CN1040788C

CN1040788C - Engine cover

Info

Publication number: CN1040788C
Application number: CN93100655A
Authority: CN
Inventors: 久保田良; 吉村伸一
Original assignee: Honda Motor Co Ltd
Current assignee: Honda Motor Co Ltd
Priority date: 1992-01-30
Filing date: 1993-01-29
Publication date: 1998-11-18
Anticipated expiration: 2013-01-29
Also published as: JPH05202766A; CN1077006A; TW229185B; FR2686942B1; JP3021166B2; FR2686942A1

Abstract

The said cover (8) comprises a connection zone (21) joining a first covering element (18) to a second covering element (19), as well as an elastic component (24) made up of an elastic material of the rubber or elastic synthetic resin type. The elastic component (24) is positioned so that it straddles the adjoining zone (21) and it is rigidly connected by its two ends, in the stretched state, to each of the said covering elements (18, 19).

Description

Engine hood

The present invention relates to the engine hood of covering engine main body.

Usually, be provided with engine hood be for the noise protecting engine main body and prevent to produce by engine main body to external diffusion.Because engine hood need have the moderate rigidity, so it is normally made with metal, hard synthetic resin or similar material.In addition, it often is bonded with each other by several cover spares and forms, and these cover parts are connected on the engine main body as integral body.

The engine hood that is contained on the engine main body is caused vibration by the vibration of motor, the vibration of motor causes engine hood itself to produce noise easily.Particularly cause the relative vibration on the connection surface that adjoins each other, make the attachment portion of two cover parts and an attachment portion that the cover part is connected on the engine main body produce noise.Vibration might make the attachment portion separate and produce the slit, and inner noise is outwards propagated.

In this case, for connecting two adjacent members closely securely, need many parts in the attachment portion, simultaneously, connecting at two need the insertion vibroisolating material between the surface.

Although the model utility open file of Japanese unexamined SHO.57-110599 number (No.110599/1982) has disclosed by rubber or has had wire gaze or sound-insulating cover that enhancement mode synthetic resin wiry is made.Sound-insulating cover can not the covering engine main body outer periphery and protect engine main body because it has easy platy structure, do not have enough rigidity.

In addition, the model utility open file of Japanese unexamined SHO.62-15476 number (No. 15476/1987) has disclosed with the integrally formed seamless engine hood of elastomeric objects (for example rubber), but the integrally formed seamless engine hood with blade air door is fit to respectively between the radiating fin of cylinder and the connection between the radiating fin at cylinder top.Yet it can only keep the shape of engine hood, because this cover also is fixed on the engine main body by the blade air door.Therefore, if the blade air door is not set, just can not form with the integrally formed engine hood of above-mentioned elastomeric objects with moderate rigidity.

So, an object of the present invention is to provide the engine hood that overcomes the shortcoming that exists in the prior art, it has enough rigidity and sound insulation vibration isolating effect.

Another object of the present invention provides a kind of engine hood simple in structure, can reduce the quantity of vibroisolating material being installed and being connected in the required part of cover part itself.

Constitute by two cover parts that link together according to engine hood provided by the invention, it is characterized in that: the tabular elastic component of being made by rubber strides across ground, the attachment portion setting that the first cover part and second covers part, the above-mentioned first cover part and the second cover part covering engine main body are with respect to above-mentioned two cover parts, under tension state, fix the two ends of this elastic component, the mounting portion of above-mentioned elastic component is set in the two side portion of engine main body one side of above-mentioned two cover parts.

According to the present invention, in engine hood, the butt first cover part and the second cover part or cover part and engine main body force their mutual extrusion by under the tension force condition elastic component being installed mutually.So that they can contact closely along the attachment portion.Therefore the quantity of part reduces significantly, because do not need along the attachment portion many links to be installed, as screw.In addition, can connect apace at an easy rate, because, just can connect two members closely just by firmly the two ends of elastic component being connected on each adjacent member respectively.

As mentioned above, elastic component plays connector element, simultaneously, contact the surface of the roomy area of engine hood closely, so that play soundproof material or vibroisolating material, by this way, can reduce the quantity that soundproof material and the required part of vibroisolating material are installed on engine main body, also can simplify the structure of engine hood.

Be described in detail the present invention below in conjunction with accompanying drawing.

Fig. 1 is the cross sectional view that shows the cluster engine profile of scooter.

An embodiment of perspective representation shown in Figure 2 engine hood of the present invention, it is made up of the guard shield of fan guard and engine of small motorcycle group.

Fig. 3 is the cross sectional view that shows engine hood attachment portion example.

Fig. 4 is the expansion planimetric map of elastic component.

Fig. 5 is a side view of seeing engine hood from fan guard.

Fig. 6 is the cross sectional view along the VI-VI line of Fig. 5.

Fig. 7 is the cross sectional view that shows another embodiment of the present invention.

Foregoing of the present invention and other purpose and characteristic are applied to the oscillating-type cluster engine from below, for example will become more clear in the narration of the preferred embodiment of scooter.

Fig. 1 is the cross sectional view that shows oscillating-type cluster engine integral body, this cluster engine is equipped with motor 1 in its front portion, at its rear portion the axletree 3 that rotatably supports trailing wheel is housed, the front portion of cluster engine is articulated in a member (not shown) so that upper and lower swing.Axletree 3 is articulated in the rear end part of the side that the crankcase 4 of motor 1 extends back.

The cylinder of label 5 expression motors 1, what label 6 was represented is bent axle.Cooling fan 7 is fixed on and passes the end of crankcase 4 at the right-hand bent axle that stretches out 6 of figure.During engine running, the cooling blast that produces by fan 7 is suitable for forcing cooled engine 1.The outer cause cover 8 of motor 1 from the outer rim of fan 7 to cylinder 5 covers, and simultaneously in the front of fan 7, cover 8 is equipped with suction port 9.Cover 8 effect is to supply with from suction port 9 to enter, produced and around the cooling blast of cylinder 5, made the noise of motor 1 directly not be diffused into the outside by fan 7, and from outer protection motor 1.

As mentioned above,, be positioned at a side of motor 1, the gearbox 10 of the opening outwardly that forms by the crankcase 4 that extends back on the opposite of fan 7.In the front portion of cluster engine, bent axle 6 puts in gearbox 10 and by the automatic transmission 14 that variable pulleys 12a, 12b form, the vee-belt that is fixed between the above-mentioned pulley is arranged between the driven shaft 11 at bent axle 6 and unit rear portion.Because above-mentioned layout, engine power is delivered to bent axle 6, automatic transmission, clutch 15, driven shaft 11, gearing 16, is delivered to axletree 3 at last.The open part of gearbox 10 is different from 17 coverings of cover of cover 8 by another, so that blocking-up is at the noise of gearbox 10 inside and the interior arrangement of protection gearbox 10.

Cover 8,17 is made by metal, hard synthetic resin or similar material respectively, and need have the rigidity of expectation.

Fig. 2 shows the first embodiment of the present invention of using cover 8 to Fig. 6.Fig. 2 sees from behind corresponding to the perspective view of Fig. 1 cover 8 and the interior arrangement of above-mentioned figure.

Cover 8 is made up of fan guard (first cover part) 18 and guard shield (the second cover part) 19, that side of the fan 7 of fan guard 18 covering engines 1, and to the cylinder 5 on top, guard shield 19 then covers the opposite side of cylinder 5 from its outer periphery.These two

cover parts

18,19 are fixed on its bottom on the engine main body by standing part 20 with bolt respectively.

The top of fan guard 18 and guard shield 19 ground respectively and is equipped with the attachment portion 21 that connects each cover part opposed edges end to the semicircle periphery separately around the cylinder 5 of motor 1 at their middle part.The recessed portion 22 that is shaped of marginal end that this attachment portion 21 can fan guard 18 and the prolongation 23 of guard shield 19 are connected and form.

If fan guard 18 and guard shield 19 vibrations and between them, cause relative displacement, and owing to its vibration produces noise.In addition, if separate, produce the slit that cooling blast leaks owing to separating between recessed portion 22 and prolongation 23, simultaneously, inner noise is diffusion therefrom also.In this case, connection recessed portion 22 preferably always closely contacts with prolongation 23, that is to say, need firmly be connected to fan guard 18 on the guard shield 19 along attachment portion 21.

Yet, in cover 8, it should be noted and do not use the such fixing device of screw securely fan guard 18 and guard shield 19 to be fixed on the attachment portion 21, but realize fan guard 18 and tight be connected of guard shield 19 on attachment portion 21 by elastic component 24, elastic component 24 straddles and connects on 21 parts, and its two ends are fixedly attached on fan guard 18 and the guard shield 19.Under tension state, configuration during elastic component 24 between fan guard 18 and guard shield 19, the contractile force by elastic component 24 forces fan guard 18 and guard shield 19 to interconnect, the result, two cover parts are 21 contacts closely mutually along the attachment portion.

Form elastic component 24 by the mold pressing elastic material, use medium pulling force and can as rubber or elastic synthetic resin, flexibly stretch, thus formation the sort of tabular body as shown in Figure 4.The end formed attachment hole 25 of the main body 24a of elastic component 24 makes the main body 24a of elastic component 24 be suitable for abutting against the surface of guard shield 19, at the other end of main body 24a place's shaping attachment hole 26a, 26b, makes main body 24a be suitable for abutting against the surface of fan guard 18.In addition, near the position of attachment hole 26 1 sides, main body 24a has a upwardly extending banded projection 24b, and the circular hole 27 of shaping is arranged on its top.

On the other hand, be equipped with outstanding connection jut 28 at the back side of guard shield 19, be connected with attachment hole 25 (referring to Fig. 2), be equipped with outstanding connection jut 29a, 29b at the back side of fan guard 18, they be fit to be connected (shown in Fig. 5,6) with attachment hole 26a, 26b.

Assembling about elastic component 24, for example, at first attachment hole 26a, 26b are connected on corresponding connection jut 29a, the 29b on fan guard 18 1 examples, then main body 24a are striden across the side that attachment portion 21 pulls to guard shield 19, attachment hole 25 is connected with the corresponding jut 28 that is connected.Yet if main body 24a is not stretched over to a certain degree, main body 24a just can not be used for making attachment hole 25 and be connected jut 28 and assemble mutually.So, when main body 24a is under the tension state, tension force by it is contained in when connecting between the jut 29 and 28 along the direction of both ends that connects, 21 places make fan guard 18 and guard shield 19 force extruding mutually by the elastic force of main body 24a in the attachment portion, at last, make attachment portion 21 be in tight contact condition.

The outstanding jut 30 that is shaped on circular hole 27 and fan guard 18 major components is engaged, and the extension 24b of elastic component 24 just is connected on the major component of fan guard 18.In addition, the lower end of main body 24a middle part is installed on the locating piece 31,31 on fan guard 18 and the guard shield 19.Like this, main body 24a is suspended from the top of extension 24b, is held simultaneously its bottom by locating piece 31, so that it can locate on the outer periphery of fan guard 18 and guard shield 19, and makes like a dream on the roomy surface of outer periphery and contacts closely.As mentioned above, like this, elastic component 24 has played the effect of the link that fan guard 18 and guard shield 19 are linked together, and simultaneously, has also played in the lip-deep soundproof material of roomy area that spreads all over cover 8 or the effect of vibroisolating material.

In this embodiment, because the peripheral part of the suction port 9 of fan guard 18 is not covered by elastic component 24,, prevent that noise is therefrom to external diffusion so on the outer surface of peripheral part, provide the soundproof material of making by polyurethane or materials similar 32.The outer periphery of fan guard 18 are provided with the edge 33 of rising, so that upper parts around the cover part from the periphery of suction port 9 to it, soundproof material 32 is placed in the edge 33 of rising, the edge 33 usefulness dividing plates 34 that raise are pushed down from the outside, dividing plate 34 is configured in the periphery at the edge 33 of rising, and is securely fixed on the fan guard with rivet 35.

The edge 33 that raises connect jut 29a, 29b near be cut off, on cutout portion, these juts 29a, 29b are configured on the elongation line at edge 33 of rising.This cutout portion is the edge section that is used for embedding elastic component 24, and attachment hole 26 is connected with the corresponding jut 29 that is connected.

Like this, if necessary, soundproof material or vibroisolating material can append on the part of cover 8, yet, elastic component 24 self can play sound insulation (or vibration isolation) material as mentioned above, like this, the quantity of needed sound insulation (or vibration isolation) material is reduced, therefore, the quantity of required part also reduces significantly.

As shown in Figure 1, though use the cover 8 that comprises fan guard 18 and guard shield 19 according to having narrated relevant preferred embodiment in the above-mentioned cluster engine of the present invention, obviously the present invention also can be used for the cover 17 of same engine group.

Fig. 7 is the cross sectional view along the VII-VII line of Fig. 1, shows that the engine main body that is installed in of an alternative embodiment of the invention is a cover 17 on the crankcase 4.The two edges of cover 17 connect with the sidewall 4a of the crankcase that forms gearbox 10, the edge of 4b respectively, form attachment portion 36a, 36b.Straddle on these attachment portions 36a, the 36b with elastomer 24 similar elastic components 37.And under tension state, firmly its two ends are connected on connection jut 38a, the 38b of the last shaping of crankcase side wall 4a, 4b.As a result, attachment portion 36a, 36b are connected closely by the tension force of elastic component 37.

In this embodiment, when attachment portion 36a, 36b connect by single elastic component 37, the two ends of elastic component 37 respectively with the side of engine main body, promptly sidewall 4a is connected with sidewall 4b.Yet as long as attachment portion 36 is connected, the two ends of elastic component 37 can be connected on sidewall 4a and the cover 17 respectively.

According to the present invention, as long as be connected to the first cover part and the second cover part respectively, or during the engine main body of cover part and elastic component two ends adjacency, two cover parts can be connected closely when the two ends of elastic component.As a result, there is no need along the attachment portion many links to be installed, for example screw just can make ease of connection ground finish soon.The quantity of part can be reduced significantly.

In addition, elastic component itself can play the effect of sound insulation or vibroisolating material, and these sound insulations of installation or the needed number of spare parts of vibroisolating material can be reduced, thereby can make the designs simplification of engine hood.

Claims

1. engine hood, it is made of two cover parts that link together.It is characterized in that: the tabular elastic component of being made by rubber strides across ground, the attachment portion setting that the first cover part and second covers part, the above-mentioned first cover part and the second cover part covering engine main body are with respect to above-mentioned two cover parts, under tension state, fix the two ends of this elastic component, the mounting portion of above-mentioned elastic component is set in the two side portion of engine main body one side of above-mentioned two cover parts.