CN105889126B - The cooling fan structure of internal combustion engine - Google Patents

The cooling fan structure of internal combustion engine Download PDF

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Publication number
CN105889126B
CN105889126B CN201610080579.6A CN201610080579A CN105889126B CN 105889126 B CN105889126 B CN 105889126B CN 201610080579 A CN201610080579 A CN 201610080579A CN 105889126 B CN105889126 B CN 105889126B
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China
Prior art keywords
cooling fan
rotating vane
air
step height
crankshaft
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CN201610080579.6A
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CN105889126A (en
Inventor
森正树
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Suzuki Motor Corp
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Suzuki Motor Corp
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/30—Vanes
    • 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
    • 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
    • F01P5/00—Pumping cooling-air or liquid coolants
    • F01P5/02—Pumping cooling-air; Arrangements of cooling-air pumps, e.g. fans or blowers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
    • F04D—NON-POSITIVE-DISPLACEMENT PUMPS
    • F04D29/00—Details, component parts, or accessories
    • F04D29/26—Rotors specially for elastic fluids
    • F04D29/28—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps
    • F04D29/281—Rotors specially for elastic fluids for centrifugal or helico-centrifugal pumps for radial-flow or helico-centrifugal pumps for fans or blowers

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Structures Of Non-Positive Displacement Pumps (AREA)

Abstract

The present invention provides one kind and can either be simply formed, and can effectively improve the cooling fan structure of the internal combustion engine of fan efficiency.It is with cooling fan (17), the cooling fan (17) by engine crankshaft power drive, cooling fan (17) is configured at the receiving portion (36) of motor body, and there is the rotating vane (24) rotated in the shaft end portion of crankshaft, the gap (g) between rotating vane (24) and the motor body of formation receiving portion (36) is formed as more that the gap is bigger towards engine central side.

Description

The cooling fan structure of internal combustion engine
Technical field
The present invention relates to the engines of the vehicles such as motorcycle, more particularly to suitable for the internal combustion engine of forced air-cooled engine Cooling fan structure.
Background technique
In the internal combustion engine being equipped on motorcycles such as so-called scooter etc., has and cover its radiating part i.e. gas using shield Cooling wind is imported in shield using the cooling fan in the shaft end portion for being set to crankshaft, the cooling wind is made to blow to gas by cylinder and cylinder head Cooling structure around cylinder cap.Headed by the motorcycle of this example, including household appliances etc. including various centrifugal cooling is installed The cooling device of the forced air cooling type of fan.
Such as in the device recorded in patent document 1, in the crankshaft for being installed on internal combustion engine, and it is corresponding with the revolving speed of variation Ground is generated using impeller in the Centrifugal Cooling Fan of cooling wind, is erected on face, is vertically equipped with by multiple blades in the blade of impeller The blade group of composition has a variety of from impeller mounting surface to the height of each blade tip.
Existing technical literature
Patent document
Patent document 1: No. 5215962 bulletins of Japanese Patent No.
The invention technical task to be solved
In the cooling device of existing vehicle, cylinder head week is cooled down using the cooling wind imported in shield by cooling fan It encloses, and air supply efficiency of cooling fan etc. can significantly affect fuel economy etc. due to the relationship of itself and driving energy etc., It therefore is extremely important factor.In the past, especially because relationship with the shape of cooling fan itself, is not examined substantially Consider the efficiency of cooling fan, status is to stay in the rotary wings of cooling fan or the exit angle of rotating vane or blade The adjusting etc. of height.
In addition, having multiple blades in the cooling fan of patent document 1, but its blade itself is not carried out special Design about shape etc..In addition, since blade number is more, make that structure is complicated, this influences whether air supply efficiency etc..
Summary of the invention
The present invention makes in view of the foregoing, it is intended that it is simple and can effectively improve to provide a kind of structure The cooling fan structure of the internal combustion engine of fan efficiency.
For solving the technical solution of technical task
The cooling fan structure of internal combustion engine of the invention have cooling fan, the cooling fan by engine crankshaft power Driving, which is characterized in that the cooling fan is configured at the receiving portion of motor body, and has around being coaxially set in institute The rotating vane of the rotary shaft rotation in the shaft end portion of crankshaft is stated, the cooling fan is from the rotary shaft, with the crankshaft The tip side of the opposite side in shaft end portion sucks air, and to after discharge air on the outside of radial direction, makes air along the rotation The direction of shaft flows to the crankshaft side, between the rotating vane and the motor body for forming the receiving portion between Gap is formed as more that the gap becomes bigger towards engine central side, and lateral margin and institute in the radial direction of the rotating vane The radial direction lateral border for stating rotating vane, which is compared, to be located on front side of direction of rotation, using the rotation of the rotating vane from air The air of inlet opening part sucking becomes the air stream from upstream towards downstream, and flows into the gap, the rotating vane The rear end side of direction of rotation is provided with multiple step height parts and is formed as step-like, and multiple step height part forms institute The gap between rotating vane and the motor body is stated, is formed with rib in the suction side of the rotating vane, the rib The poor big position of step height between the adjacent step height component of the step height part.
In addition, in the cooling fan structure of internal combustion engine of the invention, which is characterized in that the step-like step height Be partly arranged at the outer peripheral edge than the base portion of the cooling fan closer to outside position.
Invention effect
According to the present invention, actually only pass through the shape of change rotating vane, it will be able to fan efficiency is effectively improved, it can Simplification and lightweight of realization device etc..
Detailed description of the invention
Fig. 1 is the integrally-built side view for indicating motorcycle of the invention.
Fig. 2 is the front stereogram for indicating the structural example of power unit of motorcycle of the invention.
Fig. 3 is the right side view for indicating the structural example of power unit of motorcycle of the invention.
Fig. 4 is the flat cutting view for indicating the structural example of power unit of motorcycle of the invention.
Fig. 5 is the right perspective view of the cooling fan of the cooling fan structure of internal combustion engine of the invention.
Fig. 6 is the left perspective view of the cooling fan of the cooling fan structure of internal combustion engine of the invention.
Fig. 7 is the left side main view of the cooling fan of the cooling fan structure of internal combustion engine of the invention.
Fig. 8 is the front stereogram for the state for indicating that the shield by the power unit of motorcycle of the invention disassembles.
Fig. 9 A is the side view of the cooling fan of the cooling fan structure of internal combustion engine of the invention.
Fig. 9 B is the portion the C enlarged drawing of Fig. 9 A.
Figure 10 A is the flat cutting view for indicating the effect of the cooling fan of cooling fan structure of internal combustion engine of the invention.
Figure 10 B is the portion the D enlarged drawing of Figure 10 A.
Symbol description
10 power units, 11 engines, 12 crankshafts, 13 crankcases, 14 cylinders, 15 cylinder head, 16 valve mechanism cover, 17 centrifugations Formula cooling fan, 18 shields, 19 actuating units, 20 shells, 21 air inlets, 23 cooling blades, 24 rotating vanes, 25 exchanges Generator, 26 rotary shafts, 27 base portions, 28 reinforcement annular portions, 29 installation protrusions, 30 opening portions, 31 arc sections, 32 ribs, 33 Recess portion, 34 side walls, 35 motor bodies, 36 receiving portions, 36a inner peripheral surface, 37,37A-37D step height part, 100 vehicles, g, g1-g4Gap.
Specific embodiment
Hereinafter, being described with reference to the preferred embodiment of the cooling fan structure of internal combustion engine of the invention.
Fig. 1 is the side view as the motorcycle of vehicle of the invention.Firstly, illustrating the whole knot of motorcycle referring to Fig.1 Structure.In addition, in the figure used in following explanation, as needed, arrow Fr being utilized to indicate the front of vehicle including Fig. 1, being utilized Arrow Rr indicates the rear of vehicle, in addition, benefit is indicated by the arrow R on the right side of the side of vehicle, the side of vehicle is indicated by the arrow L in benefit Left side.
Vehicle 100 is installed various using body frame is formed by steel or multiple vehicle frames made of aluminum alloy on vehicle frame Component and constitute.Omission is specifically illustrating, and the front end of the down tube of a part as vehicle frame is in conjunction with steering head tube, from steering head tube To extending approximately below, it is connect near its lower end with lower frame 101.The lower frame 101 extends to substantially rear.In lower frame The rear portion side of frame 101 is combined with the pair of right and left afterframe 102 of a part as vehicle frame, a pair of afterframe 102 respectively to Substantially back upper place inclination extends.
In addition, turning to head tube can turn to the left and right to front fork 103 is rotatably supported in being fixedly arranged above for front fork 103 Front-wheel 105 can be rotatably supported with to handle 104, and in lower end side.Equipped with being rotated integrally with it on the front-wheel 105 Brake disc 106.
Also, it sets up to be formed in the rear end of lower frame 101 and exist for supporting including engine 11 (referring in particular to Fig. 2 etc.) The bracket of interior power unit 10 can be to upper and lower around swinging axle 108 via the supporting member 107 being located on the bracket Direction has been supported swingingly swing type power unit 10.In addition, power unit 10 is by the aftermentioned cylinder assembly of engine 11, interior It is equipped with the component of the actuating unit blocking for the stepless transmission being made of crankcase and band/belt wheel, in the vehicle front Side can swingingly be linked with supporting member 107, vehicle rear side being capable of rotatably supporting wheels using actuating unit 109.Linked between the axle side and afterframe 102 of rear-wheel 109 using damper 110, power unit 10 is whole to be sent out as swing arm The effect of waving.
In addition, the top of power unit 10 shown in Fig. 1 is provided with the seat 111 taken for driver, in lower frame 101 Top, the pedal 112 that the driver for riding on seat 111 puts foot is supported in footrest frame.In addition, pedal 112 and structure It is integrally formed at the crossing frame cover 113 of vehicle appearance.In addition, having between power unit 10 and seat 111 and being configured to benefit The luggage case in the space of the storage article being opened and closed with seat 111 etc..
As vehicle appearance, various body covers are supported on the suitable positions such as vehicle frame and cover.Preceding legging baffle 114 covers vehicle Front side, and blinker is installed etc., link with above-mentioned 112 one of pedal.Afterframe cover 115 covers seat 111 Lower section to vehicle rear side, and blinker, brake lamp are installed.The top of front-wheel 105 and rear-wheel 109 is respectively by preceding Mud guard 116 and rear mudguard 117 cover.
Next, illustrating power unit 10 referring to Fig. 2-Fig. 4 etc..Fig. 2 is the front stereogram of power unit 10, and Fig. 3 is The right side view for the state that shield is disassembled, Fig. 4 are flat cutting views.In the basic structure of power unit 10, there is sky Cold type four recycles single-cylinder engine 11, the engine 11 in this example, for example, SOHC engine.In engine 11, crankshaft Case 13 rotatably freely supports, stores the crankshaft 12 (simply indicating in Fig. 2 using single dotted broken line) of horizontal arrangement in left-right direction, It is successively combined with cylinder 14, cylinder head 15 and valve mechanism cover 16 in front and crankcase 13 relative to crankcase 13, the cylinder Axis Z is set in a generally horizontal direction.In this case, the gas of cylinder 14 is made in a manner of improving 15 side of cylinder head moderately Cylinder axis Z quite leans forward, i.e., is tilted with approaching approximate horizontal mode.
The centrifugal cooling fan 17 of engine cool, the cooling fan 17 are supported by the axis end axis of crankshaft 12 Cooling wind is generated as described later.In this case, cooling wind flow path as defined in being formed, cylinder 14, cylinder head 15 and cooling Fan 17 is covered by shield 18.Therefore, the position of cylinder 14 and cylinder head 15 covered by shield 18 is as shown in Figure 2, real It does not show in matter in appearance.
Power unit 10 further includes the actuating unit 19 joined integrally with crankcase 13, as the actuating unit 19, there is the stepless transmission constituted using band and belt wheel etc..In this embodiment, as shown in figure 4,13 or so one points of crankcase are Two Ground Splits constitute (crankcase 13R, crankcase 13L), and the shell 20 of actuating unit 19 is in conjunction with crankcase 13L.In shell Power is utilized to pass configured with the stepless transmission for including band and belt wheel etc. and constituting, crankshaft 12 and the axle of rear-wheel 109 in body 20 Dynamic device 19 links.
In addition, the illustration omitted in Fig. 2 etc., being configured in the upper surface side of actuating unit 19 includes air cleaner Deng and constitute gas handling system.In the gas handling system, air induction hose, throttling are connected in turn from air cleaner to its front Valve body and air inlet pipe (air intake duct) etc..The air inlet pipe is connected to the air inlet (air entry) 21 of cylinder head 15 shown in Fig. 2, via The intake channel being made of these components supplies purified air from air cleaner to the air inlet 21 of cylinder head 15.Separately Outside, fuel injection device is installed in the appropriate location of the midway of air inlet pipe, towards tuned port injection fuel.
On the other hand, in the exhaust system of exhaust gas of the discharge from engine 11, in this embodiment, under cylinder head 15 Surface side is provided with exhaust outlet.Exhaust pipe is combined on the exhaust outlet.Exhaust pipe from the interconnecting piece that is connect with exhaust outlet first to Right side extends, and then, is rearward bent and then is rearward extended by the close beneath of cooling fan 17.Exhaust pipe is also It is connect in vehicle rear with silencer 22 (referring to Fig.1).The burning gases generated in engine 11 are as exhaust gas, from exhaust outlet By exhaust pipe, finally it is discharged from silencer 22.
Next, being carried out in cooling cooling system to power unit 10, as previously mentioned, cylinder 14,15 and of cylinder head Cooling fan 17 is covered by shield 18 (referring to Fig. 2, Fig. 4 etc.).That is, including cooling fan 17, cylinder 14 and cylinder head 15 It is surrounded as shown in Figure 4 by shield 18.Shield 18 is formed by synthetic resin or plastic material, in crankcase 13, cylinder block The appropriate location of outer wall fixation is closely installed using the fixation members such as screw, i.e., substantially and as installation other side cylinder The joint portion of body etc. is seamlessly installed by fixation.Be provided projectingly from outer peripheral surfaces such as cylinders 14 each cooling blade 23 (referring to Fig. 3, The inner surface at top and shield 18 Fig. 4) forms certain gap at spaced intervals.
Here, simply indicating that crankshaft 12, crankshaft 12 are bent freely via bearing rotary using single dotted broken line in Fig. 4 Axle box 13R and crankcase 13L bearing.In this embodiment, as shown in figure 4, axis end side on the right side of crankshaft 12 is joined integrally has Cooling fan 17, in the cooling fan 17, as shown in figure 3, having multiple rotations along arranged circumferentially centered on crankshaft 12 Blade 24.In addition, the details that the cooling fan 17 comprising the rotating vane 24 etc. will be illustrated later.Cooling fan 17 are integrally rotatably combined with crankshaft 12.In 11 inside of engine of cooling fan 17, it is adjacent to configured with alternating current generator 25 (in Fig. 4, being schematically illustrated using double dot dash line), the rotor (not shown) and crankshaft 12 of the alternating current generator 25 are coaxial fixed, And it is rotated integrally with crankshaft 12.
Shape etc. about shield 18 offers and cooling fan in the right side of shield 18 corresponding with cooling fan 17 The concentric air inlet opening part 18a of 17 rotary shaft (crankshaft 12).In shield 18, side wall 18b (right side wall) is from air Inlet opening part 18a further extends to the right side corresponding position of cylinder head 15 forwards.When looking down, as shown in figure 4, shield The width of the side wall 18b of cover 18 narrows on the width of left and right from air inlet opening part 18a towards top, i.e., in the vertical view of Fig. 4 When, side wall 18b is formed by bending towards front in a manner of close to cylinder-bore axis Z with big radius of curvature.
In the basic role of the cooling fan structure of above structure, when engine 11 starts and rotates crankshaft 12, The rotating vane 24 for being installed on the cooling fan 17 of the axis end side of crankshaft 12 is rotated as the arrow A of Fig. 3.Thus cooling wind Air around fan 17 is inhaled into, from air inlet opening part 18a into shield 18 such as the arrow A of Fig. 4INIt is imported into like that. The mainstream of cooling wind such as arrow A1It is flowed like that along the inner wall of shield 18 to 15 direction of cylinder head.Then, cooling wind is upwards It is discharged around cylinder 14 and cylinder head 15 from cooling wind exhaust outlet with branches, the cooling winds of these branches such as lower sections.
In the present invention, as shown in Figure 5 and Figure 6, multiple with what is configured around its rotary shaft 26 in cooling fan 17 Rotating vane 24.In addition, Fig. 5 is the perspective view for being observed from the right cooling fan 17, Fig. 6 is cold from left side (12 side of crankshaft) But the perspective view of fan 17.Along the end on observation of rotary shaft 26, the direction of rotation (referring to Fig. 5, arrow A) of each rotating vane 24 Front end side is bent to hook-type.Here, the rotary shaft 26 of cooling fan 17 is simply indicated using single dotted broken line in Fig. 5 etc., And coaxially it is set in the axis end side on the right side of crankshaft 12.
Cooling fan 17 includes: the multiple rotating vanes 24 configured at predetermined intervals along direction of rotation, is supported on crankshaft 12 Right side axis end side base portion 27, in the axial direction of rotary shaft 26 across rotating vane 24 configure opposite with base portion 27 The reinforcement annular portion 28 of side, these components can be integrally formed by synthetic resin material.Base portion 27, which is in rotary shaft 26, is The heart it is substantially discoid, as specific mounting structure, for example, it may be the shaft end portion relative to the right side for being fixed on crankshaft 12 On bracket, using multiple installations protrusion 29, the structure linked using bolt etc., base portion 27 it is synchronous with crankshaft 12 rotation Turn.In addition, it is cyclic annular or donut-shaped for reinforcing annular portion 28.
Fig. 7 is the main view of the cooling fan 17 from left side (12 side of crankshaft), referring to the Fig. 7, base portion 27 and reinforcement circle Ring portion 28 concentrically configures, and the outer diameter of base portion 27 and the internal diameter for reinforcing annular portion 28 are substantially uniform.The Curved of rotating vane 24 As the position of hook-type, i.e., there is opening portion 30 in the front end side of rotating vane 24.The opening portion 30 of each rotating vane 24 is cold But the direction of rotation positive pressure side of fan 17 (in Fig. 7, illustrates specific rotating vane 24, positive pressure side is indicated with (+), suction side Indicated with (-), all rotating vanes 24 are all identical) opening.
In addition, having the arc sections 31 for forming hook-type in the front end side of each rotating vane 24, which is directed toward cooling The rotary shaft 26 of fan 17 and configured.Arc sections 31 are located at the direction of rotation front end of rotating vane 24, are formed as and rotate Axis 26 is opposite.
In addition, as shown in Figure 5 and Figure 6, each rotating vane 24 has width or height on 26 direction of rotary shaft, revolving The tip side (right side) of shaft 26 is interconnected via annular portion 28 is reinforced.In this case, the opening portion 30 of hook-type is prominent It is arranged to the inside for reinforcing annular portion 28.In other words, formed opening portion 30 rotating vane 24 front end side not with reinforce annulus Portion 28 is directly connected to, but is exposed to the inside for reinforcing annular portion 28 as shown in Figure 5.
On the other hand, base end side (left side) of each rotating vane 24 in rotary shaft 26, rotation interconnected via base portion 27 Turn direction front end side to connect with the base portion 27.In this case, as shown in Fig. 5 and Fig. 6 etc., the direction of rotation of rotating vane 24 Rear end side is extended from opening portion 30 towards the peripheral side for reinforcing annular portion 28 in generally arcuate deviously, and round with the reinforcement Ring portion 28 connects.More specifically, it is preferred that the direction of rotation rear end side of rotating vane 24 is relative to by arc sections 31 The radial direction of the rotary shaft 26 of approximate centre, extends to form to direction opposite to the direction of rotation.In addition, as the pivoting leaf The shape effect of piece 24, facilitates the rectified action to the air stream of importing.
Also, along the end on observation of rotary shaft 26, each rotating vane 24 is in the side opposite with the opening portion 30 of hook-type Suction side (being indicated in Fig. 7 with (-)) is provided with rib 32.In this example, in the above-mentioned of the direction of rotation rear end side of rotating vane 24 Arciform crooked position has one or more rib, in this case, it is two ribs 32, in the suction side of each rotating vane 24, from Hook-type position utilizes these ribs 32 to form recess portion 33 between the rear end of direction of rotation.In this case, as shown in fig. 7, it is preferred that , rib 32 is formed as relative to rotating vane 24 (direction of rotation rear end side) with scissors junction.In addition, as rotating vane 24 and rib 32 shape effect, facilitate the rectified action to the air stream of importing.About these rotating vanes 24 and rib 32, recessed Portion 33 etc., in the various figures, specific component mark appended drawing reference, but all rotating vanes 24 are all identical.
Here, the main function effect as present embodiment, firstly, being that driving source makes cooling fan 17 with crankshaft 12 Rotating vane 24 when rotating (such as Fig. 3, arrow A), the air around cooling fan 17 is inhaled into, and is opened from air importing Oral area 18a is imported into shield 18.At this point, flowing to positive pressure side from the front end side of rotating vane 24 (referring to Fig. 7, (+) region) Wind is rectified by the small whirlpool generated in the opening portion of hook-type 30, thus reduces air drag.
In this case, arc sections 31 are located at the direction of rotation front end of rotating vane 24, are directed toward the rotation of cooling fan 17 Shaft 26 and configured.By the way that big arc sections 31 are arranged in the direction of rotation front end side of rotating vane 24 as described above, Air drag when rotating vane 24 cuts wind reduces.Also, by the air drag for reducing rotating vane 24, and reduce institute The mechanical loss of meaning improves the working efficiency (fan efficiency) of cooling fan 17, as a result, can also assist in raising fuel oil Economy etc..
In the present invention, especially cooling fan 17 configures the receipts in the motor body of bearing crankshaft 12 as described below Appearance portion, the gap between each rotating vane 24 and the motor body for forming receiving portion is with towards engine central side and gradually Increase.Here, referring to Fig. 4 and Fig. 8, a part of the crankcase 13R as the right side for constituting crankcase 13 has from the side wall 34 further motor bodies 35 outstanding to the right.Using the motor body 35, as shown in Fig. 3 or Fig. 8 etc., to surround Mode around cooling fan 17 forms receiving portion 36.Also, motor body 35, the i.e. inner peripheral surface of receiving portion 36 and rotation Gap g as defined in being set between blade 24 (outer peripheral edge portion) (referring to Fig. 4).The rotating vane 24 of cooling fan 17 is accommodating Rotation in portion 36, to directed the air into shield 18 as previously mentioned.
Also, in the present invention, as shown in Figure 9 A, in the inner peripheral surface 36a of the receiving portion 36 formed by motor body 35 The gap g formed between rotating vane 24 as shown in the single dotted broken line B of Fig. 9 A, with towards engine central side (in Fig. 9 A In be left side (arrow L)) and be gradually increased.
More specifically, as shown in Fig. 6 and Fig. 9 A, rotating vane 24 26 direction of rotary shaft base end side (left side), i.e., The position of direction of rotation rear end side is formed as step-like, as shown in Figure 9 B, is provided with to form step-like multiple step heights Part 37 (37A, 37B, 37C, 37D...).In addition, Fig. 9 B is the portion the C enlarged drawing for indicating Fig. 9 A.These step height parts 37A, 37B, 37C, 37D... are formed along the single dotted broken line B of Fig. 9 A.Also, divide between the inner peripheral surface 36a of receiving portion 36 It is not formed with gap g1、g2、g3、g4..., size relation g1< g2< g3< g4。
In addition, being formed as being located at figure using the step-like position that step height part 37A, 37B, 37C, 37D... are formed The rear end side for the rotating vane 24 not being directly connected to base portion 27 shown in 6, i.e., than the outer peripheral edge of base portion 27 closer to outside Position.In addition, the case where quantity etc. of step height part 37A-37D is not limited to illustrated example, can suitably increase and decrease.
Also, the mutual step height difference of multiple step height part 37A, 37B, 37C, 37D... are non-constant, rule Fixed step height difference is set larger.Such as in the example of Fig. 9 B, step height part 37A and step height part 37B Between step height difference and the step height difference between step height part 37C and step height part 37D be set to it is larger.It is revolving The inboard of rotating vane piece 24 is formed with the aforementioned rib 32 positioned at the big position of these step heights difference.
The cooling fan structure of internal combustion engine of the invention is constituted as described above, its main function effect will be illustrated next Deng.Referring to FIGS. 10A and 10B, it is sucked using the rotation of the rotating vane 24 of cooling fan 17 from air inlet opening part 18a Air (0B referring to Fig.1, arrow AIN) become air stream from its upstream toward downstream as the arrow W such as Figure 10 B, and flow into Gap g.At this point, such as arrow W1, shown in W2, W3 like that, air quantity gradually increases with flowing from upstream toward downstream.Here, in sky In the case that the area of passage of air-flow is certain, as described above, the increased air stream of air quantity is closer to downstream side, pressure is higher, produces The raw position for being difficult to flow, i.e., when being more than allowable limit, if keeping original state, will lead to can not flow.In the present invention, pass through The gap g between the inner peripheral surface 36a of receiving portion 36 and rotating vane 24 is set to entreat side, i.e. air stream within the engine as described above Pressure improve downstream side increase, so that the area of passage of the air stream near downstream side be made ordinatedly gradually to increase with air quantity Greatly.As described above, the area of passage at the position by ensuring pressure raising is bigger than the area of passage at other positions, it is capable of forming suitable Smooth air stream reduces air drag.In this case, make to produce by the air of step-like multiple step height parts 37 Raw small whirlpool, and prevent from passing through the air between cooling fan 17 and motor body 35 (receiving portion 36) and generate turbulent whirlpool Whirlpool, and then keep air stream smooth and reduce air drag.Also, substantially improve the air supply efficiency as cooling fan 17 (fan efficiency).
In this case, the position of the direction of rotation rear end side of rotating vane 24 is made to be formed as step-like, such as Fig. 9 B institute Show, makes the gap g formed by multiple step height part 37A, 37B, 37C, 37D...1、g2、g3、g4... be formed as closer to Downstream side (left side, the i.e. base end side of rotary shaft 26) is bigger, so as to effectively expand the area of passage near downstream side.
At this point, step-like position is located at the outer peripheral edge than base portion 27 closer to the position in outside, that is, it is virtually clear not The base portion 27 of the access of air stream can be become, and form step height part 37A, 37B, 37C, 37D... on the outside.Pass through Configuration forms step height part 37 in this wise, has in gap g1、g2、g3、g4... air stream downstream side near it is logical Road surface product expands effect.
Also, it is set as in the step height difference formed between multiple step height part 37A, 37B, 37C, 37D... The big position of defined step height difference is formed with rib 32.
So, it by the way that rib 32 is arranged at the big position of step height difference, and effectively ensures that and is used to form recess portion 33 Space.Also, recess portion 33 easy to use generates small whirlpool, utilizes the air at the step-like position by step height part 37 Small whirlpool is generated, the air generation for thus preventing from passing through between cooling fan 17 and motor body 35 (receiving portion 36) is disorderly Stream, also can make air stream smooth according to this, reduce air drag.
So, make the gap g of receiving portion 36 and rotating vane 24 bigger closer to engine central side, and make air The area of passage near the downstream side of stream is ordinatedly gradually increased with air quantity.It does not need substantially to increase other component etc., only lead to Cross and design changed to the shape of rotating vane 24, it will be able to be simply formed, and as the air output of cooling fan 17 with Existing product indifference, that is, not only ensured that air output was more than same, but also the number of rotating vane 24 can be substantially reduced. So, it can either ensure to maintain the wind pushing performance of cooling fan 17, and can be realized the lightweight etc. of device, at this point, logical The number for reducing rotating vane 24 is crossed, the area of passage of the wind of the air of importing can be expanded, can also be reduced by this point Air drag.
Here, in the above-described embodiment, illustrate that the predetermined portion by rotating vane 24 is formed as step-like example, The straight line reported to the leadship after accomplishing a task as the single dotted broken line B of Fig. 9 A along the inner peripheral surface 36a with receiving portion 36 with acute angle, such as even if be formed as The notch features of roughly triangular shape can also obtain same effect.In this case, notch features as described above have The advantages that being easily formed.
It this concludes the description of various embodiments of the invention, embodiment that the present invention is not restricted to these, in model of the invention Change etc. is able to carry out in enclosing.
The rotating vane 24 of above embodiment, the step height part 37A-37D on rotating vane 24 or rib 32 quantity etc. is not limited to illustrated example, can according to need and is increased and decreased.

Claims (2)

1. a kind of cooling fan structure of internal combustion engine, there is cooling fan, the cooling fan by engine crankshaft power drive, The cooling fan structure of the internal combustion engine is characterized in that,
The cooling fan is configured at the receiving portion of motor body, and has around the shaft end for being coaxially set in the crankshaft The rotating vane of the rotary shaft rotation in portion,
The cooling fan sucks air from the tip side of the rotary shaft, opposite with the shaft end portion of crankshaft side, And to after discharge air on the outside of radial direction, air is made to flow to the crankshaft side along the direction of the rotary shaft,
Gap between the rotating vane and the motor body for forming the receiving portion is formed as more towards engine The center side gap becomes bigger, and in the radial direction of the rotating vane lateral margin and the rotating vane radial direction Lateral border, which is compared, to be located on front side of direction of rotation,
The air sucked using the rotation of the rotating vane from air inlet opening part becomes the sky from upstream towards downstream Air-flow, and the gap is flowed into,
The rear end side of the direction of rotation of the rotating vane is provided with multiple step height parts and is formed as step-like, multiple Step height part forms the gap between the rotating vane and the motor body,
It is formed with rib in the suction side of the rotating vane, which is located at the adjacent step height component of the step height part Between the big position of step height difference.
2. the cooling fan structure of internal combustion engine as described in claim 1, which is characterized in that
The step-like step height is partly arranged at the outer peripheral edge than the base portion of the cooling fan closer to the position in outside It sets.
CN201610080579.6A 2015-02-13 2016-02-04 The cooling fan structure of internal combustion engine Active CN105889126B (en)

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JP2015026579A JP6561485B2 (en) 2015-02-13 2015-02-13 Cooling fan structure for internal combustion engine
JP2015-026579 2015-02-13

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Citations (4)

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CN203488401U (en) * 2013-09-22 2014-03-19 浙江北辰电机制造有限公司 Combined type helical fan

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JP3953085B1 (en) * 2006-03-08 2007-08-01 ダイキン工業株式会社 Centrifugal blower impeller blade, blade support rotating body, centrifugal blower impeller, and method for manufacturing centrifugal blower impeller
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CN101498317A (en) * 2008-02-01 2009-08-05 富准精密工业(深圳)有限公司 Heat radiating fun and impeller thereof
CN102003416A (en) * 2009-08-31 2011-04-06 本田技研工业株式会社 Noise prevention structure of a centrifugal type cooling fan
CN202125439U (en) * 2011-06-01 2012-01-25 中山大洋电机制造有限公司 Novel radiating fan and motor using same
CN203488401U (en) * 2013-09-22 2014-03-19 浙江北辰电机制造有限公司 Combined type helical fan

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JP6561485B2 (en) 2019-08-21
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