CN111566393A - Sealing structure for internal combustion engine - Google Patents
Sealing structure for internal combustion engine Download PDFInfo
- Publication number
- CN111566393A CN111566393A CN201780097964.4A CN201780097964A CN111566393A CN 111566393 A CN111566393 A CN 111566393A CN 201780097964 A CN201780097964 A CN 201780097964A CN 111566393 A CN111566393 A CN 111566393A
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- China
- Prior art keywords
- seal
- gasket
- cylinder head
- internal combustion
- combustion engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02F—CYLINDERS, PISTONS OR CASINGS, FOR COMBUSTION ENGINES; ARRANGEMENTS OF SEALINGS IN COMBUSTION ENGINES
- F02F11/00—Arrangements of sealings in combustion engines
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16J—PISTONS; CYLINDERS; SEALINGS
- F16J15/00—Sealings
- F16J15/02—Sealings between relatively-stationary surfaces
- F16J15/06—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces
- F16J15/10—Sealings between relatively-stationary surfaces with solid packing compressed between sealing surfaces with non-metallic packing
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Gasket Seals (AREA)
Abstract
A seal structure for an internal combustion engine, wherein a gasket is interposed between a 1 st body component and a 2 nd body component that constitute a part of an engine body and are joined to each other in an adjacent manner, wherein the gasket (44) is formed by joining a plurality of seal portions (45, 46) made of different materials to each other via a joint portion (47) and joining the seal portions in a ring shape, and the entire outer periphery of the gasket (44) including the joint portion (47) is sandwiched between the 1 st body component and the 2 nd body component. Thus, the function required to pass only a part of the pair of annular seal portions between the main body component members can be satisfied by a small-sized gasket that avoids an increase in cost.
Description
Technical Field
The present invention relates to a seal structure for an internal combustion engine, in which a gasket is interposed between a 1 st body component and a 2 nd body component that are joined to each other in an adjacent manner among a plurality of body components that constitute an engine body.
Background
Patent document 1 discloses a seal structure for an internal combustion engine in which a gasket interposed between a pair of members joined to each other among a plurality of members constituting the internal combustion engine is composed of a 1 st annular seal portion, a 2 nd annular seal portion and a 3 rd annular seal portion adjacent to the 1 st annular seal portion, and a coupling portion coupling the 1 st annular seal portion to the 2 nd annular seal portion and the 3 rd annular seal portion, respectively, and the 1 st annular seal portion, the 2 nd annular seal portion, and the 3 rd annular seal portion are formed of different materials from each other.
Documents of the prior art
Patent document
Patent document 1: japanese patent laid-open publication No. 2013-190096
Disclosure of Invention
The gasket of the sealing structure disclosed in patent document 1 is configured such that, in addition to the annular sealing portion required for sealing between the adjacent two members, the coupling portion is required, which not only increases the size of the gasket, but also, when only a part of the entire outer periphery of the annular sealing portion requires high heat resistance, the entire outer periphery of the annular sealing portion needs to be formed of a material having high heat resistance, which increases the cost.
The present invention has been made in view of the above circumstances, and an object thereof is to provide a seal structure for an internal combustion engine, which can satisfy functions necessary for passing only a part of a pair of annular seal portions between main body constituent members by a small-sized gasket avoiding an increase in cost.
In order to achieve the above object, a first aspect of the present invention is a seal structure for an internal combustion engine, in which a gasket is interposed between a 1 st body component and a 2 nd body component that constitute a part of an engine body and are joined to each other in an adjacent manner, wherein the gasket is formed by joining a plurality of seal portions made of different materials to each other via a joint portion and connecting the seal portions in a ring shape, and the entire outer periphery of the gasket including the joint portion is interposed between the 1 st body component and the 2 nd body component.
In addition to the first aspect, the present invention is characterized in claim 1 in that the 1 st main body component is a cylinder head having an exhaust port, the gasket formed by bonding a pair of the sealing portions made of materials having different heat resistances is interposed between a cylinder head cover as the 2 nd main body component and the cylinder head, and at least a part of one of the pair of the sealing portions made of a material having a high heat resistance is arranged so as to overlap the exhaust port in a projection view projected onto a plane orthogonal to a cylinder axis.
The present invention is characterized as defined in claim 3 wherein, in addition to the feature 2, an exhaust device having a catalytic converter is connected to the exhaust port, and at least a part of the one seal portion is disposed so as to face the catalytic converter side on a projection onto a plane orthogonal to the cylinder axis.
In the present invention, according to any one of the 1 st to the 3 rd features, the 4 th feature is that the joint portion is formed in a concave-convex shape in which end portions of a pair of the seal portions adjacent to each other are fitted to each other.
In the present invention, according to the 2 nd or 3 rd aspect, the 5 th aspect is characterized in that the joint is formed by joining a 1 st inclined surface of the one seal portion facing the cylinder head cover side and a 2 nd inclined surface of the other seal portion facing the cylinder head side.
In addition to any one of the features 2 to 5, the present invention is characterized by feature 6 in that the side of the pair of seal portions having a larger reaction force is formed thinner than the side having a smaller reaction force.
Effects of the invention
According to the first aspect of the present invention, since the gasket is formed by joining and connecting a plurality of seal portions made of different materials to each other in a ring shape by the joining portions, and the entire outer periphery of the gasket including the joining portions is sandwiched between the 1 st and 2 nd body constituent members which are joined to be adjacent to each other, it is possible to satisfy the function required only by a part of the ring-shaped seal portion between the 1 st and 2 nd body constituent members by a small-sized gasket and avoid an increase in cost.
Further, according to the second aspect of the present invention, since at least a part of the sealing portion made of a material having high heat resistance in the gasket interposed between the cylinder head and the cylinder head cover overlaps the exhaust port in a projection view projected onto a plane orthogonal to the cylinder axis, the gasket is configured by the sealing portion made of the material having high heat resistance and the sealing portion made of the material having low heat resistance while ensuring heat resistance in the vicinity of the exhaust port having a large thermal influence, and thus the cost of the gasket can be reduced without making the entire gasket have excessive quality.
According to the third aspect of the present invention, since at least a part of the seal portion made of a material having high heat resistance is disposed on the side of the catalytic converter on the projection view projected onto the plane orthogonal to the cylinder axis, the heat resistance can be ensured by disposing the seal portion made of a material having high heat resistance on the side of the catalytic converter having a large thermal influence, and the cost of the gasket can be reduced without making the gasket entirely of excessive quality.
According to the 4 th aspect of the present invention, since the joining portion is formed in the uneven shape in which the end portions of the pair of seal portions are fitted to each other, the joining strength of the joining portion can be increased and the pair of seal portions can be firmly joined.
According to the 5 th aspect of the present invention, since the joint is formed by joining the 1 st inclined surface facing the cylinder head cover side formed on one of the sealing portions made of a material having high heat resistance and the 2 nd inclined surface facing the cylinder head side formed on the other of the sealing portions, the range of the joint facing the cylinder head side having a large thermal influence is made of a material having high heat resistance by the sealing portions, the sealing portions are enlarged, the joint area can be enlarged to improve the joint strength, and the contact area of the sealing portions made of a material having high heat resistance with the cylinder head can be enlarged to secure heat resistance.
Further, according to the 6 th aspect of the present invention, the larger reaction force side of the pair of seal portions is made thinner than the smaller reaction force side, so that the 1 st and 2 nd main body components can be sealed with uniform sealing performance.
Drawings
Fig. 1 is a right side view of a motorcycle according to embodiment 1. (embodiment 1)
Fig. 2 is an enlarged right side view of the internal combustion engine. (embodiment 1)
Fig. 3 is a 3-way view of fig. 2 with the cylinder head cover omitted. (embodiment 1)
Fig. 4 is a 4-way view of fig. 3. (embodiment 1)
Fig. 5 is a top view of the gasket. (embodiment 1)
Fig. 6 is a cross-sectional view of the gasket and the cylinder head taken along the line 6-6 in fig. 5 to show modifications (a), (b), and (c) of the joint portion of the gasket. (embodiment 1)
Fig. 7 is a plan view of the gasket of embodiment 2. (embodiment 2)
Fig. 8 is a right side view of the motorcycle of embodiment 3. (embodiment 3)
Fig. 9 is a 9-way view of fig. 8 with the cylinder head cover omitted. (embodiment 3)
Description of the reference numerals
23. 65 DEG cylinder head as the 1 st main body constituent part
24. 66. Cylinder head cover as the 2 nd main body constituent part
33. 68. exhaust port
34. 69. exhaust apparatus
36. 71 catalyst converter
44. 50, 80 washer
45. 46, 51, 52, 81, 82. seal part
45c · 1 st inclined plane
46 c.2 th inclined plane
47. 53, 83. junction
CA. CB-cylinder axis
EA. EB. internal combustion engine
Detailed Description
Embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the up-down direction, the left-right direction, and the front-rear direction are directions viewed from a rider riding a motorcycle.
Embodiment 1
First, in fig. 1, a body frame FA of a scooter type two-wheeled motorcycle includes a front fork 11 that pivotally supports a front wheel WFA at a front end portion thereof and a head pipe 13 that steerably supports a steering handle 12 coupled to the front fork 11, and an internal combustion engine EA that generates power to drive a rear wheel WRA is vertically swingably supported by the body frame FA.
The engine body 14 of the engine EA is disposed in front of the rear wheel WRA and is swingably supported by the vehicle body frame FA. The output of the internal combustion engine EA is transmitted to the rear wheel WRA via a transmission (not shown) that is connected to the engine main body 14 and extends to the left of the rear wheel WRA, the rear wheel WRA is pivotally supported between the rear end of a support arm 15 that is connected to the engine main body 14 and is disposed on the right of the rear wheel WRA and the rear end of the transmission, and a rear cushion unit 16 is provided between the transmission and the rear portion of the vehicle body frame FA.
The vehicle body frame FA and a part of the internal combustion engine EA are covered with a vehicle body cover 17, and the vehicle body cover 17 has a pair of left and right foot rest portions 18 on which the feet of the occupant rest and is supported by the vehicle body frame FA. Further, a tandem type riding seat 19 disposed behind the leg portion 18 is disposed on the vehicle body cover 17.
In fig. 2 to 4, the internal combustion engine EA is an air-cooled type, and the engine main body 14 includes: a crankcase 21 rotatably supporting a crankshaft 20 having an axis extending in a vehicle width direction; a cylinder block 22 combined with the crankcase 21; a cylinder head 23 combined with the cylinder block 22; and a head cover 24 joined to the head 23, the cylinder axis CA of the engine main body 14 being slightly inclined forward in a nearly substantially horizontal manner. The cylinder block 22 and the cylinder head 23 of the engine main body 14 are covered with a cover (shroud) 25.
The intake device 27 connected to an intake port (not shown) provided in an upper side wall 23a facing the upper side of the cylinder head 23 includes: an air cleaner 28 disposed on the left side of the front upper portion of the rear wheel WRA; a throttle body 29 disposed between the air cleaner 28 and the cylinder head 23; a connecting pipe 30 connecting the air cleaner 28 and the throttle body 29; an intake pipe 31 connecting the throttle body 29 and the intake port, and a fuel injection valve 32 is attached to an upper portion of the intake pipe 31.
An exhaust port 33 is provided in a lower side wall 23b facing the lower side of the cylinder head 23. The exhaust device 34 connected to the exhaust port 33 includes: an upstream exhaust pipe 35 connected to the exhaust port 33 and connected to the lower side wall 23b of the cylinder head 23; a catalyst converter 36 that houses a catalyst 39 and is connected to the downstream end of the upstream exhaust pipe 35; a downstream side exhaust pipe 37 connected to a downstream end of the catalyst converter 36 and extending rearward; and an exhaust muffler 38 connected to a downstream end of the downstream-side exhaust pipe 37.
The catalyst converter 36 is disposed such that an upstream end thereof is disposed on the left side in the vehicle width direction and is substantially along the vehicle width direction below the cylinder block 22 in the engine main body 14. The upstream exhaust pipe 35 includes a lower extension portion 35a extending downward from the exhaust port 33, and a curved portion 35b connecting a downstream end of the lower extension portion 35a and an upstream end of the catalytic converter 36 and curved substantially in a horizontal plane in a J shape, and the downstream exhaust pipe 37 is connected to the downstream end of the catalytic converter 36 at a lower front portion on the right side of the crankcase 21, and extends rearward through a lower side portion on the right side of the crankcase 21. The exhaust muffler 38 is disposed on the right side of the rear wheel WRA and connected to the downstream end of the downstream exhaust pipe 37, and the upper portion of the exhaust muffler 38 is covered with a heat shield 40.
An ignition plug 41 is attached to a right side wall 23c of the engine body 14 facing the right side of the cylinder head 23 in the vehicle width direction, and an exhaust gas sensor 42 for detecting properties of exhaust gas flowing from the exhaust port 33 to the exhaust device 34 is attached thereto.
However, the gasket 44 of the present invention is interposed between the 1 st and 2 nd body components that are joined to each other in the adjacent manner and constitute a part of the engine body 14, among the crankcase 21, the cylinder block 22, the cylinder head 23, and the cylinder head cover 24 that constitute the engine body 14, in this embodiment, the 1 st body component is the cylinder head 23, and the 2 nd body component is the cylinder head cover 24.
Referring also to fig. 5, the gasket 44 is formed in a shape in which a plurality of seal portions made of different materials are joined and connected by joint portions in a ring shape, and in embodiment 1, the gasket 44 is formed in a shape in which a pair of seal portions made of different heat-resistant materials, i.e., a 1 st seal portion 45 and a 2 nd seal portion 46, are joined by a joint portion 47 in a substantially rectangular shape and connected in a ring shape, and the entire outer periphery of the gasket 44 including the joint portion 47 is sandwiched between the cylinder head 23 and the cylinder head cover 24.
The material forming the 1 st sealing part 45 is a material having high heat resistance, such as FKM, and the material forming the 2 nd sealing part 46 is a material having lower heat resistance than the material forming the 1 st sealing part 45, such as ACM or AEM.
The FKM is a polymer compound having a fluorine content (mass%) of 50 to 80%, and is classified by the following combinations of compounds (a) to (e). (a) A copolymer obtained by copolymerizing vinylidene fluoride (hereinafter, referred to as VDF) and hexafluoropropylene (hereinafter, referred to as HFP). (b) VDF, HFP and tetrafluoroethylene (hereinafter referred to as TFE) are copolymerized. (c) VDF, perfluoromethyl vinyl ether (hereinafter referred to as PMVE), and TFE were copolymerized. (d) VDF, TFE and propylene. (e) Copolymers of VDF, HFP, TFE, PMVE and ethylene.
The ACM is a special synthetic rubber whose main component is an acrylic ester, and is obtained by copolymerizing a few percent of an epoxy type, a (reactive) halogen type, or a carboxyvinyl (halogen) type crosslinking monomer with a single or a combination of two or more kinds of a skeletal monomer such as ethyl acrylate, butyl acrylate, methoxyethyl acrylate, or the like.
The AEM is a special synthetic rubber composed mainly of an acrylic ester and ethylene, and is obtained by copolymerizing a crosslinking monomer such as a carboxylic acid group with a skeletal monomer such as methyl propyl ester and ethylene.
As shown in fig. 4, the gasket 44 interposed between the cylinder head 23 and the cylinder head cover 24 is disposed such that at least a part of the 1 st sealing portion 45 made of a material having high heat resistance in the gasket 44 overlaps the exhaust port 33 in a projection view projected onto a plane orthogonal to the cylinder axis CA.
As shown in fig. 4, the exhaust device 34 connected to the exhaust port 33 has the catalytic converter 36 in an intermediate portion thereof, and at least a part of the 1 st seal portion 45 is disposed facing the catalytic converter 36 side in a projection view projected onto a plane orthogonal to the cylinder axis CA.
That is, as shown in fig. 4, the 1 st seal 45 is formed in a substantially U shape so as to occupy a range WA including a lower portion having the gasket 44 which is substantially rectangular and connected annularly and lower portions on both left and right sides.
However, as shown in fig. 5, since the joint 47 may be configured such that the end portions of the 1 st seal portion 45 and the 2 nd seal portion 46 are planes perpendicular to the longitudinal direction of these seal portions 45 and 46, the joint 47 may be configured as in the modification shown in fig. 6 (a) to (c).
In the modification shown in fig. 6 (a), the joining portion 47 has a shape of a projection and recess in which the end portions of the 1 st seal portion 45 and the 2 nd seal portion 46 adjacent to each other are fitted to each other, more specifically, a projection portion 45a having a shape in which a part of the end portion of the 1 st seal portion 45 is projected on the 2 nd seal portion 46 side into a recess portion 46a having a shape in which a part of the end portion of the 2 nd seal portion 46 is recessed on the 1 st seal portion 45 side, and in the modification shown in fig. 6 (b), a projection portion 45b having a shape in which the whole end portion of the 1 st seal portion 45 is projected in a triangular shape on the 2 nd seal portion 46 side into a recess portion 46b having a shape in which the whole end portion of the 2 nd seal portion 46 is recessed in a triangular shape on the 1 st seal portion 45 side. When the joining portion 47 is formed by such a concave-convex shape, the joining strength of the joining portion 47 can be increased, and the 1 st seal portion 45 and the 2 nd seal portion 46 can be firmly joined.
In the modification shown in fig. 6 (c), the joint 47 is formed by joining the 1 st inclined surface 45c formed on the 1 st seal 45 facing the cylinder head cover 24 and the 2 nd inclined surface 46c formed on the 2 nd seal 46 facing the cylinder head 23 to each other, and according to the structure of the joint 47, the 1 st seal 45 makes the range of the joint 47 facing the cylinder head 23 having a large thermal influence be made of a material having high heat resistance, and the 1 st seal 45 side is enlarged, so that the joint area can be enlarged to improve the joint strength, and the contact area of the 1 st seal 45 made of a material having high heat resistance to the cylinder head 23 can be enlarged to secure the heat resistance.
In addition, a difference may be generated in the reaction force of the 1 st seal portion 45 and the 2 nd seal portion 46, and in this case, the larger reaction force may be formed thinner than the smaller reaction force. That is, when the reaction force of the 1 st sealing part 45 is larger than the reaction force of the 2 nd sealing part 46, the thickness d1 of the 1 st sealing part 45 is set to be thinner than the thickness d2 of the 2 nd sealing part 46. Further, the reaction forces of the 1 st seal 45 and the 2 nd seal 46 may be appropriately changed, and the reaction force of the 1 st seal 45 may be set smaller than the reaction force of the 2 nd seal 46, in which case the thickness d2 of the 2 nd seal 46 is set smaller than the thickness d1 of the 1 st seal 45.
Next, describing the operation of embodiment 1, the gasket 44 is interposed between the cylinder head 23 and the cylinder head cover 24 which are joined to each other in a mutually adjacent manner and which constitute a part of the engine main body 14, the gasket 44 is formed in a shape in which the 1 st seal portion 45 and the 2 nd seal portion 46 which are made of mutually different materials are joined and connected in a ring shape by the joint portion 47, and the entire outer periphery of the gasket 44 including the joint portion 47 is interposed between the cylinder head 23 and the cylinder head cover 24, so that it is possible to satisfy the function required only by a part of the ring-shaped seal portion between the cylinder head 23 and the cylinder head cover 24 with the small-sized gasket 44 and to avoid an increase in cost.
Further, since the gasket 44 is disposed so that at least a part of the 1 st seal portion 45 made of a material having high heat resistance in the gasket 44 overlaps the exhaust port 33 of the cylinder head 23 in a projection view projected onto a plane orthogonal to the cylinder axis CA, the gasket 44 can be made of the 1 st seal portion 45 and the 2 nd seal portion 46 made of a material having low heat resistance while ensuring heat resistance in the vicinity of the exhaust port 33 having a large thermal influence, thereby reducing the cost of the gasket 44 without making the entire gasket 44 have excessive quality.
Further, since the exhaust device 34 connected to the exhaust port 33 has the catalyst converter 36 in an intermediate portion thereof and at least a part of the 1 st seal portion 45 is disposed facing the catalyst converter 36 side in a projection view projected onto a plane orthogonal to the cylinder axis CA, the 1 st seal portion 45 made of a material having high heat resistance is disposed on the catalyst converter 36 side where the thermal influence is large, so that heat resistance can be ensured, the gasket 44 as a whole is not made to have excessive quality, and the cost of the gasket 44 can be reduced.
In addition, a difference may be generated in the reaction force of the 1 st seal portion 45 and the 2 nd seal portion 46, and in this case, the larger reaction force may be formed thinner than the smaller reaction force, so that the sealability between the cylinder head 23 and the cylinder head cover 24 may be made uniform.
Embodiment 2
Fig. 7 shows a gasket 50 according to embodiment 2 of the present invention, in which a 1 st seal portion 51 and a 2 nd seal portion 52 made of materials having different heat resistance are joined to each other by a joining portion 53, and the joining portion 53 is formed by mixing a material forming the 1 st seal portion 51 and a material forming the 2 nd seal portion 52, and has a substantially rectangular shape and is connected in a ring shape.
By forming the joint portion 53 in this way, the material forming the joint portion 53 is more compatible with the material forming the 1 st seal portion 51 and the 2 nd seal portion 52, and the joint strength of the joint portion 53 can be improved.
Embodiment 3
In order to explain embodiment 3 of the present invention with reference to fig. 8 and 9, first, in fig. 8, a body frame FB of the motorcycle includes a front fork 55 pivotally supporting a front wheel WFB at a front end thereof and a head pipe 57 steerably supporting a steering handle 56 coupled to the front fork 55, and an internal combustion engine EB that generates power to drive a rear wheel WRB is mounted on the body frame FB.
An engine main body 58 of the engine EB is disposed in front of the rear wheels WRB and supported by the vehicle body frame FB. The output of the internal combustion engine EB is transmitted to the rear wheels WRB via a transmission (not shown), the rear wheels WRB are pivotally supported at a rear end portion of a swing arm 60 that is swingably supported by the body frame FB, and a rear cushion unit 61 is provided between the rear end portion of the swing arm 60 and a rear portion of the body frame FB.
The engine main body 58 includes: a crankcase 63 rotatably supporting a crankshaft 62 having an axis extending in the vehicle width direction; a cylinder block 64 combined with the crankcase 63; a cylinder head 65 coupled to the cylinder block 64; and a head cover 66 joined to the cylinder head 65, the cylinder axis CB of the engine main body 58 being inclined upward in the forward direction.
Referring also to fig. 9, an intake device 67 is connected to a rear side wall 65a facing the rear of the cylinder head 65. Further, an exhaust port 68 is provided at a connection portion between a front side wall 65b facing the front and a right side wall 65c facing the right side in the vehicle width direction in the cylinder head 65, and an exhaust device 69 connected to the exhaust port 68 includes: an upstream exhaust pipe 70 connected to the exhaust port 68 and connected to the front side wall 65b and the right side wall 65c of the cylinder head 65; a catalyst converter 71 connected to a downstream end of the upstream exhaust pipe 70; a downstream-side exhaust pipe 72 connected to a downstream end of the catalytic converter 71 and extending rearward; and an exhaust muffler 73 connected to a downstream end of the downstream-side exhaust pipe 72.
The catalytic converter 71 is disposed with its upstream end as an upper end and substantially in the vertical direction in front of the right front end of the crankcase 63. The upstream exhaust pipe 70 extends downward from the exhaust port 68 and is connected to an upstream end of the catalytic converter 71, and the downstream exhaust pipe 72 is connected to a downstream end of the catalytic converter 71 in front of a lower right portion of the crankcase 63 and extends rearward through a lower right portion of the crankcase 63. The exhaust muffler 73 is disposed on the right side of the rear wheel WRB and connected to the downstream end of the downstream exhaust pipe 72, and the upper portion of the exhaust muffler 73 is covered with a heat shield 74. Further, an ignition plug 75 is attached to the right side wall 65c of the cylinder head 65 in the engine main body 58.
However, the gasket 80 of the present invention is interposed between the cylinder head 65 and the cylinder head cover 66, which are the 1 st and 2 nd body components that constitute a part of the engine body 58 and are joined to be adjacent to each other.
In the gasket 80, a plurality of seal portions made of different materials are joined by joint portions and connected in a ring shape, and in the embodiment 2, the gasket 80 is formed by joining a 1 st seal portion 81 and a 2 nd seal portion 82 made of different materials having different heat resistance by a joint portion 83, and having a substantially rectangular shape and connected in a ring shape, and the entire outer periphery of the gasket 80 including the joint portion 83 is sandwiched between the cylinder head 65 and the cylinder head cover 66.
The material forming the 1 st sealing part 81 is a material having high heat resistance, for example, Fluorine (FKM) of vinylidene fluoride type, and the material forming the 2 nd sealing part 82 is a material having lower heat resistance than the material forming the 1 st sealing part 81, for example, acrylate rubber (ACM) or ethylene acrylate rubber (AEM).
As shown in fig. 9, the gasket 80 interposed between the cylinder head 65 and the cylinder head cover 66 is disposed such that at least a part of the 1 st sealing portion 81 made of a material having high heat resistance in the gasket 80 overlaps the exhaust port 68 in a projection view projected onto a plane orthogonal to the cylinder axis CB.
The exhaust device 69 connected to the exhaust port 68 has the catalyst converter 71 in an intermediate portion thereof, and at least a part of the 1 st seal portion 81 is disposed facing the catalyst converter 71 side in a projection view projected onto a plane orthogonal to the cylinder axis CB.
That is, as shown in fig. 9, the 1 st seal part 81 is formed in a substantially U shape so as to occupy a range WB including lower portions of both right and left sides of the washer 80 and lower portions of the washer 80, which are substantially rectangular and connected in a ring shape.
The same effects as those of the above-described embodiment 1 can be obtained by embodiment 3 as well.
While the embodiments of the present invention have been described above, the present invention is not limited to the above embodiments, and various design changes can be made without departing from the gist thereof.
For example, in the above-described embodiment, the sealing structure related to the internal combustion engine mounted on the motorcycle has been described, but the present invention is not limited to the motorcycle, and can be widely applied as the sealing structure of the internal combustion engine mounted on the vehicle.
Claims (6)
1. A seal structure for an internal combustion engine, wherein a gasket (44, 50, 80) is interposed between a 1 st body component (23, 65) and a 2 nd body component (65, 66) that constitute a part of an internal combustion engine body (14, 58) and are joined to each other in an adjacent manner, wherein the gasket (44, 50, 80) is formed by joining and connecting a plurality of seal portions (45, 46; 51, 52; 81, 82) made of different materials to each other in a ring shape by joint portions (47, 53, 83), and wherein the entire outer periphery of the gasket (44, 50, 80) including the joint portions (47, 53, 83) is interposed between the 1 st body component (23, 65) and the 2 nd body component (24, 66).
2. The seal structure for an internal combustion engine according to claim 1, wherein the 1 st main body component is a cylinder head (23, 65) having an exhaust port (33, 68), wherein the gasket (44, 50, 80) formed by joining a pair of the seal portions (45, 51, 81; 46, 52, 82) made of materials having different heat resistance is interposed between a cylinder head cover (24, 66) as the 2 nd main body component and the cylinder head (23, 65), and wherein at least a part of one seal portion (45, 51, 81) made of a material having high heat resistance out of the pair of seal portions (45, 51, 81; 46, 52, 82) is arranged so as to overlap the exhaust port (33, 68) in a projection view onto a plane orthogonal to a cylinder axis (CA, CB).
3. The seal structure of an internal combustion engine according to claim 2, wherein an exhaust device (34, 69) having a catalytic converter (36, 71) is connected to the exhaust port (33, 68), and at least a part of the one seal portion (45, 51, 81) is disposed facing the catalytic converter (36, 71) side on a projection view of a plane orthogonal to the cylinder axis (CA, CB).
4. The seal structure of an internal combustion engine according to any one of claims 1 to 3, wherein the joint portion (47, 83) is formed in a concavo-convex shape in which end portions of a pair of the seal portions (45, 46; 81, 82) adjacent to each other are fitted to each other.
5. The seal structure of an internal combustion engine according to claim 2 or 3, wherein the joint portion (47, 83) is formed by joining a 1 st inclined surface (45c) facing the cylinder head cover (24, 66) and formed in the one seal portion (45, 81) and a 2 nd inclined surface (46c) facing the cylinder head (23, 65) and formed in the other seal portion (46, 82) to each other.
6. The seal structure for an internal combustion engine according to any one of claims 2 to 5, wherein the side of the pair of seal portions (45, 51, 81; 46, 52, 82) having a larger reaction force is formed thinner than the side having a smaller reaction force.
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| PCT/JP2017/047300 WO2019130561A1 (en) | 2017-12-28 | 2017-12-28 | Seal structure for internal combustion engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111566393A true CN111566393A (en) | 2020-08-21 |
| CN111566393B CN111566393B (en) | 2021-12-21 |
Family
ID=67066877
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201780097964.4A Active CN111566393B (en) | 2017-12-28 | 2017-12-28 | Sealing structure for internal combustion engine |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6690069B2 (en) |
| CN (1) | CN111566393B (en) |
| WO (1) | WO2019130561A1 (en) |
Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5779212A (en) * | 1980-11-01 | 1982-05-18 | Honda Motor Co Ltd | Secondary air supplier for exhaust gas purification of internal combustion engine |
| JPS6113062U (en) * | 1984-06-28 | 1986-01-25 | 日産ディーゼル工業株式会社 | gasket |
| JPS61149756U (en) * | 1985-03-07 | 1986-09-16 | ||
| CN1169506A (en) * | 1996-01-12 | 1998-01-07 | 本田技研工业株式会社 | Sealing structure for cylinder and cylinder cover in reciprocating IC engine, and assembling method for same |
| US20020017762A1 (en) * | 2000-08-07 | 2002-02-14 | Ishikawa Gasket Co., Ltd. | Cylinder head gasket with partial seal coating |
| CN202132126U (en) * | 2011-03-24 | 2012-02-01 | 杨兰 | Single layer metal exhaust pipe pad for engine |
| US20140217679A1 (en) * | 2013-02-07 | 2014-08-07 | Interface Solutions, Inc. | Gasket with High Temperature Coating |
| US20150054228A1 (en) * | 2012-03-15 | 2015-02-26 | Uchiyama Manufacturing Corp. | Gasket |
| US20170362986A1 (en) * | 2016-06-20 | 2017-12-21 | Mazda Motor Corporation | Exhaust device of engine |
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| JPS6032342Y2 (en) * | 1980-04-30 | 1985-09-27 | 本田技研工業株式会社 | Exhaust purification device for internal combustion engine |
| JPS628686Y2 (en) * | 1981-01-31 | 1987-02-28 | ||
| JPH0240158U (en) * | 1988-09-10 | 1990-03-19 | ||
| JP2009085290A (en) * | 2007-09-28 | 2009-04-23 | Aisin Chem Co Ltd | Curved surface sealing structure |
| CN102224364B (en) * | 2008-11-25 | 2014-05-07 | Nok株式会社 | Two-material compound gasket |
| DE102009020490B4 (en) * | 2009-05-08 | 2012-07-12 | Federal-Mogul Sealing Systems Gmbh | Sealing element for sealing flange surfaces in internal combustion engines |
| JP6363923B2 (en) * | 2014-09-30 | 2018-07-25 | 株式会社Ｓｕｂａｒｕ | Volatile fuel gasket |
| JP2017032035A (en) * | 2015-07-30 | 2017-02-09 | Ｋｙｂ株式会社 | Seal structure and seal method |
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2017
- 2017-12-28 JP JP2019562689A patent/JP6690069B2/en active Active
- 2017-12-28 CN CN201780097964.4A patent/CN111566393B/en active Active
- 2017-12-28 WO PCT/JP2017/047300 patent/WO2019130561A1/en active Application Filing
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| JPS5779212A (en) * | 1980-11-01 | 1982-05-18 | Honda Motor Co Ltd | Secondary air supplier for exhaust gas purification of internal combustion engine |
| JPS6113062U (en) * | 1984-06-28 | 1986-01-25 | 日産ディーゼル工業株式会社 | gasket |
| JPS61149756U (en) * | 1985-03-07 | 1986-09-16 | ||
| CN1169506A (en) * | 1996-01-12 | 1998-01-07 | 本田技研工业株式会社 | Sealing structure for cylinder and cylinder cover in reciprocating IC engine, and assembling method for same |
| US20020017762A1 (en) * | 2000-08-07 | 2002-02-14 | Ishikawa Gasket Co., Ltd. | Cylinder head gasket with partial seal coating |
| CN202132126U (en) * | 2011-03-24 | 2012-02-01 | 杨兰 | Single layer metal exhaust pipe pad for engine |
| US20150054228A1 (en) * | 2012-03-15 | 2015-02-26 | Uchiyama Manufacturing Corp. | Gasket |
| US20140217679A1 (en) * | 2013-02-07 | 2014-08-07 | Interface Solutions, Inc. | Gasket with High Temperature Coating |
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Also Published As
| Publication number | Publication date |
|---|---|
| WO2019130561A1 (en) | 2019-07-04 |
| JPWO2019130561A1 (en) | 2020-04-02 |
| CN111566393B (en) | 2021-12-21 |
| JP6690069B2 (en) | 2020-04-28 |
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