer main body 10a along the cylinder row direction. With. In addition, the thickness dimension of the spacer main body 10a is set to substantially the same dimension that is slightly smaller than, for example, the width dimension of the water jacket 18 (the separation distance D along the horizontal direction of the inner side wall 18b and the outer side wall 18c). However, what is necessary is just to have the thickness dimension arrange | positioned adjacent to the inner side wall 18b by the side of a cylinder bore at least.

  An extension portion 30 extending upward is provided at one end portion along the cylinder row direction on the upper surface 11 of the spacer body 10a, and the extension portion 30 is provided at the other end portion along the cylinder row direction. A first catching portion 32 facing the protruding portion 30 is provided extending in the upward direction. On the upper surface 11 of the spacer main body 10a close to the extending portion 30, a second hooking portion 34 extending upward is provided. In addition, the said extension part 30, the 1st hook part 32, and the 2nd hook part 34 are each set to the same height dimension (refer FIG. 6).

  On the lower surface of the spacer body 10a, a pair of leg portions 36a and 36b extending downward from the extension portion 30 and the first hook portion 32 and facing each other in the cylinder row direction, and a second hook portion 34 are provided. The other leg part 36c provided in the downward direction along the up-down direction of this and extended toward the downward side is provided. The pair of leg portions 36a and 36b are provided so as to be branched in the circumferential direction, and a slit 38 extending in a rectangular shape along the vertical direction is formed between the branched one leg portion and the other leg portion. . A horizontally long rectangular window 40 is formed through the slit 38, and a locking portion 28d of an elastic body 28 to be described later is locked in the window 40.

  In the inner periphery of the spacer main body 10a corresponding to the constricted portion 25 and in the vicinity of the upper surface, it protrudes toward the inner side wall 18b of the water jacket 18, and is substantially rectangular in shape as seen through from the side as shown in FIG. A plurality of protrusions 42 exhibiting the above are provided opposite to each other at an inter-cylinder site that is a connection site between adjacent cylinder bores.

  Each protrusion 42 has the same shape, and as shown in FIGS. 7A and 11, a gate remaining portion 42a (material introduction portion) formed at a substantially central portion of the protrusion 42 as a gate trace described later. The protrusions 42b and 42b are provided at the corners on both sides of the projection 42 along the cylinder row direction with the gate remaining portion 42a in between, and are in contact with the inner side wall 18b of the water jacket 18.

  As shown in FIG. 11B, the overhang portions 42b and 42b are provided at both side corners of the protrusion 42 along the cylinder row direction (T1) and along the axial direction (T2) of the cylinder bore. It is provided so as to extend in the vertical direction. These overhang portions 42b and 42b are in point contact with the inner side wall 18b of the water jacket 18 when viewed in plan as shown in FIG. 7 (a), and in the EE cross section shown in FIG. When the portions 42 b and 42 b come close to and come into contact with the inner side wall 18 b of the water jacket 18, they are provided so as to be in line contact with the inner side wall 18 b of the water jacket 18.

  In this way, the overhang portions 42b and 42b come into contact with the inner side wall 18b of the water jacket 18 to suppress backlash in the bore orthogonal direction (T3) of the spacer 10, and in addition to the cylinder row direction (T1) of the spacer 10. ) Can be suppressed. FIG. 7B shows a spacer 200 according to a comparative example in which the convex portion remaining in the gate remaining portion 42 a is in contact with the inner side wall 18 b of the water jacket 18.

  The gate remaining part 42a is removed by polishing / grinding after molding as will be described later. However, when it is mass-produced, the gate remaining part 42a has a dimensional accuracy that projects to the inner side wall 18b (the projecting dimension is constant). Is complicated or difficult. Therefore, compared with the comparative example in which the convex portion of the gate remaining portion 42a is brought into contact with the inner side wall 18b of the water jacket 18, in this embodiment, the gate remaining portion 42a is not brought into contact with the gate remaining portion 42a. The spacers 10 can be supported with high accuracy by bringing the overhang portions 42b, 42b provided at the corners on both sides into contact with the inner side wall 18b of the water jacket 18.

  In addition, since the overhang portions 42b and 42b are set to contact the inner side wall 18b of the water jacket 18 before the gate remaining portion 42a, even if the gate remaining portion 42a slightly protrudes, the influence is exerted. It can be reduced or ignored.

  Furthermore, a plurality of (two) projecting portions 42b and 42b are provided along the cylinder row direction at both side corners of the projection 42 with the gate remaining portion 42a interposed therebetween, and a plurality of projections 42 (in the present embodiment). , 6 projections are illustrated) on opposite sides of the connecting portion between adjacent cylinder bores.

  In this case, the plurality of protrusions 42 (the overhang portions 42 b and 42 b) are not always in contact with the inner side wall 18 b, but the clearance (gap, separation) between the spacer 10 and the inner side wall 18 b of the water jacket 18. By narrowing the (interval) C by the protrusion 42, the rotation range of the spacer 10 is restricted to prevent transmission of piston hitting sound. That is, if the spacer 10 is freely movable in the water jacket 18, the spacer 10 comes into contact with both the inner side wall 18b and the outer side wall 18c of the water jacket 18 due to the flow of the cooling water, and piston impact sound (engine (Including vibration). For this reason, in this embodiment, the clearance C between the inner side wall 18b of the water jacket 18 and the spacer 10 is narrowed by the protrusion 42 provided on the inner side of the spacer main body 10a, and the clearance C is made as small as possible, thereby moving the spacer 10 in the moving range. This prevents the spacer 10 from coming into contact with the outer side wall 18c and prevents transmission of piston hitting sound.

  Furthermore, as will be described later, a pair of projecting portions 42b and 42b are formed by a flat surface that is linearly connected with a gate functioning as an inlet through which molten resin is injected therebetween (see FIG. 7A). ), See FIG. As a result, in the present embodiment, the surface between the pair of overhanging portions 42b and 42 is compared with, for example, a complicated shape having a depression, so that the gate extends to both overhanging portions 42a and 42b. Since the flow of the molten resin can be improved, the overhang portions 42b and 42b can be formed with high dimensional accuracy, and the regulation accuracy of the spacer 10 in the water jacket 18 can be improved.

  As shown in the spacer 10 according to the modification of FIG. 8, a plurality of protrusions are formed by attaching or bonding an elastic member 44 such as rubber to the constricted portion 25 on the outer peripheral surface of the spacer body 10 a. The elastic member 44 may abut on the outer side wall 18c of the water jacket 18. In this case, the elastic member 44 may be configured by a member that inhibits transmission of piston hitting sound. In FIG. 8, the pair of elastic bodies 28 and 28 provided at both ends along the cylinder row direction are depicted so as to come into contact with the inner side wall 18b. It is preferable that the protruding direction is reversed and the outer side wall 18c is abutted.

  A bulging portion 45 bulging toward the inner side wall 18b of the water jacket 18 is formed at both end portions along the cylinder row direction of the spacer body 10a. Hereinafter, since one and the other along the cylinder row direction have the same shape, only one shape is illustrated in FIGS. 9B and 9C, and description of the other shape is omitted. As shown in FIG. 9B, the bulging portion 45 is formed with a long groove 26 having a substantially T-shaped cross section along the horizontal direction and extending along the vertical direction. In the cross section shown in FIG. 9C, the long groove 26 has a vertically long opening 26a that opens toward the inner side wall 18b of the water jacket 18, and a pair of lateral sides that are continuous with the vertically long opening 26a therebetween. It is comprised from the groove part 26b.

  The lower end portion of the long groove 26 communicates with a slit 38 provided between the leg portions 36b, 36b that bifurcates, and the upper end portion of the long groove 26 is blocked at a portion that substantially coincides with the upper surface 11 of the spacer body 10a. Provided. In this case, as shown in FIG. 9B, the dimension (S1) in the width direction of the slit 38 is formed slightly larger than the width dimension (S2) of the elastic body 28 described later (S1> S2). ), By engaging the elastic body 28 from the lower side to the upper side of the slit 38, the elastic body 28 can be smoothly inserted into the long groove 26 communicating with the slit 38. As a result, the assembling property can be improved.

  The elastic body 28 is made of, for example, a rectangular body made of a rubber material, and extends along the central axis H on both sides of the central axis H as shown in FIGS. 9 (a) and 9 (c). The thin-walled thin-walled side portions 28a, 28a, the thick-walled thick-walled rectangular portion 28b provided between the thin-walled side portions 28a, 28a and extending along the central axis H, and the thick-walled rectangular portion 28b. A protrusion 28c that protrudes on the lower side, and a locking part 28d that is provided on the opposite side (back side) to the side where the protrusion 28c is provided and extends in a direction orthogonal to the central axis H. . The cross-sectional shape of the elastic body 28 is formed in a substantially T-shape that corresponds to the long groove 26 (corresponding to the shape of the long groove 26), as shown in FIG. 9C.

  The protruding portion 28c of the elastic body 28 has a top portion that protrudes outward from the thick rectangular portion 28b, and a linear ridge line portion 28e that contacts the inner side wall 18b of the water jacket 18 is provided. The contact condition (contact state) between the ridge line part 28e of the protrusion 28c and the inner side wall 18b of the water jacket 18 will be described later. The protrusion 28c is formed in a triangular prism shape (see FIG. 9C) and functions as a close contact portion. The inclination angle along the ridge line portion 28e of the protruding portion 28c is set to be different from the inclination angle in the longitudinal section of the inner side wall 18b of the water jacket 18 (the longitudinal section passing through the center of the cylinder bore). In other words, the ridge line in the ridge line part 28e of the protrusion part 28c is set in a cross shape that is not parallel to the vertical cross section of the inner side wall 18b of the water jacket 18 (the vertical cross section passing through the center of the cylinder bore).

  In this case, when the protrusion 28c of the elastic body 28 is mounted in the long groove 26 of the spacer body 10a, the protrusion 28c is exposed to the inner peripheral side through the vertically long opening 26a, and the inner side wall 18b constituting the water jacket 18 is exposed. Provided in contact.

  In addition, by setting the ridge line in the ridge line portion 28e of the protrusion 28c to be non-parallel to the longitudinal section of the inner side wall 18b of the water jacket 18, the degree of adhesion of the protrusion 28c to the inner side wall 18b of the water jacket 18 is set. Since the load gradually increases according to the insertion condition of the spacer 10, the insertability can be improved and the deformation of the elastic body 28 having the protrusion 28 c is prevented as much as possible. The influence on can be suppressed.

  For example, when the spacer 10 to which the elastic body 28 is mounted is inserted into the water jacket 18, the inner side wall 18 b and the protrusion 28 c of the elastic body 28 start to hit at the portion of the opening 18 a on the upper side of the water jacket 18. Is the point contact state, but as the spacer 10 is gradually inserted toward the lower side of the water jacket 18, the protrusion 28c of the elastic body 28 changes from the point contact state to the line contact state with respect to the inner side wall 18b. Eventually, the protrusion 28c of the elastic body 28 is elastically deformed to be in surface contact with the inner side wall 18b. Thus, the insertion load of the spacer 10 into the water jacket 18 does not increase from the beginning, and the contact load gradually increases in accordance with the insertion state of the spacer 10 toward the back of the water jacket 18. By providing, the load (sliding resistance) at the time of insertion of the spacer 10 can be reduced, favorable insertability can be obtained, and assemblability can be improved.

  Further, in the elastic body 28, the contact portion with the inner side wall 18b of the water jacket 18 is limited to the protrusion 28c supported by the thick rectangular portion 28b, and the ridge lines 28e to 28e formed on the top of the protrusion 28c. Since only the vicinity thereof is provided so as to be in contact with the inner side wall 18b of the water jacket 18 (point contact → line contact → surface contact), the deformation amount in the elastic body 28 itself can be suppressed to be small, and durability can be improved. .

  Furthermore, the spacer 10 is held and fixed at a predetermined position in the water jacket 18 by a pair of elastic bodies 28 and 28 respectively provided at both ends of the spacer body 10a along the cylinder row direction. For example, the spacer 10 is displaced from a predetermined position where the spacer 10 is previously installed due to the water pressure of the cooling water, the engine vibration, or the like, and temporarily, any one of the extending portion 30, the first catching portion 32, and the second catching portion 34 described later is the gasket 70. Even when abutting against the lower surface of the water jacket 18, the abutting load applied to the gasket 70 by the frictional resistance generated between the inner side wall 18b of the water jacket 18 and the elastic bodies 28, 28 can be suitably reduced. .

  The locking portion 28d provided on the back side of the projection 28c is elastically deformed when the elastic body 28 is assembled in the long groove 26 of the spacer body 10a, and the window portion 40 (see FIG. 2) formed in the spacer body 10a. ). In this way, the locking portion 28d of the elastic body 28 is locked to the window portion 40 of the spacer body 10a, so that the elastic body 28 inserted into the long groove 26 at the time of assembly is positioned at a predetermined position of the spacer body 10a. Is positioned.

  The elastic body 28 reverses the front and back to expose the protruding portion 28c on the outer peripheral side so that the protruding portion 28c makes point contact or line contact with the outer side wall 18c constituting the water jacket 18. May be. In this case, the window part 40 to which the locking part 28d is locked is provided inside the spacer body 10a.

  Returning to FIG. 3, the first hooking portion 32 protrudes from the upper surface 11 of the spacer body 10 a and is provided above the elastic body (contact member) 28 on the other end side along the cylinder row direction. The first hook portion 32 extends from the upper surface 11 and has a taper portion 32a whose width dimension gradually decreases as it goes upward, and a head that extends from the taper portion 32a and has its width dimension enlarged as it goes upward. It is comprised from the part 32b and the constriction part 32c provided between the said taper part 32a and the said head part 32b, and was formed narrowly. In this case, the first catching portion 32 is provided so as to extend along the axial direction (vertical direction) of the elastic body 28 and the cylinder bore functioning as a fixing portion. Moreover, the taper part 32a, the head part 32b, and the constriction part 32c along the cylinder bore axial direction of the elastic body 28 function as an extension part.

  As shown in FIG. 15, for example, by engaging a tool (for example, a member having an annular portion made of a wire or the like) with the constricted portion 32 c and hooking the annular portion on the head portion 32 b, The spacer 10 can be easily pulled out (drawn out) from the jacket 18.

  In this case, when the first hook 32 is locked with a tool or the like (not shown) and the spacer 10 is pulled out above the water jacket 18, the first hook 32 is the axis of the cylinder bore of the elastic body 28 (fixed portion). Since the elastic body 28 is positioned on the extension line of the force for pulling out the first hook 32, the elastic body 28 can be easily pulled out while avoiding deformation of the spacer 10 (see FIG. 15 (b), (c)).

  As shown in FIG. 6, the upper surface 11 of the spacer 10 is cooled from the location facing the cooling water inlet 20 a of the cylinder block 14 to the location facing the cooling water outlet 20 b, in other words, the cooling flowing along the water jacket 18. It is formed with an inclined surface that inclines at a constant gradient upward so as to gradually approach the opening 18a of the water jacket 18 of the cylinder block 14 from the upstream side to the downstream side of the water. By making the upper surface 11 of the spacer 10 to be an inclined surface having such a constant gradient in the upward direction, a force that presses the spacer 10 downward by the flow of cooling water from the upstream to the downstream of the water jacket 18 acts. In addition, the spacer 10 can be stabilized. On the other hand, the lower surface 13 of the spacer 10 is formed in a horizontal plane having a zero gradient from the upstream side to the downstream side of the cooling water flowing along the water jacket 18. In FIG. 6, for convenience, the upper surface 11 of the spacer 10 is shown as “the upper surface 11 a of the spacer 10” from the portion facing the cooling water inlet 20 a of the cylinder block 14 to the first hooking portion 32, and the first hooking portion 32. The portion up to the location facing the cooling water outlet 20b is shown as “the upper surface 11b of the spacer 10”.

  The first catch portion 32 provided in the spacer 10 is formed along the circumferential direction of the cylinder bore so as to extend in the same or substantially the same direction as the flow direction of the coolant so as not to hinder the flow of the coolant. It is configured. That is, when the hook is formed by causing the first hook portion 32 to protrude in the radial direction (thickness direction of the spacer 10), for example, like the second hook portion 34, the protruding portion in the radial direction is the cooling water. Acts to hinder the flow of water. For this reason, one head portion 32 b of the first hook portion 32 extends toward the upstream side of the water jacket 18, and the other head portion 32 b of the first hook portion 32 faces toward the downstream side of the water jacket 18. And is formed in a shape along the circumferential direction of the cylinder bore that does not obstruct the flow of cooling water as much as possible.

  In addition, the 1st catch part 32 is provided in the edge part (U-turn part of the cooling water mentioned later) where the flow speed of cooling water is comparatively slow in the edge part along a cylinder row direction. Therefore (see FIG. 1), it can be provided at a site that does not obstruct the flow of the cooling water as much as possible.

  Furthermore, since the first hook portion 32 is provided in a portion extending to the vicinity of the opening 18a of the water jacket 18 (see FIG. 6), for example, a tool or the like is not inserted to the back of the water jacket 18, The tool can be easily hooked to the constricted portion 32c (head portion 32b).

  Furthermore, the first hook 32 is provided closer to the opening 18a of the water jacket 18 than the spacer body 10a (see FIGS. 1 and 6), so that the spacer body 10a does not become an obstruction member and is constricted. The part 32c (head part 32b) can be easily locked.

  The extending portion 30 that protrudes upward from the upper surface 11 of the spacer body 10a and is formed on one end side along the cylinder row direction has a substantially rectangular shape, and is formed by chamfering corners. By providing the extending portion 30, even if the spacer 10 is displaced from a predetermined position in the water jacket 18 due to cooling water pressure or engine vibration, the extending portion 30 contacts the gasket 70. The displacement can be regulated in contact.

  The second catching portion 34 protrudes from the upper surface 11 of the spacer body 10a and is close to one end portion along the cylinder row direction, and is integrated with the spacer body 10a to partition the cooling water inlet 20a and the cooling water outlet 20b of the water jacket 18. Is provided above the partition part (thick part) 46 formed thick (see FIGS. 1 to 3). The second hook portion 34 has a substantially L-shaped longitudinal section, and protrudes from the upper end surface of the spacer body 10a, and a predetermined length from the upper end surface of the body portion 34a in a substantially horizontal direction. A protruding collar 34b is provided. The second catching portion 34 is formed above the partition portion 46 that is thick and rigid compared to a general portion that is relatively thin in the portion surrounding the cylinder bore in the spacer main body 10a. Provided.

  Since the second catching portion 34 is provided in a portion along the axial direction of the cylinder bore of the partition portion 46 that is formed thicker than the general portion and has rigidity, when the spacer 10 is pulled out by a tool or the like, It can be easily pulled out while suppressing deformation.

  In this case, by engaging a hand or a tool (for example, a member having an annular portion made of a wire or the like) with the flange portion 34b and hooking the annular portion onto the flange portion 34b, The spacer 10 can be easily pulled out (see FIG. 15A). A communication hole 48 (see FIG. 1) communicating with the cooling water inlet 20a of the water jacket 18 is opened in the vicinity of the collar 34b of the second catching section 34, and the collar 34b can be pulled out with a finger of a hand. Space is provided.

  The spacer 10 can be pulled out from the water jacket 18 by either the first hook portion 32 or the second hook portion 34 alone, but the first hook portion 32 and the second hook portion can be pulled out. It is preferable to pull out the part 34 substantially simultaneously. In other words, the first hook portion 32 and the second hook portion 34 provided above the spacer body 10a are provided on one end side and the other end side in the cylinder row direction, respectively, and pulling out the drawing load almost simultaneously is performed in the cylinder row. Since it can disperse | distribute and provide to the one end side and other end side of a direction, the deformation | transformation of the longitudinal direction of the spacer 10 can be suppressed further.

  The engine 12 in which the spacer 10 according to the present embodiment is incorporated is basically configured as described above. Next, the function and effect will be described.

  First, the manufacturing process of the spacer 10 will be described. FIG. 14 is an explanatory view showing a process in which the molten resin material injected into the cavity of the molding die is solidified to manufacture the spacer. In FIG. 14, the spacer 10 is indicated by a solid line for convenience, and a gate and a runner for injecting a molten resin material into the cavity of the molding die 50 are indicated by a broken line.

  As shown in FIG. 14, the spacer 10 is manufactured by injecting molten resin material into the cavity of the molding die 50 from a plurality of gates and solidifying the molten resin material filled in the cavity. The A core is appropriately used for the molding die 50 as necessary. The protrusion 42 of the spacer body 10a after the resin molding is provided with a gate remaining portion 42a that remains in a protruding state including a burr or the like as a gate trace into which the molten resin is injected. For example, it is appropriately removed by using a polishing mechanism or a cutting mechanism (not shown) in the finishing process.

  In this case, since the pair of protruding portions 42b, 42b provided on the protrusion 42 of the spacer body 10 is provided so as to contact the inner side wall 18b of the water jacket 18, the gate remaining portion 42a including burrs or the like It is sufficient that the amount of protrusion is not more than a predetermined amount so as not to contact the inner side wall 18b of the jacket 18, and the dimensional accuracy in the gate remaining portion 42a can be set roughly.

  Further, since a plurality of gates for injecting molten resin into the cavity of the molding die 50 are provided in the vicinity of the upper edge on the inner peripheral side of the spacer body 10a after molding, It can be filled so as to extend to every corner of the lower leg portions 36a to 36c and the like. That is, the molten resin can smoothly flow into the periphery of the long groove 26 of the leg portions 36a and 36b formed by bifurcating and into the lowermost portion, and the leg portions 36a to 36a extending to the lower side of the spacer body 10a. The dimensional accuracy (shape accuracy) of 36c can be improved.

  Further, the plurality of protrusions 42 provided in the vicinity of the upper edge on the inner peripheral side of the spacer main body 10 a are provided at gate positions that are inlets for injecting a molten resin material into the cavity of the molding die 50 when the spacer 10 is manufactured. . In the present embodiment, the plurality of protrusions 42 provided at the gate position are used as contact means for contacting the inner side wall 18b of the water jacket 18 (however, the abutment against the inner side wall 18b is performed on both sides of the projection 42). The remaining overhang portions 42b and 42b do not contact the gate remaining portion 42a at the center of the protrusion 42), and it is possible to smoothly control the flow of cooling water in the water jacket 18 without providing unnecessary protrusions. can do.

  The gate remaining part 42a including burrs and the like is deleted in a finishing process which is a subsequent process, but even if the entire gate remaining part 42a is removed, it does not necessarily become a flat surface. Therefore, in the present embodiment, without using the removal surface from which the gate remaining portion 42a is removed as a reference surface, dimensional accuracy is not obtained, and the overhang portions 42b and 42b provided at both side corners of the gate remaining portion 42a are used as the water jacket. By abutting against the inner side wall 18b of the spacer 18, the spacer 10 can be held at a predetermined position with high accuracy (see FIG. 7 (a) and FIG. 7 (b) for comparison).

  Next, an assembling process for assembling the spacer 10 manufactured as described above as a cooling structure of the internal combustion engine will be described. In addition, the elastic body 28 shall be previously manufactured by the rubber | gum material, such as a synthetic rubber or a natural rubber, for example in the predetermined shape shown by Fig.9 (a).

  At both ends of the spacer 10 formed by resin molding using the molding die 50 along the cylinder row direction, long grooves 26 are formed along the vertical direction. Therefore, as shown in FIG. 9B, the protrusion 28c of the elastic body 28 is slid along the slit 38 in a state of being directed downward and toward the inner peripheral side of the spacer body 10a, and communicated with the slit 38. The elastic body 28 is inserted into the long groove 26 to be formed. In this case, the thick rectangular portion 28b of the elastic body 28 is engaged with the vertically long opening portion 26a of the long groove 26, and the thin side portion 28a of the elastic body 28 is engaged with the side groove portion 26b of the long groove 26.

  In this way, the elastic body 28 is slid upward along the long groove 26, and the locking portion 28d formed on the back surface of the elastic body 28 is locked in the window 40 formed in the spacer body 10a. The elastic body 28 is mounted on the spacer body 10a in a state where the elastic body 28 is positioned at a predetermined position.

  After the elastic body 28 is attached to the spacer main body 10 a and the spacer 10 is completed, the completed spacer 10 is inserted into the water jacket 18 of the cylinder block 14. The spacer 10 may be inserted into the water jacket 18 by, for example, pressing it into the water jacket 18 using a robot hand (not shown) that can be displaced along a plurality of axes including XYZ axes orthogonal to each other. For example, after the spacer 10 is manually inserted into the upper surface opening 18 a of the water jacket 18, the spacer 10 may be pressed to the back of the water jacket 18 using a jig (not shown).

  The insertion of the spacer 10 into the water jacket 18 is regulated by, for example, the leg portions 36 b and 36 b and the other leg portions 36 c provided at the lower portion of the spacer 10 coming into contact with the bottom wall 18 d of the water jacket 18. At that time, the spacer main body 10a does not contact the bottom wall 18d of the water jacket 18, and a plurality of protrusions 42 provided on the inner peripheral side of the spacer 10 contact the inner side wall 18b of the water jacket 18, and the cylinder The protrusions 28 c (ridge line portions 28 e) of the elastic bodies 28 provided at both ends along the row direction are in contact with the inner side wall 18 b of the water jacket 18, so that the water jacket 18 is fixed at an intermediate position in the depth direction. .

  The leg portions 36a, 36a provided in the lower part of the spacer 10 in the cylinder row direction are slightly shorter in the vertical direction than the leg portions 36b, 36b and the other leg portions 36c opposed in the cylinder row direction. Since it is set, it does not contact the bottom wall 18d of the water jacket 18 and is inserted into the water jacket 18 in a floating state (see FIG. 6). In this case, the spacer 10 is supported at three points including the leg portions 36b and 36b and the other leg portions 36c provided at the lower portion (three-point support structure), so that a manufacturing error (dimension error) or the like is temporarily assumed. Even if it exists, it can support stably and can contribute to the behavioral stability of the spacer 10.

  When the spacer 10 is inserted into the water jacket 18, the elastic bodies 28 are disposed at both ends along the cylinder row direction of the spacer 10, and the protrusions 28 c of the elastic bodies 28 are in close contact with the inner side wall 18 b of the water jacket 18. Thus, a force is applied to press the spacer 10 toward the outer diameter side in the cylinder row direction. For this reason, the force which the intermediate part except the edge part of the cylinder row direction of the spacer 10 tends to deform | transform inside acts, and the some protrusion 42 provided in the spacer main body 10a is the inner side wall of the water jacket 18. The distance between the inner side wall 18b of the water jacket 18 and the protrusion 42 (clearance C) is reduced.

  When the spacing 42 becomes zero and the protrusion 42 contacts (contacts) the inner side wall 18b, the elastic body 28 disposed at both ends of the spacer 10 in the cylinder row direction with respect to the inner side wall 18b of the water jacket 18 is used. By adjusting the deformation allowance (deformation amount), the force with which the plurality of protrusions 42 provided on the inner side of the spacer main body 10 a abut against the inner side wall 18 b of the water jacket 18 is increased, and the spacer 10 is spread over the entire circumference of the water jacket 18. Can be kept uniform.

  Further, since the vertical cross section along the vertical direction of the water jacket 18 is formed in a tapered shape that gradually becomes narrower from the opening 18a side of the upper surface toward the bottom wall 18d, the lower side flow path of the water jacket 18 is formed. Compared with the separation distance D in 24b, the separation distance D in the upper flow path 24a of the water jacket 18 becomes larger, and the separation distance D in the upper flow path 24a can be easily set.

  In this case, a plurality of protrusions 42 provided on the upper side along the axial direction of the cylinder bores and arranged to face the connecting portion (inter-cylinder portion) between adjacent cylinder bores abut on the inner side wall 18b of the water jacket 18. The protrusions 28c of the pair of elastic bodies 28 provided on the lower side along the axial direction of the cylinder bores and arranged opposite to both ends in the cylinder bore row direction come into contact with the inner side wall 18b of the water jacket 18, It is possible to suitably avoid the rotation (swing) of the spacer 10 due to the cooling water flowing through the flow path 24 or the vibration of the engine 12.

  Accordingly, the protrusion 42 disposed on the upper side along the axial direction of the cylinder bore and the protrusion 28c disposed on the lower side along the axial direction of the cylinder bore are brought into contact with the inner side wall 18b or the outer side wall 18c of the water jacket 18. By holding the spacer 10, the behavior of the spacer 10 can be stabilized.

  As a result, it is possible to suppress the generation of a hitting sound caused by the spacer 10 itself coming into contact with the inner side wall 18b or the outer side wall 18c, and to improve the quietness of the passenger compartment when the engine 12 is mounted on the vehicle. In the present embodiment, for example, the wall surface of the water jacket 18 is formed in a complicated shape by causing the protrusions 42 and the protrusions 28 c that protrude from the spacer body 10 a toward the wall surface of the water jacket 18 to function as the protrusions. Even if it is a case, the said protrusion part can be contact | abutted and the spacer 10 can be hold | maintained suitably.

Next, a cooling water flow path (cooling passage structure) in a state where the spacer 10 is inserted into the water jacket 18 of the cylinder block 14 will be described.
Cooling water supplied to the cooling water inlet 20a of the cylinder block 14 via a water pump (not shown) flows in the water jacket 18 along one cylinder row direction (front side in FIG. 1), and enters the cooling water inlet. After making a U-turn at the end in the cylinder row direction far from 20a, it circulates in the water jacket 18 along the other cylinder row direction (the back side in FIG. 1), and the cylinder head 16 side is shown from the cooling water outlet 20b. Not led to a water jacket. In this way, the coolant flows along the water jacket 18, whereby the bore wall around the cylinder bore is cooled, and a combustion chamber (not shown) can be suitably cooled from the outside.

  The flow path of the cooling water is not limited to the above. For example, the coolant is introduced from one end of the cylinder block 14 along the cylinder bore row direction, and the water along the cylinder bore row direction is interposed between the plurality of cylinder bores. After flowing in both sides (both sides) of the jacket 18 in parallel, the jacket 18 may be led out from the other end of the cylinder block 14 along the cylinder bore line direction.

Next, the flow state of the cooling water in a predetermined portion in the water jacket 18 in which the spacer 10 is inserted will be described below.
FIG. 10 is a longitudinal cross-sectional view of a portion between adjacent cylinders (between cylinder bores) along the line BB in FIG. FIG. 5 is a general part excluding the part between the cylinders, and is a longitudinal sectional view of the cylinder bore of the cylinder block along the line AA in FIG.

  As shown in FIG. 5, in the general part, the vicinity of the top dead center along the axial direction of the cylinder bore (the top dead center position of the piston 60 is indicated by a solid line) and the vicinity of the bottom dead center (the bottom dead center of the piston 60). A spacer 10 (spacer main body 10a) is disposed at an intermediate position between the positions indicated by a two-dot chain line), and any spacer 10 (spacer main body 10a) is provided in the vicinity of the top dead center and the vicinity of the bottom dead center. It is not a space part. Accordingly, in the water jacket 18, main flow paths (upper flow path 24a and lower flow path 24b) through which the cooling water flows are formed on the upper side and the lower side of the spacer body 10a formed in the space. In other words, the upper flow path 24a and the lower flow path 24b are formed corresponding to the top dead center position and the bottom dead center position of the piston 60 that slides and displaces in the cylinder bore. Similarly, also in the part between cylinders shown by FIG. 10, the upper side flow path 24a and the lower side flow path 24b are formed corresponding to the top dead center position and the bottom dead center position of the piston 60, respectively.

  In this case, the flow rate of the cooling water is set large in the upper flow path 24a and the lower flow path 24b of the spacer body 10a, and the space between the vicinity of the top dead center and the vicinity of the bottom dead center where the spacer body 10a is disposed. In the intermediate flow path 24c provided in the intermediate part (central part), the circulation amount of the cooling water is set small.

  As a result, the bore wall in the range where the piston sliding speed is higher than the top dead center and the bottom dead center is the spacer 10 (spacer body 10a) at the intermediate part (center part) where the circulation amount of the cooling water is set small. The clearance between the piston 60 slidably displaced in the cylinder bore and the bore wall is expanded by being surrounded and heated (heat-retained), and friction (friction resistance) generated between the piston 60 and the bore wall is increased. Can be reduced. Further, at the intermediate portion (center portion), the bore wall in the range where the piston sliding speed is higher than that of the top dead center and the bottom dead center is warmed (heated) by the spacer 10, whereby the piston 60 and the bore wall are formed. The viscosity (viscosity) of the lubricating oil between them can be reduced, and the sliding resistance can be reduced. Note that when the spacer 10 is inserted into the water jacket 18 as in the present embodiment, the capacity of the entire cooling water can be reduced compared to the case where the spacer 10 is not inserted, and the engine 12 is started. Early warm-up in time can be accomplished.

  As shown in FIG. 10, a tapered surface 62 including a pair of inclined surfaces inclined in a substantially C shape in the longitudinal section is formed in the vicinity of the upper portion of the inner side wall 18 b of the water jacket 18 in the inter-cylinder region. Yes. The tapered surface 62 is set at a position where the lower portion of the tapered surface 62 and the upper surface 11 of the spacer 10 are substantially coincident or close to each other in the horizontal direction, and the cooling water flows along the upper flow path 24 a of the water jacket 18. At this time, the circulation amount of the cooling water (flow passage area) is increased by circulating the cooling water along the tapered surface 62 (inclined surface) so as to bypass the inside of the upper side flow passage 24a and to be largely curved (FIG. 16). See), and a portion (part near the top dead center) that becomes particularly hot between adjacent cylinder bores can be suitably cooled.

  Overhang portions 42b and 42b projecting toward the inner side wall 18b (inner wall on the cylinder bore side) of the water jacket 18 are provided on both sides of the gate remaining portion 42a (material introduction portion) of the spacer 10 in the cylinder bore row direction. The protruding portions 42b and 42b abut against the inner side wall 18b and support the spacer 10 at two points, whereby the play of the spacer 10 can be suppressed. As a result, the behavior of the spacer 10 inserted into the water jacket 18 can be stabilized. Further, the gate remaining portion 42a functioning as the material introduction portion has a difficulty in making the projecting dimension toward the inner side wall 18b constant, and the gate remaining portion 42a is in contact with the inner side wall 18b of the water jacket 18. In comparison, the spacers 10 can be accurately supported at predetermined positions by bringing the protruding portions 42b and 42b into contact with the inner side wall 18b on the cylinder bore side.

  Further, the overhang portions 42b and 42b are provided closer to the inner side wall 18b on the cylinder bore side of the water jacket 18 than the gate remaining portion 42a (material introducing portion), so that the gate remaining portion 42b (material introducing portion) is provided. In addition, since the overhang portions 42b and 42b can be brought into contact with the inner side wall 18b on the cylinder bore side first, even if the gate remaining portion 42b (material introduction portion) protrudes to some extent, the influence can be reduced.

  Furthermore, since the overhang portions 42b and 42b are disposed in the vicinity of the gate remaining portion 42a (material introducing portion), the gate remaining during the manufacture of the spacer 10 by injection molding using the molding die 50 is used. The material flow from the portion 42a (material introducing portion) to the overhang portions 42b and 42b can be made favorable, and the shape of the overhang portions 42b and 42b can be formed with high accuracy to support the spacer 10 more stably. it can.

  According to the present embodiment, the spacer 10 inserted into the water jacket 18 can be easily pulled out by locking the first catch 32 provided on the upper surface 11 of the spacer body 10a with, for example, a tool. Can do. When the spacer 10 is pulled out from the water jacket 18, the first catch 32 is provided at a position along the cylinder bore axis direction of the elastic body 28 (contact member). The spacer 10 can be pulled out from the water jacket 18 while maintaining the state in contact with the spacer 10, and deformation of the spacer 10 can be preferably avoided.

  In addition, according to the present embodiment, the heads 32b and 32b of the first catch portion 32 provided on the spacer 10 are formed along the circumferential direction of the cylinder bore, so that they are the same or substantially the same as the flow direction of the cooling water. It can be avoided that the flow of cooling water is obstructed by extending in the direction.

  Furthermore, according to the present embodiment, the first hook 32 extends to the vicinity of the opening 18a of the water jacket 18 in the cylinder bore axial direction with respect to the protrusion 28c of the elastic body 32 (tapered portion 32a). By providing the head 32b and the constricted portion 32c), the first catching portion 32 can be easily locked without inserting a tool or the like into the inner portion of the water jacket 18.

  Furthermore, according to the present embodiment, the spacer main body 10a surrounding the periphery of the cylinder bore is provided, and the extending portion extends to the opening 18a side of the water jacket 18 in the cylinder bore axial direction from the spacer main body 10a. Provided. Accordingly, in the present embodiment, the first catching portion 32 can be positioned closer to the opening 18a of the water jacket 18 than the spacer main body 10a, and the first catching portion 32 can be easily made without hindering the spacer main body 10a. Can be locked.

  Furthermore, according to the present embodiment, the second catching portion 34 is provided at a position along the cylinder bore axis direction of the partition portion 46 (thick portion) that is formed relatively thick with respect to the general portion and has high rigidity. By locking the second catch portion 34, the spacer 10 inserted into the water jacket 18 can be pulled out smoothly without being deformed.

  Still further, according to the present embodiment, both the first hook portion 32 and the second hook portion 34 are provided, and by making the first hook portion 32 and the second hook portion 34 work together, the smoothness is further improved. And the spacer 10 can be pulled out easily.

10 spacer 10a spacer body 12 engine (internal combustion engine)
14 Cylinder block 18 Water jacket 18a Opening (water jacket opening)
18b Inner side wall (inner wall)
28 Elastic body (contact member)
32 1st hook part 32a Taper part (extension part)
32b Head (extension part)
32c Constriction part (extension part)
34 Second hooking part 46 Partition part (thick part)

Claims (3)

A spacer inserted into a water jacket formed around a cylinder bore of an internal combustion engine,
The spacer is provided with a contact member that contacts the inner wall of the water jacket,
On the opening side of the water jacket in the cylinder bore axial direction of the abutting member, a first hooking portion that is locked by a pulling means when pulling out the spacer from the water jacket is provided, and the first hooking portion is Formed along the circumferential direction of the cylinder bore,
The spacer has an extending portion that extends to the vicinity of the opening of the water jacket in the cylinder bore axis direction with respect to the contact member, and the first hooking portion is provided in the extending portion,
The spacer has a spacer body surrounding the entire circumference of the cylinder bore,
The extending portion is a spacer, wherein the extension Mashimasu Rukoto on the opening side of the cylinder bore axial direction of the water jacket than the spacer body. The spacer according to claim 1 ,
The spacer is provided with a thick part formed thicker than a general part surrounding the cylinder bore,
The spacer is characterized in that a second catching portion is provided on the opening side of the water jacket in the cylinder bore axis direction of the thick portion. The spacer according to claim 1 ,
The upper end of the first hooking portion is located below the upper surface of the cylinder block in a state where the spacer is inserted into the water jacket.

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