CN111608784B - Saddle-ride type internal combustion engine for vehicle - Google Patents
Saddle-ride type internal combustion engine for vehicle Download PDFInfo
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- CN111608784B CN111608784B CN201911353739.XA CN201911353739A CN111608784B CN 111608784 B CN111608784 B CN 111608784B CN 201911353739 A CN201911353739 A CN 201911353739A CN 111608784 B CN111608784 B CN 111608784B
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- combustion engine
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/02—Cylinders; Cylinder heads having cooling means
- F02F1/04—Cylinders; Cylinder heads having cooling means for air cooling
- F02F1/06—Shape or arrangement of cooling fins; Finned cylinders
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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
- F02F1/00—Cylinders; Cylinder heads
- F02F1/24—Cylinder heads
- F02F1/26—Cylinder heads having cooling means
- F02F1/28—Cylinder heads having cooling means for air cooling
- F02F1/30—Finned cylinder heads
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
- F01P2001/023—Cooling cylinders
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P1/00—Air cooling
- F01P1/02—Arrangements for cooling cylinders or cylinder heads, e.g. ducting cooling-air from its pressure source to cylinders or along cylinders
- F01P2001/026—Cooling cylinder heads
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
- F01P—COOLING OF MACHINES OR ENGINES IN GENERAL; COOLING OF INTERNAL-COMBUSTION ENGINES
- F01P2050/00—Applications
- F01P2050/16—Motor-cycles
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention provides an internal combustion engine for a saddle-ride type vehicle, which is provided with a radiating fin which is easy to demould, ensures strength and has good appearance. In an internal combustion engine (3) for a saddle-ride type vehicle, the internal combustion engine structural component is provided with a plurality of orthogonal ribs (8) extending in the left-right direction orthogonal to a cylinder axis (C) and intersecting with a cooling fin (7) on the left side and the right side, the cooling fin is provided with a base end part (71) side large-angle part (72) with a larger surface inclination angle (alpha) relative to the cylinder axis orthogonal surface (H) and a front end part (73) side small-angle part (74) with a smaller surface inclination angle (beta), the cooling fin is provided with a side cooling fin part (7a) only positioned between the orthogonal rib on the front outermost side and the orthogonal rib on the rear outermost side, and a front cooling fin part (7C) and a rear cooling fin part (7b) positioned on the outer side of the orthogonal ribs on the front outermost side and the rear side in the cooling fin are formed with a single surface inclination angle (gamma).
Description
Technical Field
The present invention relates to an internal combustion engine for a saddle-ride type vehicle, and more particularly to an air-cooling fin for an internal combustion engine for a saddle-ride type vehicle.
Background
An air-cooling fin cast integrally with an internal combustion engine structural member such as a cylinder head or a cylinder block of a conventional internal combustion engine for a saddle-ride type vehicle has a constant draft angle, as shown in patent document 1 below, for example. Although the draft angle is required to be at least a certain degree from the viewpoint of easiness of mold release, when the draft angle is increased, the impression of a thick fin is generated and a problem in appearance is generated, and when the fin is formed to be thin as a whole, a problem in strength is generated in addition to difficulty of mold release.
Documents of the prior art
Patent document
Patent document 1: japanese laid-open patent publication (JP-A) 2015-175368 (FIGS. 2 and 5)
Disclosure of Invention
Technical problem to be solved by the invention
The present invention has been made in view of the problems of the prior art, and an object of the present invention is to provide a saddle-ride type internal combustion engine for a vehicle, which has a fin for air cooling of an internal combustion engine structural member such as a cylinder head or a cylinder block, and which is thin in appearance, easy to be released from a mold, and capable of securing strength.
Technical solution for solving technical problem
In order to solve the above problems, according to the present invention, there is provided a saddle-ride type internal combustion engine for a vehicle, which has an internal combustion engine structural member extending in a cylinder axial direction from a crankcase,
the internal combustion engine structural member has a plurality of fins that receive traveling wind on left and right side surfaces when mounted on a vehicle, the fins extending in a left-right direction orthogonal to a cylinder axis and being disposed on an outer periphery of the internal combustion engine structural member along a circumferential direction,
the internal combustion engine for a saddle-ride type vehicle is characterized in that,
the internal combustion engine structural member has a plurality of orthogonal ribs on the left and right side surfaces, the orthogonal ribs being arranged in the cylinder axis direction so as to extend in the left-right direction orthogonal to the cylinder axis and intersecting the fins,
the fin is formed in a cross-sectional shape whose thickness decreases in the extending direction, and has a side fin portion formed with a base end side large angle portion having a larger surface inclination angle with respect to the cylinder axis orthogonal surface than the tip end side, and a tip end side small angle portion having a smaller surface inclination angle with respect to the cylinder axis orthogonal surface than the tip end side,
the side fin portion is located only between the orthogonal rib located on the outermost front side and the orthogonal rib located on the outermost rear side of the internal combustion engine structural member when mounted on the vehicle,
the front fin portion and the rear fin portion of the heat sink that are positioned further to the outside than the orthogonal ribs on the outermost front and rear sides are formed so as to have a cross-sectional shape whose thickness decreases with the extending direction at a single surface inclination angle with respect to the cylinder axis orthogonal plane.
According to the saddle-ride type internal combustion engine for a vehicle of the present invention, in the fin of the saddle-ride type internal combustion engine, the tip end portions of the side fin portions of the left and right side surfaces of the engine structural member form the small angle portions having a small surface inclination angle with respect to the plane orthogonal to the cylinder axis, and the front fin portion and the rear fin portion are formed at a single surface inclination angle, so that the tip end portion of the fin looks thin, the parallelism of the plate thickness increases, the level difference of the fin surface is inconspicuous, and the large angle portions of the base end portions of the side fin portions ensure the favorable mold release property at the time of manufacture and the strength of the fin, and improve the external appearance of the fin.
According to a preferred embodiment of the present invention, the front side fin portion and the rear side fin portion have surface inclination angles formed at the same surface inclination angle as the small angle portion of the side fin portion.
Therefore, the front side fin and the rear side fin can form a continuous surface at the same surface inclination angle as the small angle portion of the side fin portion, so that the flow of the traveling wind is improved, and the appearance is improved.
According to a preferred embodiment of the present invention, an end portion of the orthogonal rib in the extending direction is located closer to a base end portion of the heat sink than an end portion of the heat sink in the extending direction.
Although the surface area of the range surrounded by the orthogonal ribs is narrow, the flow rate of the traveling wind flowing in the range surrounded by the orthogonal ribs can be increased by suppressing the protrusion of the end positions of the orthogonal ribs, and the cooling efficiency can be secured to a certain level or more.
According to a preferred embodiment of the present invention, an upper end surface facing upward of the side fin portion located at the uppermost end in the cylinder axis direction, or a lower end surface facing downward of the side fin portion located at the lowermost end, of the side fin portions, is formed at a single surface inclination angle with respect to a cylinder axis orthogonal plane.
Therefore, the surface of the side fin portion is uniform, and the appearance of the internal combustion engine structural member when viewed from above or below in the cylinder axis direction can be improved.
According to a preferred embodiment of the present invention, the switching portion that switches the surface inclination angle of the side fin portion is located closer to the base end portion side of the side fin portion than the end portion in the extending direction of the orthogonal rib.
Therefore, since the switching portion of the surface inclination angle of the side fin portion is located inward, when the internal combustion engine structural member is viewed from the extending direction of the orthogonal rib, the switching portion is difficult to see, and the appearance is improved.
According to a preferred embodiment of the present invention, the switching portion between the large angle portion and the small angle portion is formed by a curved surface continuous with the large angle portion and the small angle portion.
Therefore, it is difficult to visually switch the cross-sectional inclination angle of the side fin portion, and the appearance of the internal combustion engine component is further improved.
Effects of the invention
According to the saddle-ride type internal combustion engine for a vehicle of the present invention, in the fin of the saddle-ride type internal combustion engine, the tip end portion sides of the side fin portions of the left and right side surfaces of the engine structural member form the small angle portions having a small surface inclination angle with respect to the plane orthogonal to the cylinder axis, and the front fin portion and the rear fin portion are formed at a single surface inclination angle, so that the parallelism of the plate thickness of the tip end portion of the fin is increased, the level difference of the fin surface is inconspicuous, and the large angle portion on the base end portion side of the side fin portion is utilized to ensure the favorable mold release and the strength of the fin at the time of manufacture, and improve the appearance of the fin.
Drawings
Fig. 1 is a schematic left side view of a motorcycle according to an embodiment of the present invention.
Fig. 2 is a left side view of the internal combustion engine shown in fig. 1.
Fig. 3 is a top view of the cylinder head, as viewed from III-III in fig. 2.
FIG. 4 is a front cross-sectional view of the cylinder head of FIG. 3, in which (IV)1Section) is based on IV in FIG. 31-IV1Partial front section view of the cylinder head, seen in the figure (IV)2Section) is based on IV in FIG. 32-IV2A partial front section of the cylinder head is seen.
Fig. 5 is a right side perspective view of the cylinder head as viewed in the direction V-V of fig. 3.
Description of the reference numerals
1 motorcycle (a "saddle-ride type vehicle" of the present invention); 2a vehicle body frame; an internal combustion engine (an "internal combustion engine for a saddle-ride type vehicle" according to the present invention); 7, a heat sink; 7a side heat-radiating fin part; 7b rear side fin portion; 7c a front fin portion; 7d end portion; 8 orthogonal ribs; 8a end portion; 30 a crankcase; 31 a crankshaft; a 32 cylinder portion; a cylinder block (an "internal combustion engine structural member" of the invention); 33a cylinder barrel; 34 cylinder heads ("internal combustion engine structural members" of the invention); 34c left side; 34d right side; 35 a cylinder head cover; 36 a combustion chamber; 37 an air inlet; 38 an exhaust port; 41 a piston; 60 valve chambers; 61 a camshaft; 71 base end portion; a 72 wide angle portion; 73 front end portion; a 74 small angle portion; 75 an upper end surface; 76 lower end surface; 77 a switching part; 78 curved surface; c, a cylinder axis; an X crankshaft axis; h, an orthogonal plane of the cylinder axis; α, β, γ, θ are inclined at an angle relative to the surface of the cylinder axis orthogonal plane H.
Detailed Description
An internal combustion engine for a saddle-ride type vehicle according to an embodiment of the present invention will be described with reference to fig. 1 to 5.
The directions of the front, rear, left, right, up, down, and the like in the description and claims of the present specification follow the direction of the saddle-ride type vehicle on which the internal combustion engine for a saddle-ride type vehicle according to the present embodiment is mounted. In the present embodiment, the saddle type vehicle is a motorcycle.
In the drawings, arrow FR indicates the vehicle front side, LH indicates the vehicle left side, RH indicates the vehicle right side, and UP indicates the vehicle upper side of the saddle-ride type vehicle according to the present embodiment.
Fig. 1 is a schematic left side view of a motorcycle (a "saddle-ride type vehicle" according to the present invention) 1 according to an embodiment of the present invention.
The main frame 21 of the body frame 2 of the motorcycle 1 of the present embodiment extends rearward from the head pipe 20 so as to be covered with the fuel tank 16 from above, extends slightly inclined downward, and then bends downward to form a pivot frame 21 a. The lower frame 22 extends further obliquely rearward and downward from the head pipe 20 at the vehicle width direction center.
The front portion of the crankcase 30 of the internal combustion engine (the "saddle-ride type internal combustion engine for a vehicle" according to the present invention) 3 is attached to the support bracket 22a at the lower portion of the lower frame 22, and the rear portion of the crankcase 30 is attached to the pivot frame 21a, whereby the internal combustion engine 3 is supported by the vehicle body frame 2.
A pair of left and right seat rails 23 extend rearward from the main frame 21, and a back stay 24 that connects the seat rails 23 and the pivot frame 21a supports the seat rails 23.
A front fork 10 is pivotally supported on the head pipe 20, a front wheel 11 is pivotally supported on a lower end of the front fork 10, and a steering handle 12 is provided on an upper end of the pivot of the front fork 10.
A swing arm 13 having a front end shaft supported by a pivot shaft 25 provided at a lower portion of the pivot frame 21a extends rearward, a rear wheel 14 is supported by a rear end shaft of the swing arm 13, and a rear shock absorber, not shown, is mounted between the swing arm 13 and the rear stay 24.
A fuel tank 16 is mounted on the main frame 21 so as to extend across the left and right sides, and a seat 17 is supported and provided on a seat rail 23 at the rear of the fuel tank 16.
As shown in fig. 2, which is a left side view of the internal combustion engine 3 shown in fig. 1, the internal combustion engine 3 of the present embodiment is an air-cooled single-cylinder SOHC four-stroke cycle internal combustion engine, and a so-called power unit is configured by integrally providing a multi-stage transmission 5 at a rear portion in a crankcase 30 of the internal combustion engine, and is mounted on the motorcycle 1 in a posture in which a crankshaft axis X of a crankshaft 31 of the internal combustion engine is directed in a vehicle width direction of the motorcycle 1, that is, in a left-right direction, and a cylinder portion 32 is slightly tilted upward.
An output sprocket, not shown, is mounted to an output shaft 5a of the multi-stage transmission 5 that penetrates a rear left side surface of the crankcase 30 and serves as an output shaft of the power unit, and a drive chain 15 wound around the output sprocket is mounted to a driven sprocket 14a on the rear wheel 14 side (see fig. 1) to transmit power to the rear wheel 14.
A chain cover 18 is attached to the left side surface of the rear portion of the crankcase 30 to cover the output sprocket from the outside, thereby improving safety and appearance.
The internal combustion engine 3 is configured such that a cylinder block (an "internal combustion engine structural member" of the present invention) 33 and a cylinder head (an "internal combustion engine structural member" of the present invention) 34 are stacked in this order obliquely above a crankcase 30, and are integrally fastened by a stud bolt 39a inserted through a stud bolt insertion hole 39 (see fig. 3), and a cylinder head cover 35 is covered above the cylinder head 34, and the cylinder block 33, the cylinder head 34, and the cylinder head cover 35 constitute a cylinder portion 32, and the cylinder portion 32 is provided so as to tilt a cylinder axis C, which is a central axis of a cylinder tube 33a formed in the cylinder block 33, and to project slightly forward from the crankcase 30. That is, the internal combustion engine 3 has a cylinder block 33 and a cylinder head 34 as engine structural members extending from the crankcase 30 in the direction of the cylinder axis C.
In fig. 2, a pipe provided upward and downward in front of the cylinder portion 32 serves as an oil pipe 40 for cooling, and an end portion of at least one of the plurality of fins 33b provided in the cylinder block 33 extends outward of the oil pipe 40 in the cylinder radial direction, thereby protecting the oil pipe 40.
In the cylinder portion 32, a piston 41 is slidably fitted into a cylinder bore 33a of the cylinder block 33, and a combustion chamber 36 is formed between the top of the piston 41 and the cylinder head 34.
The mixture of the fuel and the external air is combusted in the combustion chamber 36, and the piston 41 reciprocates in the cylinder bore 33a, and the reciprocation is converted into a rotational motion of the crankshaft 31 via a connecting rod, not shown.
A throttle body 53, which is a component 51 of an intake system, is connected to the rear side of the cylinder portion 32 via an intake pipe 52, a throttle valve, not shown, is provided in the throttle body 53, and a fuel injection valve 54 is provided in the intake pipe 52. An exhaust pipe 57, which is a component 56 of an exhaust system, is connected to the front side of the cylinder portion 32, and the exhaust pipe 57 extends rearward on the right side of the lower portion of the vehicle and is connected to a muffler (not shown) provided on the right side portion of the vehicle (see fig. 1).
An intake port 37 and an exhaust port 38 are formed in the rear portion and the front portion of the cylinder head 34, respectively, and are opened and closed by an intake valve and an exhaust valve, not shown.
As shown in fig. 3, which is a plan view of the cylinder head 34 viewed from III-III in fig. 2, a valve chamber 60 is defined in the cylinder head 33, a camshaft 61 having a camshaft axis Y parallel to the crankshaft axis X is disposed, and a valve mechanism having a camshaft 61 for both intake and exhaust including an intake cam and an exhaust cam is supported.
A cam chain chamber 65, which houses a cam chain, not shown, for transmitting power of the crankshaft 31 to the valve train and communicates the inside of the crankcase 30 and the inside of the cylinder head 34, is disposed on one side of the cylinder portion 32, and the camshaft 61 is driven in association with the crankshaft 31 by the cam chain, and opens and closes the intake valve and the exhaust valve at predetermined timings by the intake cam and the exhaust cam.
In the present embodiment, a cylinder head front opening 38a of the exhaust port 38 is provided in the front wall portion 34a of the cylinder head 34, and a cylinder head rear opening 37a of the intake port 37 is provided in the rear wall portion 34 b.
The cylinder block 33 and the cylinder head 34 have a plurality of fins 7 for receiving traveling wind on the left and right sides when mounted on the vehicle for air cooling.
The fins 7 extend in the left-right direction orthogonal to the cylinder axis C, and are arranged along the circumferential direction on the outer peripheries of the cylinder block 33 and the cylinder head 34.
The cylinder head 34 includes a plurality of orthogonal ribs 8 which are arranged substantially in the cylinder axis C direction so as to extend in the same extending direction as the fins 7, that is, in the right-left direction orthogonal to the cylinder axis C from the left side surface and the right side surface when mounted on the vehicle, and intersect the fins 7 substantially orthogonally.
On the left and right side surfaces of the cylinder head 34, side fin portions 7a are formed in the fins 7 of the cylinder head 34 between the orthogonal rib 8 located on the outermost front side and the orthogonal rib 8 located on the outermost rear side of the cylinder head 34 when mounted on the vehicle.
E.g. based on IV in FIG. 31-IV1Fig. 4 (IV), which is a front sectional view of the cylinder head 34 as viewed1Portion), the side fin portion 7a is formed in a cross-sectional shape whose thickness decreases as it extends in the extending direction, i.e., the vehicle width direction.
In the cross-sectional shape of the side fin portion 7a in the extending direction, there are formed: a base end portion 71 side large angle portion 72 having a surface inclination angle α with respect to the cylinder axis orthogonal surface H larger than the side of the tip end portion 73, and a tip end portion 73 side small angle portion 74 having a surface inclination angle β with respect to the cylinder axis orthogonal surface H smaller than the side of the base end portion 71.
CylinderThe side fin portion 7a of the cover 34 is provided with a plurality of layers, seven layers in the present embodiment, on one side, and as long as α > β is provided on the surface of each side fin portion 7a facing in the cylinder axis C direction, each surface is inclined at an angle α: alpha is alpha1～αn… may also be different. Inclination angle β of each surface: beta is a1～βn… may also be different.
In the present embodiment, α ═ α1～αn…＝5°、β＝β1～βn…＝3°。
In addition, as shown In (IV) of FIG. 41As shown in section), an upward facing upper end face 75 of the side fin portion 7a positioned at the uppermost end in the cylinder axis C direction and a downward facing lower end face 76 of the side fin portion 7a positioned at the lowermost end are formed by a single surface inclination angle θ with respect to the cylinder axis orthogonal plane H.
In the present embodiment, the surface inclination angle θ of the upper end face 75 may be different from the surface inclination angle θ 2 of the lower end face 76, but is preferably small, and for example, is preferably not more than the surface inclination angle β of the small-angle portion 74 of the side fin portion 7 a.
E.g. based on IV in FIG. 32-IV2Fig. 4 (IV), which is a front sectional view of the cylinder head 34 as viewed2Portion), among the fins 7, a rear fin portion 7b located on the outer side of the rear outermost orthogonal rib 8, that is, on the rear side, and a front fin portion 7c located on the outer side of the front outermost orthogonal rib 8, that is, on the front side, are formed so as to have a cross-sectional shape whose thickness decreases with a single surface inclination angle γ with respect to the cylinder axis orthogonal plane H as extending in the extending direction, that is, in the vehicle width direction.
Although the respective surface inclination angles γ of the front side fin portions 7 c: gamma ray1～γn… and rear fin portion 7b, respectively, have surface inclination angles γ: gamma ray1′～γn' … may be different, but a small angle is preferable, and for example, the surface inclination angle β of the small-angle portion 74 of the side fin portion 7a is preferably around.
In the present embodiment, it is preferred that,γ＝γ1～γn…＝γ1′～γn′…＝β＝3°、α＝5°。
as shown in fig. 4, the end 8a of the orthogonal rib 8 in the extending direction is located closer to the base end 71 of the heat sink 7 than the end 7d of the heat sink 7 in the extending direction.
As shown in fig. 5, which is a right side perspective view of the cylinder head 34 viewed in the V-V direction in fig. 3, and fig. 4, in the present embodiment, the switching portion 77 that switches the surface inclination angle α of the large angle portion 72 and the surface inclination angle β of the small angle portion 74 of the side fin portion 7a is located closer to the base end portion 71 side of the side fin portion 7a than the end portion 8a in the extending direction of the orthogonal rib 8 (see the position indicated by the small circle in fig. 4). The switching portion 77 between the large angle portion 72 and the small angle portion 74 is formed by a curved surface 78 continuous with the large angle portion 72 and the small angle portion 74, and the switching portion 77 is inconspicuous.
The characteristic structure and operational effects of the internal combustion engine 3 of the present embodiment described above are as follows.
The cylinder head 34 has a plurality of fins 7 that receive traveling wind on left and right side surfaces 34C, 34d when mounted on the vehicle, and the fins 7 extend in the left-right direction orthogonal to the cylinder axis C and are arranged along the circumferential direction on the outer periphery of the cylinder head 34.
Further, the left and right side surfaces 34C and 34d of the cylinder head 34 have a plurality of orthogonal ribs 8, and these orthogonal ribs 8 are arranged in the cylinder axis C direction so as to extend in the left-right direction orthogonal to the cylinder axis C and intersect the fins 7.
The fin 7 has a cross-sectional shape in which the thickness decreases in the extending direction, and has a side fin portion 7a, and the side fin portion 7a has: a base end portion 71 side large angle portion 72 having a surface inclination angle α with respect to the cylinder axis orthogonal surface H larger than the side of the tip end portion 73, and a tip end portion 73 side small angle portion 74 having a surface inclination angle β with respect to the cylinder axis orthogonal surface H smaller than the side of the base end portion 71.
The side fin portion 7a is located only between the orthogonal rib 8 located on the outermost front side and the orthogonal rib 8 located on the outermost rear side of the cylinder head 34 when mounted on the vehicle.
Further, of the fins 7, the front fin portion 7c and the rear fin portion 7b located on the outer side of the front and rear outermost orthogonal ribs 8 are formed in a cross-sectional shape whose thickness decreases in the extending direction at a single surface inclination angle γ with respect to the cylinder axis orthogonal plane H.
In the fin 7 of the internal combustion engine 3, the small angle portion 74 having a small surface inclination angle β with respect to the cylinder axis orthogonal plane H is formed on the front end portion 73 side of the side fin portion 7a of the left and right side surfaces 34c, 34d of the cylinder head 34, and the front fin portion 7c and the rear fin portion 7b are formed at a single surface inclination angle γ, so that the plate thickness of the fin 7 is seen thin, the parallelism of the plate thickness of the front end portion of the fin 7 is increased, the height difference of the surface of the fin 7 is not conspicuous, and the large angle portion 72 on the base end portion 71 side of the side fin portion 7a ensures the favorable mold release at the time of manufacture and the strength of the fin 7, and improves the appearance of the fin 7.
As shown by the two-dot chain line in fig. 3, the cylinder head 34 is cast by the front mold M1, the left mold M2, the right mold M3, and the rear mold M4 during casting, and is drawn in four directions, i.e., front, rear, left, and right, as shown by the two-dot chain line arrows in the drawing.
The fins 7 and the orthogonal ribs 8 on the left and right side surfaces 34c and 34d of the cylinder head 34 are formed in cross-sectional shapes whose thicknesses decrease in the extending direction, and do not hinder the die drawing. In particular, since the side fin portion 7a is formed of the large-angle portion 72 on the base end portion 71 side and the small-angle portion 74 on the tip end portion 73 side, the mold release property, the strength of the fin 7, and the appearance are satisfied at the same time.
In the present embodiment, the surface inclination angle γ of front fin portion 7c and rear fin portion 7b is formed by the same surface inclination angle β as small-angle portion 74 of side fin portion 7 a.
Therefore, the front fin 7c and the rear fin 7b form a continuous surface at the same surface inclination angle γ β as the small-angle portion 74 of the side fin portion 7a, and the flow of the traveling wind is improved, and the appearance is also improved.
Further, the end 8a of the orthogonal rib 8 in the extending direction is located closer to the base end 71 of the fin 7 than the end 7d of the fin 7 in the extending direction.
Although the surface area of the range surrounded by the orthogonal rib 8 is narrow, the amount of flow flowing in the range surrounded by the orthogonal rib 8 in the traveling wind direction can be increased by suppressing the protrusion of the position of the end 8a of the orthogonal rib 8, and cooling efficiency of a certain level or more can be ensured.
Further, an upper end face 75 facing upward of the side fin portion 7a positioned at the uppermost end in the cylinder axis C direction in the side fin portion 7a, or a lower end face 76 facing downward of the side fin portion 7a positioned at the lowermost end is formed at a single surface inclination angle θ with respect to the cylinder axis orthogonal plane H.
Therefore, the upper end surface 75 or the lower end surface 76 of the side fin portion 7a has a uniform surface, and the appearance of the cylinder head 34 when viewed from above or below in the cylinder axis C direction is improved.
The switching portion 77 for switching the surface inclination angles α, β of the side fin portion 7a is located closer to the base end portion 71 of the side fin portion 7a than the end portion 8a in the extending direction of the orthogonal rib 8.
Therefore, since the switching portion 77 of the surface inclination angles α, β of the side fin portion 7a is located inside, when the cylinder head 34 is viewed from the extending direction of the orthogonal rib 8, the switching portion 77 is hard to see, and the appearance is improved.
The switching portion 77 between the large angle portion 72 and the small angle portion 74 of the side heat dissipation fin portion 7a is formed by a curved surface 78 continuous with the large angle portion 72 and the small angle portion 74.
Therefore, it is difficult to see the switching of the surface inclination angles α and β of the side fin portions 7a, and the appearance of the cylinder head 34 is further improved.
As described above, in the above-described embodiment which is an embodiment of the present invention, the example in which the structure of the present invention is applied to the cylinder head 34 is shown as the "engine structural member" of the present invention, but the structure of the present invention may be applied to the cylinder block 33 which is the "engine structural member", or may be applied to the cylinder head 34 and the cylinder block 33 in combination as the embodiment of the present invention.
It is needless to say that various modifications can be made to the above embodiment within the scope of the present invention.
In particular, in the above-described embodiment, the cylinder head 34 and the cylinder block 33 are shown as the "internal combustion engine structural member extending in the cylinder axis direction from the crankcase" in which the cylinder axis C is provided so as to project slightly forward from the crankcase 30 in the direction when mounted on the vehicle, but the present invention also encompasses a case in which the cylinder axis C is provided so as to project slightly backward from the crankcase 30 in the direction when mounted on the vehicle, or a case in which the cylinder axis C is provided so as to project forward from the crankcase 30 in the direction when mounted on the vehicle so as to approach substantially horizontally. In this case, "upper" of the cylinder head or the cylinder block as the internal combustion engine structural member is a direction away from the crankcase, "lower" is a direction toward the crankcase, and "front" and "rear" are sides facing at least forward and rearward, regardless of the inclination of the cylinder axis line C in the direction when mounted on the vehicle.
The "saddle-ride type vehicle" is not limited to the motorcycle of the present embodiment, and includes various saddle-ride type vehicles such as a three-wheeled motor vehicle, a two-wheeled motorcycle, and a three-wheeled all terrain vehicle.
For convenience of explanation, the above embodiment has been described based on the configuration of the left-right arrangement shown in the above embodiment, but embodiments having a left-right arrangement different from that of the above embodiment are also included in the present invention.
Claims (6)
1. An internal combustion engine for a saddle-ride type vehicle, in an internal combustion engine (3) for a saddle-ride type vehicle,
having structural components (33, 34) of the internal combustion engine extending from a crankcase (30) in the direction of a cylinder axis (C),
the internal combustion engine structural member (34) has a plurality of fins (7) that receive traveling wind on left and right side surfaces (34C, 34 d) when mounted on the vehicle, the fins (7) extending in a left-right direction orthogonal to a cylinder axis (C) and being disposed along a circumferential direction on an outer periphery of the internal combustion engine structural member (34),
the internal combustion engine for a saddle-ride type vehicle is characterized in that,
the heat sink (7) is formed in a cross-sectional shape whose thickness decreases with the extending direction, and has a side heat sink portion (7a), the side heat sink portion (7a) is formed with a base end portion (71) side large angle portion (72) having a larger surface inclination angle (alpha) with respect to the cylinder axis orthogonal surface (H) than the tip end portion (73) side, and a tip end portion (73) side small angle portion (74) having a smaller surface inclination angle (beta) with respect to the cylinder axis orthogonal surface (H) than the base end portion (71) side,
an upper end surface (75) facing upward of the side fin portion (7a) positioned at the uppermost end in the cylinder axis (C) direction among the side fin portions (7a), or a lower end surface (76) facing downward of the side fin portion (7a) positioned at the lowermost end is formed at a single surface inclination angle (theta) with respect to a cylinder axis orthogonal plane (H).
2. The internal combustion engine for a saddle-type vehicle according to claim 1,
the internal combustion engine structural member (34) has a plurality of orthogonal ribs (8) on the left and right side surfaces (34C, 34 d), the orthogonal ribs (8) being arranged in the cylinder axis (C) direction so as to extend in the left-right direction orthogonal to the cylinder axis (C) and intersecting the heat dissipation fins (7),
the side fin part (7a) is located only between the orthogonal rib (8) located on the outermost front side and the orthogonal rib (8) located on the outermost rear side of the internal combustion engine structural member (34) when mounted on the vehicle,
among the fins (7), a front fin part (7c) and a rear fin part (7b) which are positioned on the outer side of the orthogonal ribs (8) on the outermost sides of the front and rear sides are formed so as to have cross-sectional shapes whose thicknesses are reduced by a single surface inclination angle (gamma) with respect to a cylinder axis orthogonal plane (H) along the extending direction.
3. The internal combustion engine for a saddle-ride type vehicle according to claim 2,
the front fin portion (7c) and the rear fin portion (7b) have surface inclination angles (γ) formed at the same surface inclination angle (β) as the small-angle portion (74) of the side fin portion (7 a).
4. The internal combustion engine for a saddle-ride type vehicle according to claim 2,
the end (8 a) of the orthogonal rib (8) in the extending direction is positioned closer to the base end (71) of the heat sink (7) than the end (7 d) of the heat sink (7) in the extending direction.
5. The internal combustion engine for a saddle-type vehicle according to claim 1,
a switching part (77) for switching the surface inclination angles (alpha, beta) of the side heat radiating fin part (7a) is positioned closer to the base end part (71) side of the side heat radiating fin part (7a) than the end part (8 a) orthogonal to the extending direction of the rib (8).
6. The internal combustion engine for a saddle-type vehicle according to claim 1 or 2,
the switching section (77) between the large-angle section (72) and the small-angle section (74) is formed by a curved surface (78) continuous with the large-angle section (72) and the small-angle section (74).
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2019033243A JP6795641B2 (en) | 2019-02-26 | 2019-02-26 | Internal combustion engine for saddle-type vehicles |
| JP2019-033243 | 2019-02-26 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN111608784A CN111608784A (en) | 2020-09-01 |
| CN111608784B true CN111608784B (en) | 2022-03-01 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911353739.XA Active CN111608784B (en) | 2019-02-26 | 2019-12-25 | Saddle-ride type internal combustion engine for vehicle |
Country Status (3)
| Country | Link |
|---|---|
| JP (1) | JP6795641B2 (en) |
| CN (1) | CN111608784B (en) |
| BR (1) | BR102020001798A2 (en) |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49100428A (en) * | 1973-01-31 | 1974-09-24 | ||
| JPH0341117U (en) * | 1989-08-28 | 1991-04-19 | ||
| JP2011196322A (en) * | 2010-03-23 | 2011-10-06 | Honda Motor Co Ltd | Ignition plug cooling device in engine |
| JP2013072383A (en) * | 2011-09-28 | 2013-04-22 | Honda Motor Co Ltd | Internal combustion engine |
| CN103711560A (en) * | 2012-10-01 | 2014-04-09 | 雅马哈发动机株式会社 | Air-cooling type internal combustion engine and saddled vehicle having the same |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH087070Y2 (en) * | 1988-03-08 | 1996-02-28 | スズキ株式会社 | Air-cooled engine cooling fin structure |
| JP6263362B2 (en) * | 2013-10-28 | 2018-01-17 | 株式会社マキタ | Cylinder block, engine using this cylinder block, and method of forming cylinder block |
| US9617951B2 (en) * | 2014-05-06 | 2017-04-11 | Champion Engine Technology, LLC | Air flow guide for an internal combustion engine |
-
2019
- 2019-02-26 JP JP2019033243A patent/JP6795641B2/en active Active
- 2019-12-25 CN CN201911353739.XA patent/CN111608784B/en active Active
-
2020
- 2020-01-28 BR BR102020001798-5A patent/BR102020001798A2/en unknown
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS49100428A (en) * | 1973-01-31 | 1974-09-24 | ||
| JPH0341117U (en) * | 1989-08-28 | 1991-04-19 | ||
| JP2011196322A (en) * | 2010-03-23 | 2011-10-06 | Honda Motor Co Ltd | Ignition plug cooling device in engine |
| JP2013072383A (en) * | 2011-09-28 | 2013-04-22 | Honda Motor Co Ltd | Internal combustion engine |
| CN103711560A (en) * | 2012-10-01 | 2014-04-09 | 雅马哈发动机株式会社 | Air-cooling type internal combustion engine and saddled vehicle having the same |
Also Published As
| Publication number | Publication date |
|---|---|
| BR102020001798A2 (en) | 2020-09-29 |
| JP2020139417A (en) | 2020-09-03 |
| JP6795641B2 (en) | 2020-12-02 |
| CN111608784A (en) | 2020-09-01 |
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