Engine and spacer

Abstract

To provide an engine and a spacer which allow fine adjustment of a flow rate of cooling water that flows from a cylinder block to a cylinder head.SOLUTION: An engine comprises a cylinder block including a first jacket in which cooling water flows, a spacer disposed inside the first jacket, a cylinder head including a second jacket in which the cooling water flows from the first jacket, and a gasket interposed between the cylinder block and the cylinder head. The cylinder block includes a branch passage branched from the first jacket to supply the cooling water to an external device. The gasket includes a plurality of communication ports where the first and second jackets communicate with each other. The spacer includes a protrusion passing through a gap made for one of the plurality of communication ports that is the closest to the branch passage.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present invention relates to an engine and a spacer. [Background technology]

[0002] There is an engine in which cooling water flows from a jacket of a cylinder block to a jacket of a cylinder head through a plurality of communication holes formed in a gasket (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2007-285197 A Summary of the Invention [Problem to be solved by the invention]

[0004] In some cylinder blocks, a branch passage is provided that branches off from the jacket of the cylinder block to supply cooling water to an external device. The flow rate of cooling water passing through a communication port near such a branch passage may be affected by the flow rate of cooling water flowing through the branch passage. Therefore, it is conceivable to fine-tune the flow rate of cooling water passing through such a communication port by changing the size or shape of the communication port. However, there are manufacturing constraints on changing the size and shape of the communication port.

[0005] SUMMARY OF THE PRESENT EMBODIMENT An object of the present invention is to provide an engine and a spacer that enable fine adjustment of the flow rate of cooling water flowing from the cylinder block to the cylinder head. [Means for solving the problem]

[0006] The above object is to provide a cylinder block including a first jacket through which cooling water flows, a spacer disposed in the first jacket, a cylinder head including a second jacket through which cooling water flows from the first jacket, and a gasket interposed between the cylinder block and the cylinder head, wherein the cylinder block includes a branch passage branching from the first jacket for supplying cooling water to an external device, the gasket includes a plurality of communication ports that connect the first and second jackets to each other, and the spacer includes a protruding portion that penetrates one of the plurality of communication ports closest to the branch passage with a gap therebetween. the cylinder block includes a plurality of cylinder bores, the communication opening through which the protrusion penetrates includes a first edge extending along a circumferential direction of the cylinder bore as viewed in an axial direction of the cylinder bore that is closest to the communication opening through which the protrusion penetrates, and a second edge extending along the circumferential direction as viewed in the axial direction and positioned radially outward of the cylinder bore relative to the first edge, and a radial gap between the protrusion and the first edge is larger than a radial gap between the protrusion and the second edge. This can be achieved by the engine.

[0008] The protrusion may have a circumferential length greater than a radial thickness when viewed in the axial direction.

[0009] The communication port through which the protrusion penetrates may have a circumferential length greater than a radial width when viewed in the axial direction.

[0010] The above object is to provide a cooling system comprising: a main body portion arranged in a first jacket of a cylinder block through which cooling water flows; and a protruding portion protruding from the first jacket toward a cylinder head, the cylinder block including a branch passage branching from the first jacket to supply the cooling water to an external device, the cylinder head including a second jacket through which the cooling water flows from the first jacket via a gasket, the gasket including a plurality of communication ports that communicate the first and second jackets with each other, the protruding portion penetrating one of the plurality of communication ports closest to the branch passage with a gap therebetween. the cylinder block includes a plurality of cylinder bores, the communication opening through which the protrusion penetrates includes a first edge extending along a circumferential direction of the cylinder bore as viewed in an axial direction of the cylinder bore that is closest to the communication opening through which the protrusion penetrates, and a second edge extending along the circumferential direction as viewed in the axial direction and positioned radially outward of the cylinder bore relative to the first edge, and the radial gap between the protrusion and the first edge is larger than the radial gap between the protrusion and the second edge, This can also be achieved by means of spacers. Effect of the Invention

[0011] According to the present invention, it is possible to provide an engine and a spacer that enable fine adjustment of the flow rate of cooling water flowing from the cylinder block to the cylinder head. [Brief description of the drawings]

[0012] [Figure 1] FIG. [Diagram 2] FIG. [Diagram 3] 2. A cross-sectional view taken along the line AA in FIG. [Figure 4] FIG. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0013] 1 is an exploded perspective view of an engine 1. The engine 1 includes a cylinder block 10, a spacer 20, a gasket 30, and a cylinder head 40. In the Z direction, the cylinder block 10, the gasket 30, and the cylinder head 40 are stacked in this order from the bottom.

[0014] The cylinder block 10 is made of, for example, an aluminum alloy. The cylinder block 10 has cylinder bores 12, bolt holes 14, a first jacket 16, an introduction passage 17, and a branch passage 18. The four cylinder bores 12 are aligned in the X direction. The first jacket 16 is a groove-shaped flow passage surrounding the four cylinder bores 12. Cooling water is introduced into the first jacket 16 from an introduction port (not shown). A plurality of bolt holes 14 are formed around the first jacket 16. The introduction passage 17 merges with the first jacket 16 and is a passage for introducing cooling water from the outside to the first jacket 16. The branch passage 18 branches off from the first jacket 16 and extends in the -Y direction. The branch passage 18 is a passage for supplying cooling water from the first jacket 16 to an external device. The external device is, for example, an oil cooler, but may also be a supercharger, an EGR cooler, a heater, or the like.

[0015] The spacer 20 is disposed in the first jacket 16 of the cylinder block 10. The spacer 20 is made of, for example, resin. The spacer 20 has a main body 22 and a protruding portion 26. The main body 22 is curved along one side surface of each of the four cylinder bores 12. The main body 22 is located in the first jacket 16. The protruding portion 26 protrudes in the +Z direction from one end of the main body 22. That is, the protruding portion 26 protrudes from the first jacket 16 toward the cylinder head 40. The protruding portion 26 will be described in detail later. The cylinder bores 12 can be efficiently cooled by the cooling water flowing between the spacer 20 and the cylinder bores 12. The shape of the main body 22 is not limited to the shape shown in FIG. 1. For example, the main body 22 may be formed in a U-shape so as to surround both side surfaces of the four cylinder bores 12.

[0016] The gasket 30 is interposed between the cylinder head 40 and the cylinder block 10. The gasket 30 is made of, for example, metal, and is formed in a thin plate shape. The gasket 30 is provided with a plurality of openings 32, a plurality of bolt holes 34, and a plurality of communication holes 36. The plurality of openings 32 are provided at positions corresponding to the plurality of cylinder bores 12, respectively. The plurality of bolt holes 34 are provided at positions corresponding to the plurality of bolt holes 14, respectively. The plurality of communication holes 36 are provided at positions corresponding to the first jacket 16 of the cylinder block 10. Specifically, the plurality of communication holes 36 are provided at positions overlapping the first jacket 16 in the -Z direction.

[0017] The cylinder head 40 is made of a metal such as an aluminum alloy. The cylinder head 40 is attached to the upper side of the cylinder block 10. The cylinder head 40 is provided with a plurality of openings 42, a plurality of bolt holes 44, and a plurality of inlet ports 46. Each of the plurality of openings 42 defines an intake port and an exhaust port. The plurality of openings 42 are provided at positions corresponding to the plurality of openings 32 and the plurality of cylinder bores 12, respectively. The plurality of bolt holes 44 are provided at positions corresponding to the plurality of bolt holes 14 and the plurality of bolt holes 34, respectively. The plurality of inlet ports 46 are provided at positions corresponding to the plurality of communication ports 36, respectively. Therefore, the plurality of inlet ports 46 are also provided at positions overlapping the first jacket 16 in the -Z direction. The gasket 30 and the cylinder head 40 are fastened to the cylinder block 10 by bolts inserted into the bolt holes 14, 34, and 44.

[0018] FIG. 2 is a cross-sectional view of the engine 1. FIG. 2 illustrates a cross-section perpendicular to the X direction. FIG. 3 is a cross-sectional view taken along the line AA in FIG. 2. FIG. 3 illustrates a cross-section perpendicular to the Z direction. In other words, FIG. 3 is a view seen from the direction of the axis A of the cylinder bore 12. The cooling water flowing in the first jacket 16 flows into the second jacket 48 of the cylinder head 40 through the communication port 36. Therefore, the communication port 36 communicates the first jacket 16 and the second jacket 48 with each other. The protruding portion 26 of the spacer 20 disposed in the first jacket 16 protrudes in the +Z direction from the first jacket 16 of the cylinder block 10. The protruding portion 26 penetrates one of the multiple communication ports 36 and one of the multiple inlet ports 46. The tip of the protruding portion 26 is located in the second jacket 48 of the cylinder head 40 that communicates with the inlet port 46. Hereinafter, the communication port 36 and the introduction port 46 through which the protrusion 26 passes will be referred to as the communication port 36a and the introduction port 46a, respectively.

[0019] FIG. 4 is an enlarged view showing the periphery of the protrusion 26. FIG. 4 is a view seen from the direction of the axis A of the cylinder bore 12, as in FIG. 3. FIG. 4 shows the circumferential direction B and the radial direction R of the cylinder bore 12 closest to the protrusion 26. The communication port 36a and the introduction port 46a are each substantially rectangular, but the shape is not limited thereto. The introduction port 46a is larger than the communication port 36a. The communication port 36a is larger than the protrusion 26. That is, the protrusion 26 penetrates the communication port 36a with a gap. Here, the cooling water passing through the communication port 36a flows in the area between the protrusion 26 and the inner edge of the communication port 36a. Therefore, by changing the shape of the protrusion 26, the flow rate of the cooling water passing through the communication port 36a can be finely adjusted. Here, the communication port 36a is formed by, for example, pressing. There are restrictions on the size and shape of the opening that can be formed by such processing. Therefore, by changing the shape of the protrusion 26, the flow rate of the cooling water passing through the communication port 36a can be finely adjusted without being subject to manufacturing constraints of the communication port 36a.

[0020] The spacer 20 is made of resin and is manufactured by, for example, injection molding. Therefore, the shape of the protrusion 26 can be changed by modifying or changing the mold. Similarly, when the spacer 20 is made of metal, the shape of the protrusion 26 can be changed by modifying or changing the casting mold.

[0021] 4, the communication opening 36a includes a first edge 361 extending along the circumferential direction B, and a second edge 362 extending along the circumferential direction B and positioned outward of the first edge 361 in the radial direction R. A gap C1 between the protruding portion 26 of the spacer 20 and the first edge 361 is larger than a gap C2 between the protruding portion 26 and the second edge 362. Therefore, the flow rate of the cooling water flowing between the protruding portion 26 and the first edge 361 is larger than the flow rate of the cooling water flowing between the protruding portion 26 and the second edge 362. As a result, the cylinder bore 12 closest to the protruding portion 26 is efficiently cooled.

[0022] The length L of the protruding portion 26 in the circumferential direction B is greater than the thickness T in the radial direction R. Therefore, the size of the gap C1 is ensured. This ensures the opening area between the protruding portion 26 and the first edge 361. Therefore, the flow rate of the cooling water flowing between the protruding portion 26 and the first edge 361 is ensured.

[0023] Also, in the communication port 36a, the length L3 in the circumferential direction B is longer than the width W3 in the radial direction R. As described above, in the protrusion 26, the length L in the circumferential direction B is also greater than the thickness T in the radial direction R. Therefore, the shape between the protrusion 26 and the first edge 361 and the shape between the protrusion 26 and the second edge 362 are each substantially elliptical. Here, even if the opening area of ​​the perfect circular opening and the elliptical opening are the same, stagnation is more likely to occur around the perfect circular opening than around the elliptical opening. Therefore, the occurrence of stagnation is suppressed, and the flow rate of the cooling water passing through the communication port 36a is ensured.

[0024] The inlet 46a is formed larger than the communication port 36a. Even if there is an error in the installation position of the cylinder head 40 relative to the gasket 30, the shape of the inlet 46 can be prevented from affecting the flow rate of the cooling water that is finely adjusted by the protrusion 26.

[0025] As shown in FIG. 1 and FIG. 2, the communication port 36a is closer to the branch passage 18 than the other communication ports 36. Here, around the branch passage 18 and the communication port 36a, a part of the cooling water flows into the branch passage 18 and the communication port 36a, and the rest flows inside the first jacket 16. For this reason, the flow rate of the cooling water passing through the communication port 36a may be affected by the flow rate of the cooling water flowing through the branch passage 18. For example, if the flow rate of the cooling water flowing through the branch passage 18 increases, the flow rate of the cooling water passing through the communication port 36a may decrease. On the other hand, if the flow rate of the cooling water flowing through the branch passage 18 decreases, the flow rate of the cooling water passing through the communication port 36a may increase. The flow rate of the cooling water passing through the communication port 36a, which may be affected by the branch passage 18 in this way, is fine-tuned by adjusting the shape of the protrusion 26.

[0026] The communication opening 36a includes a third edge 363 and a fourth edge 364 that extend along the radial direction R and face each other in the circumferential direction B. The protrusion 26 is spaced apart from each of the third edge 363 and the fourth edge 364, but may be in contact with them.

[0027] The gap C2 may be zero. That is, the protrusion 26 may be in contact with the second edge 362 of the communication opening 36a. This ensures the size of the gap C1, and the cylinder bore 12 closest to the protrusion 26 is efficiently cooled.

[0028] Although the embodiments of the present invention have been described in detail above, the present invention is not limited to such specific embodiments, and various modifications and variations are possible within the scope of the gist of the present invention described in the claims. [Explanation of symbols]

[0029] 1 Engine 10 Cylinder block 16, 48 Jacket 20 Spacer 26 Protrusion 30 Gasket 36, 36a communication port 46, 46a entrance 40 Cylinder head

Claims

1. a cylinder block including a first jacket through which cooling water flows; A spacer disposed within the first jacket; a cylinder head including a second jacket through which cooling water flows from the first jacket; a gasket interposed between the cylinder block and the cylinder head, the cylinder block includes a branch passage branching from the first jacket to supply cooling water to an external device, the gasket includes a plurality of communication ports that communicate the first and second jackets with each other, the spacer includes a protruding portion penetrating one of the plurality of communication ports closest to the branch path with a gap therebetween, The cylinder block includes a plurality of cylinder bores. the communication port through which the protrusion penetrates includes: a first edge extending along a circumferential direction of the cylinder bore as viewed in an axial direction of the cylinder bore that is closest to the communication port through which the protrusion penetrates; and a second edge extending along the circumferential direction as viewed in the axial direction and positioned radially outward of the cylinder bore relative to the first edge, a gap in the radial direction between the protrusion and the first edge is larger than a gap in the radial direction between the protrusion and the second edge.

2. The engine according to claim 1 , wherein the protrusion has a circumferential length greater than a radial thickness when viewed in the axial direction.

3. The engine according to claim 2 , wherein the communication opening through which the protrusion penetrates has a circumferential length greater than a radial width when viewed in the axial direction.

4. a main body portion disposed within a first jacket of a cylinder block through which cooling water flows; a protruding portion protruding from the first jacket toward a cylinder head, the cylinder block includes a branch passage branching from the first jacket to supply cooling water to an external device, the cylinder head includes a second jacket through which cooling water flows from the first jacket via a gasket, the gasket includes a plurality of communication ports that communicate the first and second jackets with each other, The protrusion penetrates through one of the plurality of communication ports closest to the branch path with a gap therebetween, The cylinder block includes a plurality of cylinder bores. the communication port through which the protrusion penetrates includes: a first edge extending along a circumferential direction of the cylinder bore as viewed in an axial direction of the cylinder bore that is closest to the communication port through which the protrusion penetrates; and a second edge extending along the circumferential direction as viewed in the axial direction and positioned radially outward of the cylinder bore relative to the first edge, A spacer, wherein a gap in the radial direction between the protrusion and the first edge is larger than a gap in the radial direction between the protrusion and the second edge.

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