Internal combustion engine

Abstract

The internal combustion engine 1 includes a cylinder 10 in which a piston 15 reciprocates, a cylinder head 25 located above the cylinder, a gasket 30 provided between the cylinder 10 and the cylinder head 25, a stepped portion 20 formed at an upper end portion of an inner peripheral surface of the cylinder 10, a ring member 40 having a cylindrical shape provided to the stepped portion 20, and a sealing member 50 provided on an upper surface of the ring member 40 and sandwiched between the ring member 40 and the cylinder head 25.

Description

Technical Field

[0001] This invention relates to an internal combustion engine comprising a cylinder and a piston. Background Technology

[0002] In internal combustion engines, a ring member is provided on the stepped portion formed on the upper part of the inner circumferential surface of the cylinder. For example, Japanese Unexamined Patent Application Publication No. 2017-089410 discloses an internal combustion engine in which a scraper ring is provided on the stepped portion to remove putty adhering to the piston.

[0003] Existing technology

[0004] Patent documents

[0005] Patent Document 1: Japanese Unexamined Patent Application Publication No. 2017-089410 Summary of the Invention

[0006] The problem to be solved by the present invention

[0007] Although the stepped portion described above is located below the gasket positioned between the cylinder and the cylinder head, a gap exists between the ring member and the gasket positioned to the stepped portion. If a gap exists, the lower surface of the gasket may deform due to exposure to combustion gases, or combustion gases may flow around the outer peripheral surface of the ring member through the gap.

[0008] This disclosure is made in view of these points, and the purpose of this disclosure is to prevent adverse effects caused by the gap between the ring member and the washer.

[0009] The means to solve this problem

[0010] One aspect of this disclosure provides an internal combustion engine, comprising: a cylinder in which a piston reciprocates; a cylinder head located above the cylinder; a gasket disposed between the cylinder and the cylinder head; a stepped portion formed at an upper end of an inner circumferential surface of the cylinder; a ring member having a cylindrical shape disposed on the stepped portion; and a sealing member disposed on an upper surface of the ring member and sandwiched between the ring member and the cylinder head.

[0011] Furthermore, a space can be formed between the outer peripheral surface of the ring member and the inner peripheral surface of the stepped portion, and the sealing member can contact both the ring member and the gasket.

[0012] In addition, the sealing member can contact the ends of the upper surface of the ring member and the lower surface of the gasket.

[0013] Furthermore, a space can be formed between the outer peripheral surface of the ring member and the inner peripheral surface of the stepped portion, and the sealing member can contact both the ring member and the cylinder head.

[0014] In addition, the ring member may include a first portion facing the stepped portion and a second portion facing the side surface of the gasket, and the sealing member may contact both the second portion and the cylinder head.

[0015] Furthermore, the side surface of the washer can be positioned closer to the ring member than the inner circumferential surface of the stepped portion, and the width of the second portion can be smaller than the width of the first portion.

[0016] In addition, the sealing component can be formed in an annular shape.

[0017] Furthermore, the sealing member can be hollow along the circumferential direction and can be squeezed and deformed between the ring member and the cylinder head.

[0018] Furthermore, the material of the sealing components can be softer than that of the ring components and cylinder head.

[0019] In addition, the outer peripheral surface of the ring member can be a conical surface, such that the diameter of the ring member decreases downwards, and the inner peripheral surface of the step portion can be an inclined surface parallel to the conical surface of the ring member.

[0020] Effects of the present invention

[0021] According to this disclosure, adverse effects caused by the gap between the ring member and the washer can be prevented. Attached Figure Description

[0022] Figure 1 This is a schematic diagram showing the internal configuration of an internal combustion engine 1 according to an embodiment.

[0023] Figure 2 This is a schematic diagram showing an internal combustion engine 100 according to a comparative example.

[0024] Figure 3 This is a schematic diagram illustrating a first variant example of the internal configuration of the internal combustion engine 1.

[0025] Figure 4 This is a schematic diagram illustrating a second variant example of the internal configuration of the internal combustion engine 1. Detailed Implementation

[0026] <International Engine Configuration>

[0027] Reference Figure 1 Describe the construction of an internal combustion engine according to an embodiment.

[0028] Figure 1 This is a schematic diagram showing the internal configuration of an internal combustion engine 1 according to an embodiment. Figure 1 The diagram shows only a portion of the internal combustion engine 1, and other components have been omitted for ease of explanation.

[0029] For example, internal combustion engine 1 is an engine installed in a vehicle. Figure 1 As shown, the internal combustion engine 1 includes a cylinder 10, a piston 15, a stepped portion 20, a cylinder head 25, a gasket 30, a ring member 40, and a sealing member 50.

[0030] The cylinder 10 is made of metal and formed into a cylindrical shape. The piston 15 is housed in the cylinder 10.

[0031] Piston 15 reciprocates between top dead center and bottom dead center within cylinder 10. Figure 1 In the middle, piston 15 is located at top dead center. Piston ring 18 is fitted into a groove formed on the outer peripheral surface of piston 15.

[0032] like Figure 1 As shown, the stepped portion 20 is located at the upper end of the inner circumferential surface 11 of the cylinder 10. When the piston 15 is at top dead center, the stepped portion 20 is located above the piston ring 18. The stepped portion 20 is formed such that it extends circumferentially within the inner circumferential surface 11 of the cylinder 10. Furthermore, the stepped portion 20 is located below the washer 30. The stepped portion 20 has an inner circumferential surface 22 perpendicular to its bottom surface.

[0033] The cylinder head 25 is located above the cylinder 10. The cylinder head 25 is made of metal, and for example, of the same material as the cylinder 10.

[0034] A gasket 30 is disposed between the cylinder 10 and the cylinder head 25. The gasket 30 functions to enhance the airtightness of the cylinder 10. The side surface of the gasket 30 is positioned closer to the ring member 40 than the inner circumferential surface 22 of the stepped portion 20.

[0035] like Figure 1 As shown, the ring member 40 is disposed in the stepped portion 20. Specifically, the ring member 40 is assembled into the stepped portion 20. The ring member 40 is formed in a cylindrical shape and covers the circumference of the piston 15 located at the top dead center. The ring member 40 is made of metal. Here, the ring member 40 is made of the same material as the cylinder 10, but is not limited thereto, and may be made of a different material than the cylinder 10.

[0036] The ring member 40 is configured to narrow the space between the cylinder 10 and the piston 15. Specifically, the inner circumferential surface 43 of the ring member 40 is positioned closer to the outer circumferential surface of the piston 15 than the inner circumferential surface 11 of the cylinder 10. Without the ring member 40, the space between the inner circumferential surface 11 of the cylinder 10 and the outer circumferential surface of the piston 15 would be unused, reducing combustion efficiency. Conversely, by configuring the ring member 40 as in this embodiment, the unused space can be reduced, thereby increasing the compression ratio and improving fuel efficiency.

[0037] The lower surface 41 of the ring member 40 is in contact with the bottom surface of the stepped portion 20. The outer peripheral surface 42 of the ring member 40 is separated from the inner peripheral surface 22 of the stepped portion 20. Therefore, there is a space between the outer peripheral surface 42 of the ring member 40 and the inner peripheral surface 22 of the stepped portion 20.

[0038] like Figure 1 As shown, the sealing member 50 is disposed on the upper surface 44 of the ring member 40. Furthermore, the sealing member 50 is configured such that it is sandwiched between the ring member 40 and the cylinder head 25. Specifically, the ring member 40 and the cylinder head 25 sandwich the sealing member 50 and the gasket 30 in the middle. Moreover, the sealing member 50 is in contact with both the ring member 40 and the gasket 30. Specifically, the sealing member 50 is in contact with the end of the upper surface 44 of the ring member 40 and the lower surface 31 of the gasket 30. Because the sealing member 50 is in contact with the end of the lower surface 31 of the gasket 30, the sealing member 50 and the gasket 30 can easily come into close contact with each other.

[0039] Similar to the ring member 40, the sealing member 50 is formed in an annular shape. The interior of the sealing member 50 is hollow along the circumferential direction. Furthermore, the material of the sealing member 50 is softer than the materials of the ring member 40 and the cylinder head 25. Therefore, the sealing member 50 is compressed and deformed between the ring member 40 and the cylinder head 25. As a result, the sealing condition between the ring member 40 and the gasket 30 is enhanced, and the sealing member 50 is... Figure 2 The comparative examples shown have advantages.

[0040] Figure 2 This is a schematic diagram showing an internal combustion engine 100 according to a comparative example. In the comparative example, no... Figure 1 The sealing member 50 is shown. Furthermore, the upper surface 44 of the ring member 40 does not contact the lower surface 31 of the gasket 30, thus creating a gap between the ring member 40 and the gasket 30. When this gap forms, air or other gases from the cylinder enter the space between the outer peripheral surface 42 of the ring member 40 and the inner peripheral surface 22 of the stepped portion 20 (see [reference]). Figure 2 (See arrow shown). When a gap is formed, the washer 30 may deform due to, for example, the lower surface 31 of the washer 30 being exposed to combustion gases at high temperatures.

[0041] On the other hand, in this embodiment, since the sealing member 50 is in contact with the upper surface 44 of the ring member 40 and the lower surface 31 of the gasket 30, the formation of a gap between the ring member 40 and the gasket 30 can be prevented. In particular, since the sealing member 50 is in close contact with the ring member 40 and the gasket 30, air and the like can be effectively prevented from entering the space between the outer peripheral surface 42 of the ring member 40 and the inner peripheral surface 22 of the stepped portion 20. Furthermore, since the sealing member 50 is in contact with the lower surface 31 of the gasket 30, deformation of the gasket 30 due to exposure to fuel gas can be prevented.

[0042] <Variant Example>

[0043] In the following text, reference will be made to Figure 3 and 4 Two variant examples describing the internal configuration of internal combustion engine 1.

[0044] Figure 3 This is a schematic diagram illustrating a first variant example of the internal configuration of the internal combustion engine 1.

[0045] The shape of the ring member 140 in the first variant example is similar to Figure 1 The shape of the ring member 40 is different. This is because the configuration of the other components in the first variant example is different. Figure 1 The configurations shown are the same, so a detailed description of them will be omitted.

[0046] like Figure 3 As shown, the ring member 140 has a stepped shape. The ring member 140 has an upper portion 144 and a lower portion 142.

[0047] The lower portion 142 is the first part facing the step portion 20 and is assembled into the step portion 20. The lower surface 142a of the lower portion 142 is in contact with the bottom surface of the step portion 20.

[0048] The upper portion 144 is located above the stepped portion 20 and is the second portion facing the side surface of the gasket 30. The width of the upper portion 144 is smaller than the width of the lower portion 142. The sealing member 50 is disposed on the upper surface 144a of the upper portion 144.

[0049] In the first variant example, the sealing member 50 contacts both the ring member 140 and the cylinder head 25. Specifically, the sealing member 50 contacts both the upper portion 144 of the ring member 140 and the cylinder head 25.

[0050] In the first variant example, since the sealing member 50 is positioned such that it contacts both the ring member 140 and the cylinder head 25, a gap can be prevented from forming between the ring member 140 and the gasket 30. This effectively prevents air and the like from entering the space between the outer peripheral surface 146 of the ring member 140 and the inner peripheral surface 22 of the stepped portion 20. Furthermore, the lower surface 31 of the gasket 30 can be prevented from being exposed to fuel gases.

[0051] Figure 4 This is a schematic diagram illustrating a second variant example of the internal configuration of the internal combustion engine 1.

[0052] The shape of the stepped portion 220 and the ring member 240 in the second variant example is similar to... Figure 1 The shapes of the stepped portion 20 and the ring member 40 are different. This is because the configuration of the other components in the second variant example is different. Figure 1 The configurations shown are similar, so a detailed description of them will be omitted.

[0053] like Figure 4 As shown, with Figure 1 The inner circumferential surface 22 of the stepped portion 220 is different; the inner circumferential surface 222 of the stepped portion 220 is a conical surface. The inner circumferential surface 222 is inclined at a predetermined angle.

[0054] like Figure 4 As shown, the outer peripheral surface 242 of the ring member 240 is a tapered surface, causing the diameter of the ring member 240 to decrease downwards. That is, the width of the upper portion of the ring member 240 is greater than the width of the lower portion. Furthermore, the outer peripheral surface 242 is parallel to the inner peripheral surface 222 of the stepped portion 220. That is, the inclination angle of the outer peripheral surface 242 is the same as the inclination angle of the inner peripheral surface 222. It should be noted that... Figure 1 The sealing member 50 described herein is disposed on the upper surface 244 of the ring member 240.

[0055] In the second variant example, since the outer peripheral surface 242 of the ring member 240 is a tapered surface and the inner peripheral surface 222 of the stepped portion 220 is an inclined surface, the ring member 240 can be easily assembled into the stepped portion 220 compared to the case where neither the tapered nor the inclined surface is provided. Furthermore, when the ring member 240 is assembled into the stepped portion 220, it can be prevented from being hooked or damaged by the stepped portion 220.

[0056] <Effects of this implementation method>

[0057] The internal combustion engine 1 of the above-described embodiment includes a ring member 40 having a cylindrical shape and a sealing member 50. The ring member 40 is disposed on a stepped portion 20 formed on the upper end portion of the cylinder 10, and the sealing member 50 is disposed on the upper surface of the ring member 40 and sandwiched between the ring member 40 and the cylinder head 25. The sealing member 50 described above is provided to prevent the formation of a gap between the ring member 40 and the gasket 30. Therefore, air and the like can be effectively prevented from entering the space between the outer peripheral surface 42 of the ring member 40 and the inner peripheral surface 22 of the stepped portion 20, and the gasket 30 can be prevented from deforming due to the lower surface 31 of the gasket 30 being exposed to fuel gases.

[0058] This disclosure has been described based on exemplary embodiments. The technical scope of this disclosure is not limited to the scope described in the above embodiments, and various changes and modifications can be made within the scope of this disclosure. For example, all or part of the device may be configured with any functionally or physically distributed or integrated units. Furthermore, new exemplary embodiments resulting from any combination of embodiments are included in the exemplary embodiments. Moreover, the effects of new exemplary embodiments resulting from combinations also have the effects of the original exemplary embodiments.

[0059] Description of reference numerals in the attached figures

[0060] 1. Internal Combustion Engine

[0061] 10 cylinders

[0062] 15 Pistons

[0063] 20 steps

[0064] 25 Cylinder head

[0065] 30 Washer

[0066] 40 ring components

[0067] 50 Sealing components

[0068] 140 ring components

[0069] 220 steps

[0070] 240 ring components

Claims

1. An internal combustion engine, comprising: Cylinder, in which the piston reciprocates; Cylinder head, located above the cylinder; A gasket is disposed between the cylinder and the cylinder head; The stepped portion is formed at the upper end of the inner circumferential surface of the cylinder; A ring member, having a cylindrical shape, is disposed on the stepped portion; as well as A sealing member is disposed on the upper surface of the ring member and sandwiched between the ring member and the cylinder head. A space is formed between the outer peripheral surface of the ring member and the inner peripheral surface of the stepped portion. The sealing member is in contact with the upper surface of the ring member and the lower surface of the gasket.

2. The internal combustion engine according to claim 1, wherein, The side surface of the washer is positioned closer to the ring member than the inner circumferential surface of the stepped portion.

3. The internal combustion engine according to claim 1, wherein, The sealing member is formed in an annular shape.

4. The internal combustion engine according to claim 3, wherein, The sealing member is hollow along the circumferential direction and is compressed and deformed between the ring member and the cylinder head.

5. The internal combustion engine according to claim 4, wherein, The material of the sealing member is softer than the materials of the ring member and the cylinder head.

6. The internal combustion engine according to claim 1, wherein, The outer peripheral surface of the ring member is a tapered surface, such that the diameter of the ring member decreases downwards. The inner circumferential surface of the stepped portion is an inclined surface parallel to the conical surface of the ring member.

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