Saddle-ride type internal combustion engine for vehicle
阅读说明:本技术 鞍乘型车辆用内燃机 (Saddle-ride type internal combustion engine for vehicle ) 是由 高桥一仁 堀井宣孝 于 2019-12-25 设计创作,主要内容包括:本发明提供一种鞍乘型车辆用内燃机,具有容易脱模、确保强度且外观性良好的散热片。在鞍乘型车辆用内燃机(3)中,内燃机结构部件在左、右侧面具有在与气缸轴线(C)正交的左右方向上延伸地与散热片(7)交叉的多个正交肋(8),散热片具有相对于缸轴线正交面(H)的表面倾斜角度(α)较大的基端部(71)侧大角度部(72)、以及表面倾斜角度(β)较小的前端部(73)侧小角度部(74),具有只位于前方最外侧的正交肋和后方最外侧的正交肋之间的侧面散热片部(7a),散热片中的比前、后方最外侧的正交肋更靠外侧的前侧散热片部(7c)和后侧散热片部(7b)以单一的表面倾斜角度(γ)形成。(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.)
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, 34d) 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 internal combustion engine structural member (34) has a plurality of orthogonal ribs (8) on the left and right side surfaces (34C, 34d), 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 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,
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.
2. The internal combustion engine for a saddle-type vehicle according to claim 1,
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).
3. The internal combustion engine for a saddle-type vehicle according to claim 1 or 2,
the end (8a) 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 (7d) of the heat sink (7) in the extending direction.
4. The internal combustion engine for a saddle-ride type vehicle according to any one of claims 1 to 3,
an upper end surface (75) facing upward of the side fin portion (7a) located 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) located at the lowermost end is formed at a single surface inclination angle (theta) with respect to a cylinder axis orthogonal plane (H).
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 (8a) of the orthogonal rib (8) in the extending direction.
6. The internal combustion engine for a saddle-ride type vehicle according to any one of claims 1 to 5,
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).
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
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
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
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
In fig. 2, a pipe provided upward and downward in front of the
In the
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
An intake port 37 and an exhaust port 38 are formed in the rear portion and the front portion of the
As shown in fig. 3, which is a plan view of the
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
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
The cylinder block 33 and the
The
The
On the left and right side surfaces of the
E.g. based on IV in FIG. 31-IV1Fig. 4 (IV), which is a front sectional view of the
In the cross-sectional shape of the
The
In this 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
In the present embodiment, the surface inclination angle θ of the
E.g. based on IV in FIG. 32-IV2Fig. 4 (IV), which is a front sectional view of the
Although the respective surface inclination angles γ of the front
In the present embodiment, γ ═ γ1~γn…=γ1′~γn′…=β=3°、α=5°。
As shown in fig. 4, the
As shown in fig. 5, which is a right side perspective view of the
The characteristic structure and operational effects of the internal combustion engine 3 of the present embodiment described above are as follows.
The
Further, the left and right side surfaces 34C and 34d of the
The
The
Further, of the
In the
As shown by the two-dot chain line in fig. 3, the
The
In the present embodiment, the surface inclination angle γ of
Therefore, the
Further, the
Although the surface area of the range surrounded by the
Further, an upper end face 75 facing upward of the
Therefore, the
The switching portion 77 for switching the surface inclination angles α, β of the
Therefore, since the switching portion 77 of the surface inclination angles α, β of the
The switching portion 77 between the
Therefore, it is difficult to see the switching of the surface inclination angles α and β of the
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
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
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.
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