Internal combustion engine

Abstract

To provide a space-saving internal combustion engine capable of suppressing sagging down of a hose.SOLUTION: An internal combustion engine includes an internal combustion engine body, a hose extending in an almost horizontal direction along a side surface of the internal combustion engine body, and a heat insulator provided on the side surface and shielding the hose from heat of an exhaust system component. The heat insulator has a support portion for supporting the hose from a lower side in an almost vertical direction.SELECTED DRAWING: Figure 4

Description

Technical Field

[0001] The present invention relates to an internal combustion engine.

Background Art

[0002] In an internal combustion engine such as an engine, various hoses such as fuel hoses are routed along the side surface of the internal combustion engine body such as a cylinder block (see, for example, Patent Document 1). Since high-temperature exhaust system components are arranged around the cylinder block, the hoses are shielded from the heat of the exhaust system components by heat insulators.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] Since the hose is formed of a flexible material such as synthetic resin, for example, it may bend and sag due to its own weight. In this case, for example, there is a risk that the hose may be pinched when assembling a transmission to the internal combustion engine body. On the other hand, if the hose is fixed to the internal combustion engine body with a clip, the sagging of the hose can be suppressed, but an installation space for the clip is required in the internal combustion engine body.

[0005] Therefore, the present invention has been made in view of the above problems, and an object thereof is to provide a space-saving internal combustion engine capable of suppressing the sagging of a hose.

Means for Solving the Problems

[0006] The internal combustion engine of the present invention includes an internal combustion engine body and a side surface of the internal combustion engine body The upper part is not fixed to the internal combustion engine body. substantially horizontally It is pulled around, formed from a flexible material, and hangs down due to its own weight. a hose, So that it is sandwiched between the aforementioned side and the exhaust system componentsThe aforementioned side surface is provided with a heat insulator that shields the hose from the heat of the exhaust system components, and the heat insulator is A plate-shaped member that faces the aforementioned side surface and extends substantially parallel to it, having a side portion that covers the hose from the side of the internal combustion engine body between the side surface and the exhaust system component, The device has a support portion that supports the hose from below in a substantially vertical direction.

[0007] In the above internal combustion engine ,before The support portion and the side portion may be integrally formed plate-like members.

[0008] In the internal combustion engine described above, the heat insulator may have a notch between the support portion and the side portion.

[0009] In the internal combustion engine described above, the heat insulator may have fastening portions that are fastened to the side surface.

[0010] In the internal combustion engine described above, the heat insulator may have ribs along the direction in which the hose extends. [Effects of the Invention]

[0011] According to the present invention, the internal combustion engine can be made more compact, and hose sagging can be suppressed. [Brief explanation of the drawing]

[0012] [Figure 1] Figure 1 is a schematic plan view showing the side of the engine. [Figure 2] Figure 2 is a plan view showing an example of a heat insulator. [Figure 3] Figure 3 is a plan view showing the heat insulator and catalytic converter on the cylinder block. [Figure 4] Figure 4 is a plan view showing the heat insulator when the side of the cylinder head and cylinder block is viewed from the front. [Modes for carrying out the invention]

[0013] (engine) Figure 1 is a schematic plan view showing the side views 10A, 10B, 11A, 11B, 12A, and 12B of engine 9. Figure 1 shows engine 9 viewed from two directions.

[0014] Engine 9 is an example of an internal combustion engine, and is installed in vehicles such as hybrid cars. Engine 9 has an engine body 1 including a cylinder head 10, a cylinder block 11, and a crankcase 12, as well as a hose H and a heat insulator 2. Figure 1 shows the X, Y, and Z directions, which are orthogonal to each other. The X and Y directions coincide approximately to the horizontal, and the Z direction coincides approximately to the vertical.

[0015] In Figure 1, the cylinder head 10, cylinder block 11, and crankcase 12 are shown as rectangular parallelepipeds with roughly six flat surfaces, but in reality, various mechanical parts such as pumps and irregularities such as ribs are provided on their surfaces. The cylinder head 10, cylinder block 11, and crankcase 12 are stacked on top of each other in a substantially vertical direction. Also, the two sides 10A and 10B of the cylinder head are adjacent to each other, the two sides 11A and 11B of the cylinder block 11 are adjacent to each other, and the two sides 12A and 12B of the crankcase 12 are adjacent to each other. Sides 10A, 11A, and 12A are perpendicular to the Y direction, and side 10B, 11B, and 12B are perpendicular to the X direction.

[0016] The cylinder block 11 houses a piston (not shown) and a crankshaft 120 connected to the piston. The end of the crankshaft 120 is exposed on the side surface 11B of the cylinder block 11 and connected to the flywheel 30 of the transmission 31, indicated by the dotted line. This transmits power from the engine body 1 to the transmission 31.

[0017] The hose H extends substantially horizontally along the two side surfaces 10A, 10B, 11A, 11B of the cylinder head 10 and the cylinder block 11. The hose H is connected, for example, to a vacuum pump (not shown) for controlling the negative pressure of the vehicle's damping. The hose H is formed of, for example, synthetic resin or the like, and is bent substantially at a right angle between the side surfaces 10A, 11A and the side surfaces 10B, 11B. In FIG. 1, only a part of the hose H on the side surfaces 10A, 10B, 11A, 11B is shown.

[0018] On the front of the side surfaces 10A, 11A, a catalytic device 3 for purifying the exhaust gas of the engine 9 with a three-way catalyst is provided. The catalytic device 3 is an example of an exhaust system component of an internal combustion engine. The catalytic device 3 is heated by the flow of the high-temperature exhaust gas discharged from the engine body 1. Since the catalytic device 3 is located at a short distance from the hose H on the side surfaces 10A, 11A, the hose H is covered by the heat insulator 2.

[0019] The heat insulator 2 is provided on the side surfaces 10A, 11A and shields the hose H from the heat of the catalytic device 3. The portion of the hose H shielded by the heat insulator 2 is shown by a dotted line. The heat insulator 2 is formed of a metal such as iron or aluminum. Thereby, the deterioration of the hose H due to heat is suppressed.

[0020] For example, the heat insulator 2 is fastened to the fastening portion 110 provided on the side surface 10A by bolts or the like. Thereby, the heat insulator 2 is fixed to the engine body 1. The fastening portion 110 has, for example, a bolt hole for attaching a hook (not shown) for transporting the engine body 1. After removing the hook, the bolt hole is used for fastening the heat insulator 2.

[0021] Also, the heat insulator 2 supports the hose H from the lower side in the substantially vertical direction. Thereby, the sagging of the hose H to the lower side in the substantially vertical direction is suppressed.

[0022] If the heat insulator 2 is not provided, the sagging hose Hc will overlap, for example, the upper part of the side surface 12A of the crankcase 12 when viewed from the front. Therefore, during the vehicle assembly process, when the transmission 31 is assembled to the cylinder block 11 and the side surfaces 11B and 12B of the crankcase 12, there is a risk that the sagging hose Hc will get pinched between the side surfaces 11B and 12B and the transmission 31. To address this, the sagging of the hose Hc can be suppressed by fixing it to the engine body 1 with a clip, but this requires space on the engine body 1 to install the clip.

[0023] The heat insulator 2 supports the hose H, thereby preventing it from sagging, and thus enabling space savings in the engine body 1.

[0024] (Heat insulator) Figure 2 is a plan view showing an example of the heat insulator 2. Figure 2 shows the heat insulator 2 from a top view (viewpoint in the negative Z-axis direction), a side view (viewpoint in the negative Y-axis direction), and a front view (viewpoint in the positive X-axis direction), respectively.

[0025] The heat insulator 2 has a side portion 20 and a support portion 21. The side portion 20 is a plate-shaped member whose plate surface faces the side surfaces 10A and 11A of the engine body 1, and covers the hose H from the side of the engine body 1. The support portion 21 is a plate-shaped member whose plate surface faces upward in the vertical direction, and covers and supports the hose H from below in the vertical direction. The plate surface of the support portion 21 is curved downward in the vertical direction along the path of the hose H.

[0026] The support portion 21 and the side portion 20 are integrally formed, for example, from sheet metal. Therefore, the heat insulator 2 has higher strength than when the side portion 20 and the support portion 21 are formed individually and joined together.

[0027] The side portion 20 and the support portion 21 are bent so that their respective plate surfaces are approximately perpendicular to each other, with the side portion 20 being longer than the support portion 21. Both ends 20a and 20b of the side portion 20 in the longitudinal direction protrude outward from the support portion 21 and are bent toward the engine body 1 side (positive direction of the Y axis). At the end portion 20a, a notch 23 is provided along the longitudinal direction between the side portion 20 and the support portion 21. Therefore, bending the side portion 20 is easier than if the notch 23 were not present.

[0028] Furthermore, a fastening portion 203 is provided at the upper part of the side portion 20, approximately in the center, which is fastened to the cylinder head 10. The fastening portion 203 has a through hole 203a for inserting a bolt that opens toward the side portion 10A. This allows the heat insulator 2 to be easily fixed to the fastening portion 110 on the side portion 10A.

[0029] A rotation stopper 202 is provided at the upper part of the side portion 20, approximately in the center, so as to be adjacent to the fastening portion 203 in the longitudinal direction. The rotation stopper 202 bends from the upper part of the side portion 20 toward the side surface 10A, and when fastening the heat insulator 2 to the fastening portion 110 on the side surface 10A, it suppresses the rotation of the heat insulator 2 itself caused by the rotation of the bolt by coming into contact with other bolts.

[0030] Furthermore, the side portion 20 is provided with ribs 201 aligned with the direction in which the hose H extends. The ribs 201 are convex regions formed on the plate surface of the side portion 20 toward the side surface 11A. The ribs 201 improve the strength of the heat insulator 2. The ribs 201 may also be provided on the support portion 21.

[0031] Next, we will explain the function of heat insulator 2 in detail.

[0032] Figure 3 is a plan view showing the heat insulator 2 and catalyst device 3 on the cylinder block 11. Figure 3 shows the heat insulator 2 viewed from above in the Z direction.

[0033] The heat insulator 2 is positioned between the side surface 11A and the catalyst device 3. The side portion 20 of the heat insulator 2 is approximately parallel to the side surface 11A and covers the hose H from the side of the cylinder block 11 so as to separate the hose H on the support portion 21 from the catalyst device 3. The hose H is provided to extend approximately horizontally along the sides 11A and 11B and is bent at approximately a right angle at the corners 111 of the sides 11A and 11B. This bent portion Hb of the hose H is covered from the side by the end portion 20a of the side portion 20. In this way, the side portion 20 is positioned to the side of the cylinder block 11 along the path of the hose H, thereby shielding the hose H from the heat of the catalyst device 3.

[0034] Furthermore, the support portion 21 supports the hose H from below in a substantially vertical direction and shields the hose H from the heat of the catalyst device 3. In this way, the hose H is effectively shielded from heat from the sides and below by the heat insulator 2.

[0035] Figure 4 is a plan view showing the heat insulator 2 when the side surfaces 10A and 11A of the cylinder head 10 and cylinder block 11 are viewed from the front. Figure 4 shows the heat insulator 2 as viewed from the positive direction of the Y axis.

[0036] The support portion 21 supports the hose H from below in a substantially vertical direction, thereby suppressing sagging due to the weight of the hose H. The support portion 21 is positioned substantially perpendicular to the side surface 11A.

[0037] The fastening portion 203 of the heat insulator 2 is fastened to the fastening portion 110 of the cylinder head 10 by a bolt Ta. The fastening portion 110 has two bolt holes (not shown) adjacent to each other. The bolt Ta is inserted through the through hole 203a of the heat insulator 2 and the bolt hole of the fastening portion 110. Another bolt Tb is inserted through the other bolt hole of the fastening portion 110. The rotation stopper 202 of the heat insulator 2 comes into contact with the bolt Tb, thereby suppressing the rotation of the heat insulator 2 itself that occurs with the rotation of the bolt Ta.

[0038] Thus, in the engine 9 of this example, the heat insulator 2 is provided with a support portion 21 for supporting the hose H, so that the sagging of the hose H can be suppressed without using clips or the like. As a result, the engine body 1 can be made more compact, and assembly work, such as assembling the transmission 31 to the engine body 1, becomes easier.

[0039] In this example, hose H is given as a vacuum pump hose, but it is not limited to this; fuel hoses or hoses used in turbochargers may also be used. Furthermore, catalytic converter 3 is given as an exhaust system component, but it is not limited to this; an exhaust manifold or other components may also be used.

[0040] The embodiments described above are preferred examples of the present invention. However, the invention is not limited thereto, and various modifications are possible without departing from the spirit of the invention. [Explanation of symbols]

[0041] 1 Engine body (internal combustion engine body), 2 Heat insulator, 3 Catalytic converter (exhaust system component), 10 Cylinder head, 11 Cylinder block, 10A, 10B, 11A, 11B Side, 20 Side section, 21 Support section, 23 Notch, 201 Rib, 203 Fastening section

Claims

1. The internal combustion engine body, A hose made of a flexible material is routed along the side surface of the internal combustion engine body in a substantially horizontal direction without being fixed to the internal combustion engine body, and hangs down due to its own weight. It has a heat insulator provided on the side surface so as to be sandwiched between the side surface and the exhaust system component, which shields the hose from the heat of the exhaust system component, The aforementioned heat insulator is A plate-shaped member that faces the aforementioned side surface and extends substantially parallel to it, having a side portion that covers the hose from the side of the internal combustion engine body between the side surface and the exhaust system component, The hose has a support part that supports it from below in a substantially vertical direction. Internal combustion engine.

2. The support portion and the side portion are integrally formed plate-shaped members. The internal combustion engine according to claim 1.

3. The heat insulator has a notch between the support portion and the side portion. The internal combustion engine according to claim 2.

4. The heat insulator has fastening portions that are fastened to the side surface, An internal combustion engine according to any one of claims 1 to 3.

5. The heat insulator has ribs along the direction in which the hose extends. An internal combustion engine according to any one of claims 1 to 3.

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