CN1085778C

CN1085778C - Cooling mechanism for engine of motorcycle

Info

Publication number: CN1085778C
Application number: CN96110011A
Authority: CN
Inventors: 原田周次
Original assignee: Yamaha Motor Co Ltd
Current assignee: Yamaha Motor Co Ltd
Priority date: 1996-03-05
Filing date: 1996-05-29
Publication date: 2002-05-29
Anticipated expiration: 2016-05-29
Also published as: JPH09242543A; JP3484501B2; IN189659B; ID16127A; CN1158939A; MY120898A

Abstract

An under born type motor cycle 1 which can improve the cooling performance of an engine by increasing quantity of cooling air is provided with a car body frame, which includes a head pipe 2 and a down tube 3, and an engine 12 having a cylinder 12a, which is extended forward in the nearly horizontal direction, is arranged under the down tube 3, and a part from over the down tube 3 to both sides of the engine 12 is covered with a leg shield 34a. In this motorcycle 1, a baffle plate 35, which is inclined backward so as to guide the traveling air to the cylinder 12a, is provided under the down tube 3. With this structure, besides the traveling air, which directly collides with the cylinder 12a of the engine 12, the traveling air, which flows over the cylinder 12a, is guided for cooling to the cylinder 12a by the baffle plate 35, and quantity of cooling air is increased so as to improve the engine 12 cooling performance.

Description

The cooling mechanism of engine of motorcycle

The present invention relates to a kind of cooling mechanism of engine of motorcycle.

In the past, as motorcycle, have by the preceding pipe that is supporting handle free to rotately, below aforementioned pipe down, dispose motor with the vehicle frame that following pipe constituted from this preceding pipe towards the downward-sloping extension in car body rear, cover by the support protecting cover from the position of managing top to motor both sides down, the motorcycle of this structure, motor mainly are by cooling off with walking wind that cylinder directly contacts.

Yet as the motor of this motorcycle, owing to be to adopt four stroke engine, in general, therefore four stroke engine, is necessary to improve the cooling performance of four stroke engine than the temperature height of two stroke engine.

Given this, the purpose of this invention is to provide a kind of engine of motorcycle cooling mechanism that can strengthen cooling air quantity, improve the engine cooling performance.

The invention provides a kind of cooling mechanism of engine of motorcycle, this motorcycle has by the preceding pipe that is supporting handle free to rotately, the vehicle frame that following pipe constituted with pipe downward-sloping extension towards the rear before this, and, before aforementioned pipe below disposing and having the motor that general plan forward becomes horizontally extending cylinder, the top of following pipe is covered by the support protecting cover to the position of motor both sides, its improvement is, at the aforementioned downside of pipe down, and above cylinder, be provided with the wind deflector of downward-sloping towards the rear aforementioned cylinder that walking wind is led.

Therefore, according to the present invention, because not only cylinder directly contact with walking wind, and mobile walking wind also can be by the wind deflector cylinder that leads above cylinder, so that cooled engine, thereby, the cooling air quantity increase, the cooling performance of motor is improved.

In addition, owing to being covered from the front lower place by wind deflector, the component in pipe and car body cover down stash, be invisible from the outside, so beautified the outward appearance of car body, simultaneously, avoided muddy water etc. to be attached on the component in the car body lid, particularly, flowing of walking wind can not cause disorder by the component in pipe and car body cover down, can be successfully walking wind guiding cylinder, and the effective supply motor is to cool off.

Fig. 1 is the profile that has the motorcycle of engine cooling of the present invention mechanism.

Fig. 2 is the partial front figure that has the motorcycle of engine cooling of the present invention mechanism.

Fig. 3 is the partial side sectional view that the wind deflector that has a motorcycle of engine cooling of the present invention mechanism is provided with portion.

Fig. 4 is the sectional view in Fig. 3 A-A cross section.

Fig. 5 is the stereogram of wind deflector.

Below, embodiment of the invention will be described with reference to drawings.

Fig. 1 is that the profile Fig. 2 that has a motorcycle of engine cooling of the present invention mechanism is the partial front figure of same motorcycle, Fig. 3 is the partial side sectional view that same motorcycle wind deflector is provided with portion, Fig. 4 is the sectional view in Fig. 3 A-A cross section, and Fig. 5 is the stereogram of wind deflector.

In the motorcycle 1 shown in Fig. 1,2 expressions are positioned at the preceding pipe on top, car body the place ahead, and following 3 the pasts of pipe will be managed 2 places (Fig. 1's is right-hand) diagonally extending down rearward, and its diameter is bigger.And left and right a pair of seat crossbeam 4 is from managing extensions that be inclined upwardly towards the rear of 3 rearward end down, preceding pipe 2, down manage 3 and a crossbeam 4 form vehicle frame together.

Control lever shaft 5 can be inserted in the above-mentioned preceding pipe 2 with rotating freely, and handle 6 is connected with the upper end of control lever shaft 5, and the upper end portion of the lower end of control lever shaft 5 and front fork 7 links, and front-wheel 8 can be supported on the underpart of front fork 7 freely to rotate by axle.And the top of front fork 7 is covered with by mudguard wing 9, and the first half of front-wheel 8 is covered by front fender 10.

In addition, at the aforementioned rear portion of pipe 3 down, be welded with the postbrachium carriage 11 of slightly L-shaped bending, four stroke engine 12 is installed in postbrachium carriage 11 and manages on 3 down, and is supported by both.This four stroke engine 12 have under manage 3 below before the car body general plan become horizontally extending cylinder 12a, on this cylinder 12a, form several cold sinks 12a-1 that extends along the car body fore-and-aft direction.In addition, in the crankcase 12b bottom of motor 12, form food tray, and the bottom of motor 12 is protected by underscreen 13.In addition, in Fig. 1,14,15 expression pedals, 16 expression master brackets, 17 expression side supports.

In addition, in the motorcycle 1 of present embodiment, to pipe 2 before aforementioned and down the guesset 18 that increased of the linking department of pipe 3 constitute air aspiration cavitys, as shown in Figure 2, left and right a pair of sucking pipe 1 is derived from this guesset 18, and sucking pipe 19 joins with the air cleaner 20 of broad.And the bottom of air cleaner 20 links to each other with Carburetor 21 by sucking pipe 22, and this Carburetor 21 joins by the air suction way (not shown) of sucking pipe 23 and aforementioned cylinder 12a.Outlet pipe 2 is derived from the below of cylinder 12a.

On the other hand, above motor 12, be provided with the file type vehicle seat 25 that supports by seat crossbeam 4, below vehicle seat 25, setting fuel tank 26 and battery pack 27.

Again, the front end of postbrachium 28, but by pivot 29 easy on and off rotationally pivotal support on aforementioned postbrachium carriage 11, so trailing wheel 30 can be supported on the rear portion of postbrachium 28 by axle with rotating freely, postbrachium 28 and trailing wheel 30 are suspended on the car body by the posterior bumper 31 that is installed between aforementioned seat crossbeam 4 and the postbrachium 28.And the first half of trailing wheel 30 is covered by back shroud 32.In addition, in Fig. 1,33 expression chain boxes are used to cover the chain (not shown) that the rotary motive power of motor 12 is passed to trailing wheel 30.

Further, motorcycle 1 with said structure, the car body lid 34 that is formed from a resin covers, pipe 3 support protecting cover 34a and the latter half of bonnet 34b of covering body to position, motor 12 both sides form this car body lid 34 by covering down, and support protecting cover 34a forms with 34a-3,34a-4 and cover 34a-5 by being divided into the left and right sides two-part single face lid 34a-1,34a-2.

And, in the motorcycle 1 of present embodiment,, and above the cylinder 12a of motor 12, being provided with wind deflector 35 at the aforementioned downside of pipe 3 down, wind deflector 35 is along pipe 3 is downward-sloping towards the car body rear down.

Below, describe the structure and the mounting structure of above-mentioned wind deflector 35 in detail with reference to Fig. 3～Fig. 5.

As shown in Figure 5, wind deflector 35 is made the slightly integral body of rectangular flat shape by resins such as vinyl chloride, its two end part are integrally formed into the thin-walled tongue piece 35a of easy bending, at the central part of vehicle-width direction, form length along the car body fore-and-aft direction and circular arc camber shape recess 35b that be consistent with following pipe 3 outer shape.

On the front end of wind deflector 35, erectly be provided with left and right a pair of this bracket of bracket 35c 35c and be parallel to each other, interval between the two is greater than the external diameter of managing 3 down, and all is formed with rectangular through-hole 35c-1 on each bracket 35c.In addition, in the substantial middle portion of wind deflector 35 length directions, form with aforementioned recess 35b be clipped in the middle about two elongated band through hole 35d.The next door of a band through hole 35d therein, what form the spark coil (not shown) withdraws from hole 35e, and this withdraws from hole 35e and is blocked by spark coil.

In addition, as shown in Figure 4,, be welded with the metal crooked shape of falling L carriage 36 downwards in the both sides of managing 3 down.

Further, as shown in Figures 3 and 4, wind deflector 35 squeezes retaining makes down pipe 3 embed above the wind deflectors 35 the formed aforementioned recess 35b from the below at aforementioned pipe 3 down, and the carriage 36 that will descend pipe 3 sides passes the through hole 35c-1 of the bracket 35c that is darted on the wind deflector 35, thus, the front portion of this wind deflector 35 is supported on down on the pipe 3 by carriage 36.Moreover, the roughly intermediate portion of wind deflector 35 length directions, utilize pass aforementioned band through hole 35d be with 38, fastening and be supported on down and manage on 3 with line assembling set 39 (with reference to Fig. 4).

But, wind deflector 35 had been installed in before aforementioned brackets protecting cover 34a assembling down on the pipe 3, and like this, under the state before support protecting cover 34a installs, the left and right sides tongue piece 35a of this wind deflector 35 is in the state that is bent downwardly slightly, and towards about we is opening.

So, after this, when support protecting cover 34a will descend pipe 3 with when top mulched ground mode is installed, as shown in Figure 4, the left and right sides tongue piece 35a of wind deflector 35 just contact and bending downwards with the internal surface of the left and right sides single face lid 34a-1, the 34a-2 of support protecting cover 34a, and, make the internal surface sealing of its end and single face lid 34a-1,34a-2 by means of himself elastic force (restoring force).So, earlier wind deflector 35 is installed, afterwards, with the form that covers this wind deflector 35 from the top support protecting cover 34a is covered again, like this, wind deflector 35 and support protecting cover 34a are fitted together hermetically, improved its assembling performance.

And the mounting structure of the cover 34a-5 of support protecting cover 34a is as shown in Figure 3, this cover 34a-5 by the bolt 40 that passes its recess threadably lemon go into to be soldered to down carriage 41 on pipe 3 sides and be installed to down and manage on 3.And support protecting cover 34a is arranged on air cleaner 20 places near aforementioned wider width, and covers with wind deflector 35 between air cleaner 20 and the crankcase 12b.

Further, as shown in Figures 1 and 2, because wind deflector 35 dips down towards the rear and tiltedly is arranged on down pipe 3 downsides, and be positioned at above the cylinder 12a of motor 12, when motorcycle 1 walking, the wind of not only walking directly contacts with the cylinder 12a of motor 12, and also can be with the walking wind guiding cylinder 12a that above cylinder 12a, flows by wind deflector 3, cool off to supply with motor 1, thereby increased cooling air quantity, improved the cooling performance of motor 12.At this moment, because the left and right sides tongue piece 35a of wind deflector 35, be in towards below not only contact under the crooked state with the internal surface sealing of support protecting cover 34a, and the pressure effect of the wind of can being walked and more closely contacting with the sealing of the internal surface of support protecting cover 34a, thereby, improved the sealing of wind deflector 35 with respect to support protecting cover 34a, make above cylinder 12a the walking wind that flows can be from support protecting cover 34a side leakage, and the cylinder 12a that more effectively leads cools off to supply with motor 12.And aforementioned brackets protecting cover 34a is arranged on air cleaner 20 places near broad, is covered by wind deflector 35 between air cleaner 20 and the crankcase 12b, makes the walking wind that contacts with the air cleaner 20 cylinder 12a that also can lead, so that motor 12 is cooled off.

Moreover, as shown in Figure 2, the front of support protecting cover 34a, at front-wheel 8 rears opening is arranged, the wider width of the cylinder 12a of the width ratio engine 12 of crankcase 12b some, therefore, by the walking wind of wind deflector 35 guiding cylinder 12a, can direct into the front of crankcase 12b of broad and the food tray of the downside that leads, to accumulate in the food tray oil cooling but.In addition, between the bottom of crankcase 12 and underscreen 13, form the gap that walking wind can pass through.

By above result, can increase the cooling air quantity of supply engine 12, even the motor of present embodiment 12 adopts four stroke engine, also can cool off effectively, and can cool off the oil that accumulates in the interior food tray of crankcase 12b effectively.

And, owing to pipe 3 and body cap 34 interior component are covered also under cover from the front lower place by wind deflector 35 down, so, cannot see these component from the outside, beautified the outward appearance of car body, simultaneously, can prevent that muddy water etc. is bonded on the component in the car body lid 34, and, walking wind flow not can by manage down 3 and car body lid 34 in component cause disorder, the cylinder 12a of the motor 12 but wind of will walking successfully leads, supply engine 12 is to cool off effectively.

By above illustrating as can be seen, have by the preceding pipe that can support handle according to motorcycle provided by the present invention with rotating freely, the vehicle frame that following pipe constituted with pipe downward-sloping extension towards the rear before this, below following pipe, disposing and having the motor that general plan forward becomes horizontally extending cylinder, cover by the support protecting cover from the position of managing top to motor two sides down, and, at the aforementioned downside of pipe down, and above cylinder, dip down towards the rear and tiltedly be provided with the lead wind deflector of aforementioned cylinder of walking wind, thus, walking wind is directly contacted with cylinder, and the cylinder that can lead by the walking wind that wind deflector flows the cylinder top, so that motor is cooled off, increased cooling air quantity and reached the effect that improves the engine cooling performance.

Moreover, according to the present invention, component in following pipe and the car body lid are covered from the front lower place by wind deflector, make it under cover, cannot see these component from the outside, like this, beautified the outward appearance of car body, can prevent that again muddy water etc. is bonded on the component in the car body lid, particularly, flowing of walking wind can not cause disorder by the component in pipe and the car body down, reaches the wind of guaranteeing to walk lead the smoothly cylinder of motor, the effect of cooled engine effectively.

Claims

1. the cooling mechanism of an engine of motorcycle, described motorcycle has the vehicle frame that following pipe constituted by the preceding pipe that is supporting handle and pipe downward-sloping extension towards the rear before this free to rotately, below aforementioned pipe down, disposing and having the motor that general plan forward becomes horizontally extending cylinder, the position of the top of following pipe to motor two sides is covered by the support protecting cover, it is characterized in that, at the aforementioned downside of pipe down, and above the cylinder of aforementioned motor, dipping down towards the rear tiltedly is provided with the lead wind deflector of aforementioned cylinder of walking wind.