CN1192171C - Cooling fan for air-cooled engine - Google Patents
Cooling fan for air-cooled engine Download PDFInfo
- Publication number
- CN1192171C CN1192171C CNB991012542A CN99101254A CN1192171C CN 1192171 C CN1192171 C CN 1192171C CN B991012542 A CNB991012542 A CN B991012542A CN 99101254 A CN99101254 A CN 99101254A CN 1192171 C CN1192171 C CN 1192171C
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- Prior art keywords
- cooling fan
- fan
- back plate
- cooling
- stiffening rib
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Abstract
A cooling fan made of synthetic resin for an air-cooled engine which is fixedly secured to a side of the body of a flywheel includes a plurality of cooling fins formed along a circumferencial direction thereof, and a circular reinforcement rib projecting axially from the periphery of a backboard, thereby reducing deformation of the fan during running of the engine and preventing deformation of the fan during transportation, without significantly increasing the weight of the fan.
Description
Technical field
The present invention relates to a kind of cooling fan made from synthetic resin, it relates to a kind of improved cooling fan that the flywheel Small Universal air cooling engine and motor forms one that is used for or rather.
Background technique
Be used for industry and fields such as agricultural the general small-size air cooling engine cooling fan traditionally cylinder iron or cast aluminium alloy make, and with the flywheel formation one of motor.In recent years, a kind ofly be suitable for being fastened on being widely used of flywheel one side with the mold formed cooling fan of thermoplastic synthetic resin, this is because make the structure of cooled blade become complicated to the ever-increasing demand of fan cooled lobe numbers, thereby comes difficulty for the metal pattern Cast Strip.
Fig. 4 illustrates a kind of example of traditional cooling fan of this form made from synthetic resin, and it is proposed in Japanese utility model application Sho 55-70252 by the present patent application people.
In Fig. 4, comprise a flywheel body ' a ', a synthetic resin fan ' a
2' and a starting belt pulley ' d ' couple together by some bolts ' g ' at interior all parts and become an integral body.Pad of reference character ' h ' expression.Flywheel body ' a ' and fan ' a
2' be fastened on the bent axle ' b ' of motor with nut ' e '.Fan ' a
2' be fixed on the flywheel ' a ' and with flywheel and rotate synchronously with engine speed, its effect as same centrifugal blower aspirate cold air and remove to cool off the gentle cylinder cap of cylinder.
Open or disclose the flywheel-cooling fan of other monomeric forms by Japan Patent Hei 9-250348 by Japanese Utility Model Hei 6-58125, though they are different with the cooling fan among Fig. 4, also be the cooling fan that forms one with flywheel.According to Sho 9-250348 invention disclosed, the cooling fan of being made by synthetic resin fixes with special clamping bolt and flywheel, and is fixed on the bent axle together with the starting belt pulley.And in the disclosed device of Hei 6-58125, the cooling fan of making by synthetic resin then be with some bolt to the flywheel of metal casting.
As above-mentioned Japanese utility model application Sho 55-70252 (see figure 4), patent Hei 9-250348 announced or model utility Hei 6-58125 etc. is disclosed traditional synthetic resin cooling fan, its common drawback is that the negative blast effect that produces during the heat that produces because of motor easily of fan and the engine running is out of shape.So, cooling fan ' a
2' can be to the inside a side of cooled blade (promptly with) rearward crooked, cooling fan just might be collided with guide plate or with cooling-air duct as a result.In the past, multinomial suggestion was once proposed, such as making cooling-air duct and fan ' a in order to overcome this shortcoming
2' gap that keeps broad each other between the (see figure 4), its shortcoming is to reduce fan ' a
2' the air blast characteristic.Another suggestion is to increase fan ' a
2' back plate ' a
3' thickness or at back plate ' a
3' rear wall on arrange that stiffening rib is to improve fan ' a
2' intensity.The suggestion that has again is that cooled blade is extended to improve fan ' a to the center
2' rigidity.But all these traditional cooling fan structures all can bring adverse effect, for example increase the weight of fan and make the structure complicated of fan.
In traditional synthetic resin cooling fan, back plate ' a
3' rear wall be straight, plate skids easily thereby the shortcoming that causes is the back, and when many fans irregularly being placed on when transporting in the packaging box, fan is easy to deform.
Summary of the invention
Therefore main purpose of the present invention is that a kind of being made and formed the cooling fan of one with flywheel by the synthetic resin material of Small Universal air cooling engine that be applicable to will be provided, at the motor run duration, the distortion of fan is reduced, in transportation process, make fan not produce distortion, and the weight of fan does not significantly increase.
In order to solve aforementioned technical problem, the invention provides a kind of cooling fan that is fixed on flywheel one side of air cooling engine, described fan is made by the synthetic resin material, and comprises: the back plate of a circle; A plurality of cooled blades that are evenly distributed along the circumference of described circular back plate; And from the peripheral edge of back plate, from the ring stiffener of back plate to flywheel main body side axial projections; The internal diameter of described stiffening rib is a bit larger tham the external diameter of described cooled blade, and therefore when a pair of described cooling fan was stacked together, the cooled blade of one of them fan just can be nested in the internal diameter of another fan stiffening rib.
The present invention also provides an assembling process, comprise many cooling fans are piled up according to a mode that stacks above another, each described cooling fan comprises back plate and a plurality of cooled blade that is evenly distributed along the circumference of described back plate of a circle, and from the peripheral edge of back plate the ring stiffener of axial projections, and
The internal diameter of described stiffening rib is a bit larger tham the front side external diameter of described cooled blade, the front side external diameter of a cooling fan is nested among the stiffening rib internal diameter of another cooling fan, and a plurality of cooling fans are stacked.
The present invention also provides a kind of air cooling engine, has a bent axle; A flywheel that is installed on the described bent axle, and a cooling fan made from synthetic resin that is fastened on described flywheel one side; Described cooling fan comprises plate and a plurality of cooled blade that is evenly distributed along the circumference of described back plate after one, and from the peripheral edge of described back plate from the ring stiffener of back plate to flywheel main body side axial projections, the internal diameter of described stiffening rib is a bit larger tham the external diameter of described cooled blade.
The present invention also provides a kind of packing body of a plurality of cooling fans, each described cooling fan comprises plate and a plurality of cooled blade that is evenly distributed along the circumference of described back plate after one, and from the peripheral edge of back plate the ring stiffener of axial projections, therefore the internal diameter of described stiffening rib is a bit larger tham the external diameter of described cooled blade, stacks a plurality of cooling fans under the state among the cooled blade of a cooling fan can be nested in the internal diameter of stiffening rib of cooling fan of another adjacent one another.
First aspect according to content of the present invention, a kind of synthetic resin cooling fan that is used for small-sized air cooling engine is provided, this fan is fixed on a side of flywheel body, along its circumferencial direction many cooled blades is arranged, and on the peripheral edge of plate thereafter the ring stiffener of projection is vertically arranged together.According to this a first aspect of the present invention, because this stiffening rib is improved the rigidity of fan, even since motor when operation the heat that produces make it that to a certain degree softening be arranged, this fan also can be avoided the caused distortion of blast when supplying gas, thereby can keep that rational gap is arranged between cooling fan and the cooling-air duct, avoid colliding between the cooling fan that causes because of fan distortion and the cooling-air duct.In addition, this cooling fan has only been set up ring stiffener, has improved the rigidity of fan thus with simple structure, and to make the weight of increase be minimum.
According to a second aspect of the invention, at the cooling fan that is used for air cooling engine according to first aspect present invention provided, the internal diameter of stiffening rib is a bit larger tham the external diameter of cooled blade, therefore overlapping or when nesting together when a pair of cooling fan, the cooled blade of one of them cooling fan just can be nested in the internal diameter of stiffening rib of another fan.
Second aspect according to content of the present invention, nested or when being stacked together when a pair of fan, the external diameter of the cooled blade of one of them cooling fan can be fitted in the internal diameter of another fan stiffening rib, improved the volumetric efficiency of packed and transported thus, and can avoid because the random fan performance that is deposited in caused together deformable blade and causes thus of many fans reduces.
Description of drawings
Describe the present invention with reference to the accompanying drawings in detail.In the accompanying drawing:
Fig. 1 is the sectional view of cutting open along axis that is used for cooling fan general air cooling engine and that be fitted together with flywheel according to the preferred embodiment of the present invention;
Fig. 2 is the front elevation of Fig. 1 cooling fan;
Fig. 3 is that a pair of cooling fan according to the embodiment of the invention stacks mutually or the sectional view when overlaping;
Fig. 4 is the sectional view of traditional cooling fan of being fitted together with flywheel.
Embodiment
Hereinafter with reference to accompanying drawing the preferred embodiments of the present invention are done detailed explanation.To the size of component described in this example, material, the explanation of structure and mutual alignment only is the explanation that embodiment is made, rather than to the restriction of scope of the present invention, but have Special Statement except.
Fig. 1 shows the sectional view of cutting open along crankshaft center line that is used for the cooling fan that is fitted together with flywheel on the general air cooling engine according to the preferred embodiment of the present invention; Fig. 2 is its front elevation; And Fig. 3 shows a pair of stacking mutually or nested together the sectional view of cooling fan.
Fig. 1 and Fig. 2 show cast iron flywheel body 1 and synthetic resin cooling fan 2.The mounting flange 7a and the belt pulley 7 that are used on the belt pulley 7 of kick starter (a recoil starter) are made of one.Flywheel body 1, cooling fan 2, and mounting flange 7a passes pad 9 by some bolts 8 and couples together and form one.Annular distance (loop holes) 2C is in the outside of pad 9 to avoid bolt 8.Center hole 2e on the cooling fan 2 matches with convex shoulder 1a on the flywheel body 1.In order to align, side in flywheel body 1 has a plurality of (such as three) projection 1b along the distribution of angular distances such as circumference, their corresponding with the quantity that is positioned at cooling fan 2 one sides rectangular opening 2d that distributes along angular distances such as circumference match, thereby make cooling fan 2 can fix reliably with flywheel body 1 on sense of rotation.
One circle circle or annular stiffening rib 2a are positioned on the peripheral edge of cooling fan 2, and plate 2f stretches out vertically to the direction of flywheel body 1 from the back.Some cooled blade 2b along the circumferential direction are equally spaced on the back plate 2f of cooling fan 2.
As shown in Figure 3, stiffening rib 2a designs like this, i.e. the inner diameter d of stiffening rib
1Be slightly larger than the outside diameter d of cooled blade 2b
2, with the fan that when packing fan, the takes place distortion of avoiding to mention after a while with box.
The rotational position of flywheel body 1 is fixed by key 4, by fastening nut 6 flywheel body is fixed on the bent axle 3 firmly.A magnet 11 is installed on flywheel body 1, and magnet 11 is fixed on change the magnetic flux on the iron core in the coil 12 on motor body one side when flywheel body 1 rotation, thereby can produce the electric current that is used to light a fire in coil 12.
Flywheel and flywheel body 1 and cooling fan 2 utilize they self weight to absorb and eliminate the vibration moment of torsion of engine crankshaft 3, and play the effect of centrifugal blower simultaneously, thereby the cooling fan 2 that is arranged on the flywheel body 1 can effectively carry cooling air to go the cylinder and the cylinder head of cooled engine.
The motor of flywheel structure with this form is in when operation, even the synthetic resin fan is a bit softening because of the heat that is subjected to the motor generation has, but, thereby still can avoid the negative blast that when carrying air, produces and the distortion of the cooling fan 2 that causes on the outer periphery of the back plate 2f of cooling fan 2 owing to the ring stiffening rib 2a that has a circle to have predetermined altitude is strengthened the cooling fan rigidity.So, cooling fan 2 is not inwardly (promptly towards cooled blade) bending backward just, and blade 2b just can not bump with cooling-air duct.So the distance between cooling-air duct and the cooling fan 2 can correctly keep, thereby can avoid fan air blast characteristic variation.
Therefore, according to present embodiment, owing to only increased very little together stiffening rib on cooling fan 2, so this cooling fan is simple in structure, and its weight has only very a spot of increase.
Fig. 3 shown a pair of overlapping or cooling fan with same structure 2 and 2 that nests together '.Cooling fan 2 ' the inner diameter d of stiffening rib 2 ' a
1The outside diameter d of being a bit larger tham the cooled blade 2b of cooling fan 2
2This just makes cooling fan can stack (overlapping) easily mutually together and reduced the danger of toppling over when piling up, and particularly this advantage is more obvious when the fan part number is a lot.Therefore, when casing in the preparation transportation and with fan, compare with random random stacking, with cooling fan 2 and 2 ' pile up and to improve volumetric efficiency greatly in the mode that overlaps each other or stack, and owing to there is not local unbalanced force to act on the cooling fan, thereby can avoid the distortion of in transportation process, pushing mutually, rolling and causing.
If desired, the pad among the embodiment 9 can be made of one with belt pulley mounting flange 7a or with flywheel body 1.
Therefore, according to above explanation of the present invention, during engine running, owing on the peripheral edge of plate behind the cooling fan, there being a circle stiffening rib that the rigidity of cooling fan is strengthened, even thereby fan is subjected to the heat of motor generation and has a bit softening, but still the distortion of the cooling fan that the negative blast can avoid because of air blast the time causes, so cooling fan just can not be inwardly and crooked backward and bump with cooling-air duct.
According to the present invention, the distance between cooling-air duct and the cooling fan can correctly keep all the time, thereby makes the air blast characteristic of cooling fan remain good state.Owing to only by increased together little stiffening rib on cooling fan, therefore provide a kind of simple in structure, the weight increase seldom and the fan that reduces of cost.
According to the present invention, to the structural design of cooling fan stiffening rib internal diameter it can easily be nested together with the external diameter of cooled blade on the cooling fan, this has just reduced fan because of toppling over the possibility of colliding with mutually, and particularly effect is more obvious under a lot of situation of fan part number.This design can also avoid cooling fan to deform in process of container transportation, and has improved volumetric efficiency, thereby the cost of vanning transportation just might reduce.
Claims (4)
1. cooling fan that is fixed on flywheel one side of air cooling engine, described fan is made by the synthetic resin material, and comprises:
The back plate of a circle (2f, 2 ' f);
A plurality of cooled blades (2b, 2 ' b) that are evenly distributed along the circumference of described circular back plate (2f, 2 ' f); And
From back plate (2f, 2 ' f) on the peripheral edge, from the ring stiffener (2a of back plate to flywheel main body side axial projections, 2 ' a), and described stiffening rib (2a, 2 ' a) internal diameter is a bit larger tham described cooled blade (2b, 2 ' b) external diameter, therefore work as a pair of described cooling fan (2,2 ') when being stacked together, the cooled blade of one of them fan just can be nested in the internal diameter of another fan stiffening rib.
2. an assembling process comprises many cooling fans is piled up according to a mode that stacks above another,
Each described cooling fan comprises back plate (2f, 2 ' f) and a plurality of cooled blade (2b, 2 ' b) that is evenly distributed along the circumference of described back plate of a circle, and from the peripheral edge of back plate axial projections ring stiffener (2a, 2 ' a), and
(2a, 2 ' a) internal diameter is a bit larger tham the front side external diameter of described cooled blade (2b, 2 ' b) to described stiffening rib, the front side external diameter of a cooling fan is nested among the stiffening rib internal diameter of another cooling fan, and a plurality of cooling fans (2,2 ') are stacked.
3. an air cooling engine has a bent axle (3);
A flywheel (1) that is installed on the described bent axle, and a cooling fan made from synthetic resin that is fastened on described flywheel (1) one side;
Described cooling fan comprises plate after (2f) and a plurality of cooled blade (2b) that is evenly distributed along the circumference of described back plate, and from the peripheral edge of described back plate from the ring stiffener (2a) of back plate to flywheel main body side axial projections, the internal diameter of described stiffening rib (2a) is a bit larger tham the external diameter of described cooled blade (2b).
4. the packing body of a plurality of cooling fans, plate (2f after each described cooling fan comprises one, 2 ' f) and a plurality of cooled blade (2b that is evenly distributed along the circumference of described back plate, 2 ' b), and from the peripheral edge of back plate the ring stiffener (2a of axial projections, 2 ' a), the internal diameter of described stiffening rib is a bit larger tham the external diameter of described cooled blade, therefore stack a plurality of cooling fans under the state among the cooled blade of a cooling fan can be nested in the internal diameter of stiffening rib of cooling fan (2,2 ') of another adjacent one another.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB991012542A CN1192171C (en) | 1998-01-27 | 1999-01-26 | Cooling fan for air-cooled engine |
Applications Claiming Priority (4)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP29219/1998 | 1998-01-27 | ||
| JP29219/98 | 1998-01-27 | ||
| JP02921998A JP3943691B2 (en) | 1998-01-27 | 1998-01-27 | Cooling fan for air cooling engine |
| CNB991012542A CN1192171C (en) | 1998-01-27 | 1999-01-26 | Cooling fan for air-cooled engine |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1224807A CN1224807A (en) | 1999-08-04 |
| CN1192171C true CN1192171C (en) | 2005-03-09 |
Family
ID=34634875
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB991012542A Expired - Fee Related CN1192171C (en) | 1998-01-27 | 1999-01-26 | Cooling fan for air-cooled engine |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1192171C (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4531481B2 (en) * | 2004-08-10 | 2010-08-25 | 本田技研工業株式会社 | Power unit cooling system |
| CN103573696A (en) * | 2012-08-09 | 2014-02-12 | 任文华 | Impeller and fan comprising same |
| JP5988775B2 (en) * | 2012-08-29 | 2016-09-07 | 日立オートモティブシステムズ株式会社 | Water pump |
| CN105090105A (en) * | 2015-06-30 | 2015-11-25 | 黑龙江凯普瑞机械设备有限公司 | Centrifugal fan and impeller thereof |
| CN106979276A (en) * | 2016-01-19 | 2017-07-25 | 杨德亭 | Fan for cooling counter-weight flywheel |
-
1999
- 1999-01-26 CN CNB991012542A patent/CN1192171C/en not_active Expired - Fee Related
Also Published As
| Publication number | Publication date |
|---|---|
| CN1224807A (en) | 1999-08-04 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20050309 Termination date: 20180126 |
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| CF01 | Termination of patent right due to non-payment of annual fee |