JP2018105275A - Water jacket spacer - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a water jacket spacer for realizing a stable liner heat insulation capacity.SOLUTION: This invention shows a feature that there are provided a spacer main body 10 arranged to extend along an entire circumference of a water jacket; a bore side seal lip part 14 extended at an upper end part of the spacer main body 10 toward a slant upward of inside to abut against a bore side inner wall surface; a counter-bore side seal lip part 13 extending toward outer slant upward direction to abut against the counter-bore side inner wall surface. A seal part S is formed between the spacer main body 10 and the bore side seal lip part 13, each of two cooling water passages U, Uis formed between the bore side seal lip part 13 and the counter-bore side seal lip part 14 and between the counter-bore side seal lip part 14 and the spacer main body 10, the counter-bore side seal lip part 14 is provided with one or two or more open holes 14a, each of cooling water flowing at two cooling water flow passages and having equal flow speed is contacted through said open holes 14a.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a water jacket spacer, and more particularly to a water jacket spacer that stably exhibits liner heat retaining performance.

  A groove called a water jacket for cooling water is provided around the bore wall of a cylinder block such as a water-cooled engine for an automobile, and the bore wall is cooled by circulating cooling water through the water jacket. Yes.

  The wall temperature in the bore axis direction tends to be higher on the combustion chamber side above the bore and lower on the crankshaft side (cylinder liner side) below the bore. This temperature gradient causes the bore inner diameter dimension to be non-uniform in the axial direction, which increases piston friction and affects the fuel efficiency of the engine.

  Conventionally, by inserting a water jacket spacer in the water jacket and controlling the cooling efficiency in the axial direction of the bore wall, the temperature difference in the axial direction is reduced to achieve a uniform temperature distribution and reduce piston friction. Is known (Patent Documents 1 and 2).

  The water jacket spacers in Patent Documents 1 and 2 are composed of a single resin or a combination of a resin and foamed water absorbing rubber. In either case, avoid a gap from the inner wall surface of the water jacket on the bore side. I can't.

  If there is a gap between the water jacket spacer and the inner wall surface on the bore side of the water jacket, cooling water will flow through this gap and the lower part of the bore will be cooled. The function of the spacer may be reduced.

JP 2005-256661 A JP 2007-71039 A WO2016 / 158043

  Therefore, in order to prevent the cooling water from entering between the inner wall surface of the bore of the water jacket with a simple structure, the applicant of the present invention has a water jacket spacer having a structure in which the cooling water in contact with the liner heat insulating portion is sealed by a rubber lip. (Patent Document 3).

  However, the water jacket spacer of Patent Document 3 also has room for further improvement from the viewpoint of more stably exhibiting the liner heat retaining performance.

  Then, this invention makes it a subject to provide the water jacket spacer which exhibits a liner heat retention performance stably.

  The other subject of this invention becomes clear by the following description.

  The above problems are solved by the following inventions.

(Claim 1)
A water jacket spacer that is inserted into a water jacket provided in a cylinder block around the bore and forms a flow path of cooling water flowing through the water jacket,
A spacer main body provided along the entire circumference of the water jacket, a bore side seal lip portion extending obliquely upward inside the spacer main body at an upper end portion of the spacer main body, and abutting on a bore side inner wall surface; An anti-bore side seal lip portion that extends obliquely upward on the outer side of the spacer body and contacts the anti-bore side inner wall surface at the upper end of the spacer body;
A sealing part is formed between the spacer body and the bore side seal lip part,
Two cooling water flow paths are respectively formed between the bore side seal lip portion and the anti-bore side seal lip portion, and between the anti-bore side seal lip portion and the spacer body,
1 or 2 or more through-holes are provided in the said anti-bore side seal lip part, and each cooling water with the same flow velocity which is the cooling water which flows through the said 2 cooling water flow paths has contacted via the said through-hole. Water jacket spacer characterized by.
(Claim 2)
It is a bore lower part side adjacent to a sealing part formed between the spacer body and the bore side seal lip part, and a liner heat insulating part is formed on the cylinder liner side,
2. The water according to claim 1, wherein each of the cooling waters having the same flow velocity is in contact with each other through the through-hole, thereby preventing the cooling water from flowing in the sealing part located in the liner heat-retaining part. Jacket spacer.
(Claim 3)
3. The water jacket according to claim 1, wherein the anti-bore side seal lip has an annular shape in which cylindrical surfaces are connected in a wave shape, and the through hole is disposed in the vicinity of the center of the cylindrical surface. spacer.

  ADVANTAGE OF THE INVENTION According to this invention, the water jacket spacer which exhibits liner heat retention performance stably can be provided.

The top view of the cylinder block of the water cooling engine to which the water jacket spacer of this invention was applied Sectional view along line (ii)-(ii) in FIG. Cross section of water jacket spacer removed from water jacket Perspective view of the water jacket spacer removed from the water jacket Schematic cross-sectional view illustrating a water jacket spacer according to a comparative example

  Embodiments of the present invention will be described below with reference to the drawings.

  FIG. 1 is a plan view of a cylinder block of a water-cooled engine to which a water jacket spacer of the present invention is applied, and the cylinder block is indicated by a one-dot chain line. 2 is a sectional view taken along line (ii)-(ii) in FIG. 1, FIG. 3 is a sectional view of the water jacket spacer removed from the water jacket, and FIG. 4 is a water jacket spacer removed from the water jacket. FIG.

  The cylinder block 100 is formed with a plurality of bores 101 and an open deck type groove-shaped water jacket 102 surrounding the periphery thereof. A liner 103 (see FIG. 2) is disposed between the bore 101 and the water jacket 102. A piston 104 is disposed in each bore 101 so as to be capable of reciprocating in the axial direction (vertical direction in FIG. 2).

  The liner 103 is a cylindrical body that is mounted around the bore 101 and has excellent wear resistance against sliding of the piston 104.

  Cooling water is supplied to the water jacket 102 via a cooling water supply path 105 formed in the cylinder block 100, and internal cooling water is discharged via a cooling water discharge path 106. The inlet from the cooling water supply path 105 and the outlet to the cooling water discharge path 106 are located at predetermined heights of the inner surface 102b on the opposite side of the water jacket 102 and open.

  A cylinder head 200 is provided on the upper portion of the cylinder block 100 as shown in FIG. The cylinder head 200 is fixed to the cylinder block 100 with a bolt (not shown) via a cylinder head gasket 300. Thereby, the upper part of the bore 101 is closed by the cylinder head 200, and the upper part of the water jacket 102 is closed by the cylinder head 200 and the cylinder head gasket 300. The cylinder head 200 and the cylinder head gasket 300 are closing members that close the upper portion of the water jacket 102. However, the cylinder head gasket 300 does not necessarily have to close the upper portion of the water jacket 102.

  A water jacket spacer 1 is inserted into the water jacket 102.

  The water jacket spacer 1 includes a spacer body 10 provided along the entire circumference of the water jacket 102.

  In the present embodiment, the spacer body 10 is constituted by a core material 11 and an elastic body 12 that is coated on the surface of the core material 11.

  In the present embodiment, the core material 11 is formed so as to have a shape substantially similar to the planar shape of the liner 103. That is, the core member 11 is formed to extend along the entire circumference of the water jacket 102 in a ring shape in which a plurality of cylindrical surfaces are connected in a wave shape so as to surround the plurality of bores 101. The core material 11 can be comprised, for example with a metal, resin, etc. Examples of the resin include polyamide-based resins.

  In the present embodiment, the elastic body 12 is provided over the entire circumference of the core material 11. Rubber is generally used as the elastic body 12, but is preferably non-foamed rubber containing no water-absorbing polymer material, that is, solid rubber.

  As the solid rubber, for example, EPDM (ethylene propylene rubber), HNBR (hydrogenated nitrile rubber), FKM (fluoro rubber) and the like can be preferably used. Such solid rubber can be integrated with the surface of the core material 11 by baking. Although not shown, the core member 11 may be mechanically fixed to the core member 11 without bonding by making a hole in the core member 11 and covering the hole so that the solid rubber passes therethrough.

  The spacer body 10 is integrally provided with a bore-side seal lip portion 13 extending obliquely upward inside the spacer body 10 at the upper end portion of the inner side surface over the entire circumference of the spacer body 10. .

  Further, the spacer body 10 is integrally provided with an anti-bore side seal lip portion 14 extending obliquely upward on the outer side of the spacer body 10 at the upper end portion of the outer surface thereof. The anti-bore side seal lip portion 14 is formed so that the protruding length from the spacer body 10 is sufficiently longer than the bore side seal lip portion 13.

  The bore side seal lip portion 13 and the anti-bore side seal lip portion 14 are integrally formed of the same elastic body as the elastic body 12 covering the core material 11.

  As shown in FIG. 3, with the water jacket spacer 1 removed from the water jacket 102, the width w from the tip of the bore side seal lip 13 to the tip of the anti-bore side seal lip 14 is the groove of the water jacket 102. It is formed larger than the width. Accordingly, the bore side seal lip 13 and the anti-bore side seal lip 14 form a tightening margin in the width direction with respect to the water jacket 102.

  The water jacket spacer 1 is inserted into the lower portion of the water jacket 102 so that the bore side seal lip portion 13 and the anti-bore side seal lip portion 14 face upward with respect to the spacer body 10.

  At this time, the width w of the water jacket spacer 1 is formed larger than the width of the water jacket 102 (forms a fastening allowance) as described above. Therefore, the bore-side seal lip 13 abuts along the entire circumference of the bore-side inner wall surface 102 a of the water jacket 102. Further, the anti-bore side seal lip portion 14 abuts along the entire circumference of the anti-bore side inner wall surface 102 b of the water jacket 102. Thereby, a self-sealing function is realized. Accordingly, the water jacket spacer 1 is positioned in the water jacket 102.

As a result, a sealing portion S is formed between the spacer body 10 and the bore side seal lip portion 13. With this sealing portion S, a liner heat retaining portion L (see FIG. 2) is formed on the lower bore side (cylinder liner side) adjacent to the sealing portion S.
Further, an upper cooling water flow path U ₁ is formed between the bore side seal lip portion 13 and the anti-bore side seal lip portion 14. Furthermore, a lower cooling water flow path U ₂ is formed between the anti-bore side seal lip 14 and the spacer body 10.

The sealing portion S forms the liner heat retaining portion L, thereby keeping the bore lower side (cylinder liner side) relatively low in temperature relative to the bore upper side. During normal use, the lower end portion of the spacer body 10 is in contact with the groove bottom of the water jacket 102. Further, as described above, the bore-side seal lip 13 is in contact with the liner inner wall surface 102a. Therefore, even if cooling water is circulated through the cooling water flow paths U ₁ and U ₂ in the water jacket 102, it is difficult for cooling water from the outside to enter the sealing portion S.

  When the liner heat retention by the sealing portion S is exhibited, the water jacket spacer 1 exhibits the function of uniforming the temperature distribution in the axial direction of the liner 103 and reducing the friction of the piston 104.

A through-hole 14 a is provided in the non-bore side seal lip portion 14 of the water jacket spacer 1. In the present embodiment, the anti-bore side seal lip portion 14 has an annular shape in which the cylindrical surfaces are connected in a wave shape, and the circular through hole 14a is disposed near the center of the cylindrical surface.
A plurality of through holes 14 a are provided along the circumferential direction of the water jacket 102.
When the through hole is provided, the cooling water flow path U ₁ that is the flow path inside the anti-bore side seal lip portion 14 and the cooling water flow path U ₂ that is the flow path outside the anti-bore side seal lip portion 14 are provided. The cooling water flowing through the cooling water flow path and having the same flow velocity are in contact with each other through the through holes.
Since the flow rates of the two cooling waters are the same, the static pressures of the two cooling waters sandwiching the through hole are the same, and the static pressure around the sealing portion S surrounded by the two cooling waters is Since it is the same, it prevents that a cooling water flows through the inside of the sealing part located in a liner heat retention part.
If the cooling water flowing through the two cooling water flow paths and the cooling waters having the same flow velocity are in contact with each other through the through hole, as a result, the through hole is located inside the anti-bore side seal lip portion 14 (cooling water flow It can also be said that the cooling water flow rate in the path U ₁ ) and the cooling water flow rate outside the anti-bore side seal lip portion 14 (cooling water flow path U ₂ ) are made equal.
Therefore, the presence of the through hole provides an effect that the liner heat retention performance by the sealing portion S is more stably exhibited.

As shown in FIG. 5A, the water jacket spacer according to the comparative example having no through-hole has a cooling water flow velocity v1 inside the anti-bore side seal lip portion 14 (cooling water flow path U ₁ ) and an anti-bore. The cooling water flow velocity v2 outside the side seal lip portion 14 (cooling water flow path U ₂ ) is an independent flow velocity.
When the flow velocity v1 and the flow velocity v2 are different, as shown in FIG. 5B, the cooling water flows due to the static pressure difference in the slight gap of the sealing portion S.
That is, when the flow speed v1 <velocity v2, the cooling water flow path U ₁ the static pressure is large, through the sealing portion S, the flow of the cooling water occurs toward the cooling water flow path U _2.
As a result, the cooling water in the sealing portion S is replaced with cooling water from the outside which is lower in temperature, and temperature fluctuations in the sealing portion S may occur, which is solved in order to stabilize the liner heat retention performance. Issues that should remain.

According to the present invention, the flow rate v1 of the cooling water inside the anti-bore side seal lip portion 14 and the flow rate v2 of the cooling water outside the anti-bore side seal lip portion 14 are autonomous by the plurality of through holes 14a. Adjusted to be equal. This autonomous adjustment is not easily affected by changes in the flow rate or temperature of the cooling water.
Thereby, generation | occurrence | production of a static pressure difference is prevented and the liner heat retention performance by the sealing part S can be exhibited more stably.

  In the present embodiment, the shape of the through hole 14a is circular, but is not limited to this. The through hole may be, for example, an ellipse or a polygon such as a triangle, a quadrangle, a pentagon, a hexagon, and the like.

  In the present embodiment, a plurality (10 in the illustrated example) of the through holes 14a are provided at predetermined intervals in the circumferential direction of the anti-bore side seal lip portion 14, but the present invention is not limited to this. The arrangement interval and the number of the through holes 14a can be set as appropriate so that the flow velocity v1 and the flow velocity v2 described above are equal. The number of through holes 14a may be one or two or more, for example.

  In the present embodiment, the through hole 14a is disposed in the vicinity of the center of the cylindrical surface with respect to the anti-bore side seal lip portion 14 having an annular shape in which the cylindrical surfaces are connected in a wave shape, but the present invention is not limited to this. The arrangement of the through holes 14a can be set as appropriate so that the flow velocity v1 and the flow velocity v2 described above are equal. For example, the through hole 14a may be arranged at a connecting portion of the cylindrical surface. Further, the through hole 14a may be disposed above (on the distal end side of the anti-bore side seal lip portion 14) or below (on the base end side of the anti-bore side seal lip portion 14) from the center of the cylindrical surface.

  In the present embodiment, the spacer main body 10 is configured by the core material 11 and the elastic body 12 that is coated on the surface of the core material 11, but is not limited thereto. The spacer body 10 may be composed of only the core material 11. In this case, only the bore side seal lip portion 13 and the anti-bore side seal lip portion 14 can be constituted by the elastic body 12.

  In the present embodiment, the length of the anti-bore side seal lip portion 14 is a length that does not contact the cylinder head gasket 300 that is a closing member when inserted into the water jacket 102, but contacts the cylinder head gasket 300. It may have a length. Even if the length of the anti-bore side seal lip portion 14 is designed to be in contact with the closing member, due to the large tolerance of the groove width and depth of the water jacket 102, it is actually the same as the closing member. There may be a gap between the two.

  In this embodiment, the spacer body 10 is directly in contact with the groove bottom of the water jacket 102. However, a seal lip portion or a bead portion is provided at the lower end portion of the spacer body 10, and the seal lip portion or bead portion is attached to the water lip portion. You may make it contact the groove bottom of the jacket 102. FIG.

  In the present embodiment, the water jacket 102 is formed so as to become narrower toward the groove bottom, but is not limited thereto. The water jacket 102 only needs to be able to circulate cooling water. For example, the water jacket 102 may be formed with a certain width in the depth direction.

  In the above description, a through-hole is formed in the anti-bore side seal lip, and the cooling water flowing through the two cooling water flow paths and having the same flow velocity is in contact with each other through the through-hole. However, the flow velocity may be strictly controlled and equal, but a mode in which a certain amount of time elapses and the flow velocity becomes substantially equal may be used.

1: Water jacket spacer 10: Spacer body 11: Synthetic resin core material 12: Elastic body 13: Bore side seal lip 14: Anti-bore side seal lip 14a: Through hole 100: Cylinder block 101: Bore 102: Water jacket 102a : bore inner wall surface 102b: counter bore inner wall surface 103: liner 104: piston 105: cooling water supply passage 106: cooling water discharge passage 200: cylinder head 300: cylinder head gasket S: seal U _{1, U 2:} cooling Water flow path L: Liner insulation

Claims (3)

A water jacket spacer that is inserted into a water jacket provided in a cylinder block around the bore and forms a flow path of cooling water flowing through the water jacket,
A spacer main body provided along the entire circumference of the water jacket, a bore side seal lip portion extending obliquely upward inside the spacer main body at an upper end portion of the spacer main body, and abutting on a bore side inner wall surface; An anti-bore side seal lip portion that extends obliquely upward on the outer side of the spacer body and contacts the anti-bore side inner wall surface at the upper end of the spacer body;
A sealing part is formed between the spacer body and the bore side seal lip part,
Two cooling water flow paths are respectively formed between the bore side seal lip portion and the anti-bore side seal lip portion, and between the anti-bore side seal lip portion and the spacer body,
1 or 2 or more through-holes are provided in the said anti-bore side seal lip part, and each cooling water with the same flow velocity which is the cooling water which flows through the said 2 cooling water flow paths has contacted via the said through-hole. Water jacket spacer characterized by. It is a bore lower part side adjacent to a sealing part formed between the spacer body and the bore side seal lip part, and a liner heat insulating part is formed on the cylinder liner side,
2. The water according to claim 1, wherein each of the cooling waters having the same flow velocity is in contact with each other through the through-hole, thereby preventing the cooling water from flowing in the sealing part located in the liner heat-retaining part. Jacket spacer. 3. The water jacket according to claim 1, wherein the anti-bore side seal lip has an annular shape in which cylindrical surfaces are connected in a wave shape, and the through hole is disposed in the vicinity of the center of the cylindrical surface. spacer.

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