CN1935585B - Low floor type motorcycle - Google Patents

Abstract

A motorcycle with a low floor is configured such that secondary vibration of an engine can be largely reduced and an increase in engine width can be suppressed. The motorcycle with a low floor includes step floors on which to put a rider's feet on left and right sides of a vehicle body frame. An engine is provided between the step floors. A plurality of exhaust pipes extend respectively from cylinders of the engine, the exhaust pipes being gathered at a gathering portion. The engine is an in-line 3-cylinder engine having cylinder portions inclined forwardly. The exhaust pipes extend downwards from the cylinder portions on the basis of each cylinder. The exhaust pipes are bundled and extend on the right side of the engine, in a position on the lower side of one of the step floors.

Description

Low floor type motorcycle

The cross reference of related application

All in the Japanese patent application Nos.2005-274347 of 21 propositions September in 2005 and the preceence of 2005-274550, described patent application full content is bonded to here the application by reference according to 35U.S.C. § 119 requirements.

Technical field

The present invention relates to low floor type motorcycle, described motor bike has: be used to cover vehicle body frame the cover member, be positioned at the driving engine of the downside of cover member, the freeing pipe that extends from the cylinder of driving engine respectively, described freeing pipe collects in the portion of compiling.

Background technology

Known a kind of low floor type motorcycle, described motor bike have the driving engine (for example, with reference to the open No.2002-79982 (Fig. 2) of Japanese patent unexamined) that is used to cover the cover member of vehicle body frame and is positioned at the downside of cover member.

In Fig. 2 of the open No.2002-79982 of Japanese patent unexamined, motor bike 1 comprises vehicle body frame 2, and the engine unit 41 (below abbreviate driving engine 41 as) that hangs on vehicle body frame 2.

Driving engine 41 is double-cylinder engines, comprises balancing device axle 67 (below be called balance shaft 67), and this balance shaft on the cooperation plane between the crankcase 48, is positioned at the upside of bent axle 61 at cylinder block 47.

The balance shaft 67 that is equipped with for double-cylinder engine recited above generally is the main balance shaft that is used to reduce elementary vibration.When being equipped with balance shaft 67, can reduce the elementary vibration of driving engine 41 for double-cylinder engine.

Yet in this engine type, although can utilize balance shaft to eliminate elementary vibration, secondary vibration still intactly remains.Consequently, in the low floor type motorcycle of the external component with resin manufacture, the secondary vibration that driving engine 41 produced can be delivered on the cover member of a part that for example constitutes external component etc., causes that cover member etc. produces noise.

There is a kind of method in countermeasure as the vibration of tackling external component, in the method, is being used for the supporting structure of driving engine, adopts the rubber connecting element, so that isolate the vibration of driving engine.But in this case, the number of parts increases, because in order to carry out high-speed operation, need the member of independent increase vehicle rigidity etc.

Simultaneously, in order to reduce secondary vibration, the number that increases the cylinder of driving engine is an actv..For example, when quadruple cylinder engine is used for low floor type motorcycle, can reduce secondary vibration, but, use four cylinders or six-cylinder engine, can make too many that the width (here and after, refer to the side of the driving engine on the vehicle-width direction) of driving engine increases, thereby be difficult to keep form as the low floor type motorcycle of small motorcycle type with low.

In addition, known a kind of low floor type motorcycle, wherein, freeing pipe extends respectively and is integrated into set portion from the cylinder of driving engine (for example, sees the open No.Hei11-99980 (Fig. 2) of Japanese patent unexamined.)

Fig. 2 of the open No.Hei 11-99980 of Japanese patent unexamined is the planar view of motor bike with base plate of low floor type, wherein, motor bike 1 has horizontal opposed type explosive motor 3 (back is called driving engine 3), left cylinder 4l that driving engine 3 is had and right cylinder 4r are configured in the front side of left bottom plate 2l and right base plate 2r respectively, freeing pipe 32r rearward extends from cylinder 4r, freeing pipe 32l rearward extends from cylinder 4l, freeing pipe 32l extends to freeing pipe 32r side, and union is incorporated on the freeing pipe 32r.

But, owing to extending to freeing pipe 32r side union, the freeing pipe 32l that rearward extends is incorporated on the freeing pipe 32r, so, need guarantee enough spaces at the rear side of driving engine 3, for example, guarantee enough intervals at freeing pipe 32l and between the back vent 14 that allows to swing up and down (below be called rear-swing arm 14).

In addition, because freeing pipe 32l and 32r extend towards the rear side of driving engine 3, so the position that freeing pipe 32l and freeing pipe 32r gather set portion together is limited in the rear side of driving engine 3.Therefore, must be positively the length setting of each freeing pipe from each cylinder of driving engine 3 to set portion be become to be not less than predetermined value.In addition, as in the prior art, extend at one of freeing pipe under the situation of another one freeing pipe side, can produce restriction for the adjusting of the tractive performance between the cylinder; For example, the length between freeing pipe can produce very big difference.

Consider problem recited above, need a kind of technology, can reduce the secondary vibration of driving engine widely by this technology, and can suppress the increase of driving engine width.And then, needing a kind of low floor type motorcycle, it need not to be provided at the space of the rear side configuration freeing pipe of driving engine, and can regulate tractive performance between the cylinder with flexible way.

Summary of the invention

The objective of the invention is to make a kind of low floor type motorcycle, make it possible to the secondary vibration of driving engine is reduced to bottom line, in the space that the rear side of driving engine need not to be provided for disposing freeing pipe, and can regulate tractive performance between the cylinder with flexible way.

According to a first aspect of the invention, a kind of low floor type motorcycle comprises: at the step base plate on the left side and the right side of vehicle body frame, driver's pin is placed on this step base plate; The cover member is arranged between the step base plate, so that cover vehicle body frame; Be arranged on the driving engine of the downside of cover member; And a plurality of freeing pipes that extend out from the cylinder of driving engine respectively, described freeing pipe is in the place's polymerization of set portion.Driving engine is the inline type three-cylinder engine, has bevelled cylinder portion forwards.

According to a second aspect of the invention, engine configurations has balance shaft, is used to reduce elementary coupling vibration.

According to a third aspect of the present invention, vehicle body frame comprises: the in the past upper component that extends to the upside of driving engine of pipe, the pipe lower member of extending in the past to the cross side of the cylinder portion of driving engine, and driving engine is supported by the bottom of lower member.

According to a fourth aspect of the present invention, driving engine directly is fixed on the vehicle body frame, between without any elastic component.

According to a fifth aspect of the present invention, the cover member is arranged between the step base plate, is used to cover vehicle body frame, and engine configurations is at the downside of cover member, and a plurality of freeing pipes extend out from the cylinder of driving engine respectively, and freeing pipe is gathered in set portion.Freeing pipe is with the state configuration of the bunchy downside one of in the step base plate on left side and right side.

According to a sixth aspect of the invention, set portion is configured in the downside of step base plate.

According to a seventh aspect of the present invention, driving engine is a watercooled engine, and the cooling water pipe that is used for driving engine is configured in an other side opposite with a side that disposes freeing pipe.

According to an eighth aspect of the present invention, driving engine is equipped with cooling water pump, and in plan view, for the vertical center line of vehicle, cooling water pump is configured in the opposition side on the left and right directions of freeing pipe.

According to a ninth aspect of the present invention, driving engine has bevelled cylinder portion forwards, and freeing pipe extends downwards from cylinder portion at the base portion of each cylinder, and freeing pipe is by bunchy and extend to the left side of driving engine and the side in the right side.

According to a tenth aspect of the present invention, near set portion, blow off valve is set, is used for regulating aperture area according to condition of service.

The effect of invention

According to a first aspect of the invention, driving engine is the inline type three-cylinder engine, thereby, for example to compare with the inline type two cylinder, the displacement of each cylinder is less, the vertical motion parts in each cylinder, lighter such as the weight of connecting rod and piston etc.In addition, be used for the balance weight of crank, can reduce the elementary vibration of the driving engine that the vertical motion by piston etc. causes by adjusting.And then, can reduce the secondary vibration of the driving engine that the side-to-side movement by connecting rod, piston pin etc. causes.By the secondary vibration of such reduction, can improve the comfort level in operational process.

And, owing to can reduce secondary vibration, so, in the low floor type motorcycle that has in a large number such as the external components such as vehicle body cover of resin manufacture, for example, can reduce the vibration of carrying out with the frequency that externally produces noise easily on the parts.

Simultaneously, even in low floor type motorcycle,, also can reduce secondary vibration if can use four cylinders or six-cylinder engine as small size motorcycle.But, four cylinders or six-cylinder engine are applied to low floor type motorcycle, make it to be difficult to keep the form of small size motorcycle, because need guarantee the width of driving engine.

From this viewpoint, in the present invention, driving engine is the inline type three-cylinder engine, thereby width that will driving engine enlarges too much, can keep the form of small size motorcycle.

Thereby, by adopting the inline type three-cylinder engine, can obtain low floor type motorcycle, make it possible to reduce secondary vibration to a great extent, and do not enlarge the width of driving engine too much.

And then, because driving engine has bevelled cylinder portion forwards, so can accomplish to reduce the center of gravity of vehicle.By lowering the center of gravity like this, can improve manoevreability.

According to a second aspect of the invention, be provided for reducing the balance shaft of coupling vibration, thereby, the elementary coupling vibration that the vibration phase difference between left side and the right side causes can be reduced.

Owing to can reduce elementary coupling vibration like this, so the elementary coupling vibration that has suppressed to be produced from the transmission of driving engine to vehicle body frame, can further improve the comfort level in operational process by this.

According to a third aspect of the present invention, vehicle body frame comprises the upper component of the upside that extends to driving engine and extends to the lower member of the cross side of cylinder portion, thereby, in the low floor type vehicle, can be with engine configurations in low position, guarantee the rigidity that is connected between vehicle body frame and the driving engine simultaneously.

In addition, because driving engine is by the bottom of lower member supporting, so, Assembly ﹠Disassembly driving engine at an easy rate.

According to a fourth aspect of the present invention, driving engine is fixed directly on the vehicle body frame, can guarantee the vehicle body rigidity of being scheduled to adopt so-called diamond type vehicle frame simultaneously, in this arch bar truck, with the part of driving engine as vehicle body frame.In addition, can give vehicle body frame with the transfer of vibration of driving engine so that be difficult to.

Owing to improved the rigidity that is connected between driving engine and the vehicle body frame, and can must be lower with engine configurations, with the position optimization of center of gravity, therefore, can further improve the drive ability of low floor type vehicle by this.

Consequently, in operational process, particularly in the high-speed cruising process, can improve comfort level to a great extent.

According to a fifth aspect of the present invention, with a plurality of freeing pipe bunchys, thereby freeing pipe can be focused on the left side and a right side side wherein of vehicle body frame, rather than they are scatter each other.Because freeing pipe can be focused on the left side and a right side side wherein of vehicle body frame, so, driving engine space on every side can be saved.

In addition, because freeing pipe is configured in the downside of step base plate, so, can improve the presentation quality of motor bike.

Owing to can therefore freeing pipe be concentrated on the left side of vehicle body frame and the side in the right side,, can effectively utilize the freeing pipe space of driving engine rear side so freeing pipe can not pass through at the rear side of driving engine.Because can utilize the freeing pipe space of driving engine rear side with imitating, so, can improve the degree of freedom when design vehicle, for example, can improve the degree of freedom of the layout of rear-swing arm.

According to a sixth aspect of the invention, set portion is configured in the downside of step base plate.

In low floor type motorcycle, at the downside of step base plate the cross section being set is leg-of-mutton space, and this space is limited by the side surface of driving engine and the surface institute that is used for fixing angle of roll, thereby, can freely set portion be configured in the downside of step base plate.Therefore owing to having improved the degree of freedom of configuration set portion, so, for example, can freely set the length of each freeing pipe from each cylinder to set portion.If can freely set freeing pipe to set minister degree, then can easily carry out the adjusting of the tractive performance between the cylinder, can improve the design-calculated degree of freedom.

According to a seventh aspect of the present invention, waste pipe is with the state configuration of the bunchy downside at one of a left side and right step base plate, and, be configured in the downside of another step base plate for the cooling water pipe of driving engine outfit.

Because cooling water pipe and freeing pipe are configured in the downside of a left side and right step base plate respectively, so the freeing pipe that will be in higher temperature disposes away from cooling water pipe, by this, can improve cooling effectiveness.

According to an eighth aspect of the present invention, the cooling water pump that is used for driving engine is configured in the opposition side of left and right directions of the freeing pipe of plan view.

Because cooling water pump and freeing pipe are configured in the downside of a left side and right step base plate respectively, so, can make cooling water pump and freeing pipe spaced apart fully.

When cooling water pump and cooling water pipe are configured in the downside of same step base plate, can dwindle the length that cooling water pipe extends out from cooling water pump, by this, can accomplish to reduce the weight of vehicle.

According to a ninth aspect of the present invention, driving engine has bevelled cylinder portion forwards, and freeing pipe extends downwards from cylinder portion at the base portion of each cylinder, thereby, can accomplish to reduce the center of gravity of vehicle.

Because can therefore accomplish to reduce the center of gravity of vehicle, so, manoevreability can be improved more.

In addition, because waste pipe is by bunchy and extend to the left side of driving engine and the side in the right side, so, can easily freeing pipe be configured in cross side at driving engine.

In addition, because driving engine has bevelled cylinder portion forwards, so can must be lower with engine configurations.Since therefore can must be lower with engine configurations, so can guarantee to be positioned at the space broad that the leg on the cover member passes through.

According to a tenth aspect of the present invention, in invention as claimed in claim 6, the set portion of freeing pipe set is configured in the downside of step base plate, and, be configured for regulating the blow off valve of a part of the control mechanism of aperture area according to condition of service, be arranged on set portion near, thereby, by regulating the position of set portion on fore-and-aft direction, blow off valve can be configured in set portion near, and need not to enlarge the width of vehicle.

By detailed description given below, further field of application of the present invention will become apparent.But, be to be understood that, following detailed and specific example, although pointed out the preferred embodiment of invention, but just provide in the mode of example, because by the detailed description here, for those skilled in the art, various changes in the spirit and scope of the invention and remodeling will be fairly obvious.

Description of drawings

By description given here and the accompanying drawing that only provides in the mode of example, will be understood more fully the present invention, explanation of being done and accompanying drawing are not limitation of the present invention here, wherein:

Fig. 1 is the cutaway view according to the right side of low floor type motorcycle of the present invention;

Fig. 2 is the front elevation that is used for illustrating the configuration of components around low floor type motorcycle driving engine according to the present invention;

Fig. 3 is the cutaway view according to the main portion of low floor type motorcycle of the present invention;

Fig. 4 is the cutaway view along the 4-4 line intercepting of Fig. 3;

Fig. 5 is the view that the arrow along Fig. 4 obtains;

Fig. 6 is the cutaway view along the 6-6 line intercepting of Fig. 4;

Fig. 7 is the right side view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention;

Fig. 8 is the upward view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention;

Fig. 9 is the left side view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention;

Figure 10 is the transparent view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention;

Figure 11 is the cutaway view along the 11-11 line intercepting of Figure 10;

Figure 12 is arranged on according to the planar view of the blow off valve in the low floor type motorcycle of the present invention (part sectional view);

Figure 13 is used for illustrating the lateral plan that is arranged on according to the Poewr transmission mechanism of low floor type motorcycle of the present invention;

Figure 14 is along the cutaway view of the 14-14 line intercepting of Figure 13;

Figure 15 is used for illustrating the transparent view that is arranged on according to the Poewr transmission mechanism of low floor type motorcycle of the present invention;

Figure 16 (a) is used for illustrating the cutaway view that is arranged on according to the Poewr transmission mechanism of low floor type motorcycle of the present invention, and Figure 16 (b) represents comparative example.

The specific embodiment

In the following description, term " preceding ", " back ", " left side ", " right side ", " on " and D score refer to side or the direction of seeing when observing by the driver.

Fig. 1 is the cutaway view according to the right side of low floor type motorcycle of the present invention.Motor bike 10 is a kind of vehicles that comprise vehicle body frame 11, and it comprises: the preceding pipe 13 that is arranged on the leading section of vehicle 12; Be arranged on the upside of driving engine 14 and manage 13 upper components 16,16 (only expressing the label 16 of viewer's side) that rearward extend in the past; The seat slide 18,18 (only expressing the label 18 of viewer's side) that rearward on the skew extends up from upper component 16,16; Bearing support 19,19 (only expressing the label 19 of viewer's side) from downside supporting base seat rail 18,18; From upper component 16,16 branches, the cross side of cylinder block 23 that is positioned at driving engine 14 and the lower member 17,17 (only expressing the label 17 of viewer's side) of extending downwards; Floor bracket 26,26, described floor bracket 26,26 is also rearward extended from the top of upper component 16,16, so that step base plate 25,25 (only expressing the label 25 of viewer's side) is installed thereon.

Pivot 28 is installed on the upper component 16,16, and it can be that swing vertically at the center with pivot 28 that rear-swing arm 31 is mounted to, and back buffer cell 32 is installed between rear-swing arm 31 and the vehicle body frame 11.

In addition, motor bike 10 is a kind of like this vehicles, in this vehicle, on the pipe 13, front-wheel 36 was rotatably installed in the lower end of front fork 35 before front fork 35 can be installed in with turning to, and steering tiller 37 is installed in the top of front fork 35, driving engine 14 is configured in the space that is formed between upper component 16 and the lower member 17, trailing wheel 39 is rotatably installed in the rear end of rear-swing arm 31, and the Power train 42 that comprises axle drive shaft 41 is between driving engine 14 and trailing wheel 39, so that drive trailing wheel 39.

That is, motor bike 10 comprises: vehicle body frame 11, be installed in the rear-swing arm 31 on the vehicle body frame 11, the Power train 42 that is fixed to the driving engine 14 on the vehicle body frame 11 and propulsive effort is passed to trailing wheel 39 from driving engine 14 by axle drive shaft 41 swingably by pivot 28.

The main body of driving engine 14 comprises crankcase 43 and is installed in cylinder block 23 on this crankcase 43 with bevelled state forwards.Driving engine 14 is inline type three-cylinder engines of water-cooling type, at the downside of cylinder block 23 and the rear side of front-wheel 36, is equipped with radiator portion 44.

Cylinder block 23 is provided with cylinder portion 45, and each cylinder portion has columniform inside face.The number of cylinder portion 45 is three.

Airfilter unit 46 constitutes the part of the air system that will describe.

Airfilter unit 46 comprises: the air intake chamber 47 of pipe 13 front side before being arranged on, first Room 48 of downside that is arranged on air intake chamber 47 and second Room 49 that is arranged on the rear side of first Room 48 have connection pipe 50 between them.The parts (not shown) that at first is set in first Room 48 by air intake chamber 47 inlet airs purifies, and the air that is cleaned then is directed to second Room 49 by connection pipe 50, and is last, and the air that purifies is supplied to driving engine 14 from second Room 49.

Front side and rear side by pipe 13 before like this airfilter unit 46 being disposed at can obtain enough capacity, and airfilter unit 46 can be configured in driving engine 14 near.

Now exhaust system will be described.Downtake pipe 51, second exhaust pipe 52 and the 3rd freeing pipe 53 are connected on the cylinder block 23 that inline type three-cylinder engine 14 had, first to the 3rd freeing pipe 51 to 53 rearward extends, first to the 3rd freeing pipe 51 to 53 is in the set of set portion 54 places of the rear side that is arranged at these freeing pipes 51 to 53, and silencer 55 is connected to the rear side of set portion 54.

Cover member 61 is the members that are used to cover the part of vehicle 12, and, also play a part shroud member.Cover member 61 comprises: front shroud member 62 is used to cover the front portion of vehicle body frame 11, pipe 13 etc. before described front portion comprises; Intermediate cap member 63 is arranged on the rear side of front shroud member 62; And back cover member 64, be arranged on the rear side of intermediate cap member 63, so that cover the rear section of vehicle 12.

Here, intermediate cap member 63 is a kind of like this members, leg is set by space 65 at the upside of this intermediate cap member, be used for when driver's steering vehicle 12 or when vehicle 12 gets off, driver's leg is passed through, and driving engine 14 is arranged on the downside of this intermediate cap member 12.Thereby driving engine 14 is arranged on the downside of leg by space 65, and when driver's steering vehicle 12 or when vehicle 12 gets off, described leg is used to make driver's leg to pass through by space 65.

Step base plate 25,25 (only expressing the label 25 of viewer's side) is mounted in the member on the floor bracket 26,26 of a part that constitutes vehicle body frame 11, and is the pin rest portion that driver's pin is placed on it in operational process.

Specifically, a plurality of freeing pipes 51 to 53 are arrived together by bunchy, and are configured in the downside of step base plate 25, and freeing pipe 51 to 53 is disposed at the downside of step base plate 25 by the set portion 54 of the position of bunchy.

The blow off valve 67 that can suppress the exhaust flow velocity be arranged on set portion 54 near.Blow off valve 67 is one of composition members of emission control 70.

Emission control 70 comprises: thus according to condition of service regulate aperture area blow off valve 67, be used to open and close blow off valve 67 operating line 71 and 72, be used to drive the servomotor 73 of operating line 71 and 72 and be used to control servomotor 73 so that regulate the control unit 74 of the flow velocity of exhaust.

Also express connecting rod mechanism 76, fuel tank 77, the fuel charger between back buffer cell 32 and rear-swing arm 31, the storage vessel 79, preceding brake unit 81, Hooke's coupling 82, operator's seat 83, the main support 86 that are used for back buffer cell 32 and the helmet 87 that is contained in baggage container among the figure.

Fig. 2 is the front elevation that is used for illustrating in the layout of low floor type motorcycle driving engine according to the present invention parts on every side.Floor bracket 26,26 comprises: from upper component 16, the 16 downward anterior looped pipelines 121,121 that on the skew extend towards left and right direction; From anterior looped pipeline 121, the 121 downward persons in charge 122,122 that on the skew extend towards the rear; The rear portion looped pipeline 123,123 that the rear portion of being responsible for 122,122 rearward end and upper component 16,16 is connected with each other.In addition, base plate member 124,124 is set on the person in charge 121,121, forms step base plate 25,25.

As shown in Figure 1, driving engine 14 is a kind of inline type three-cylinder engines, has bevelled cylinder portion forwards.Driving engine 14 comprises the 45... of cylinder portion (here and after " ... " expression a plurality of), and freeing pipe 51 to 53 extends downwards respectively from the 45... of cylinder portion at the base portion of each cylinder, and subsequently by bunchy, and extends on the right side of driving engine 14.

Because driving engine 14 comprises the 45... of cylinder portion, and freeing pipe 51 to 53 extends downwards respectively from the 45... of cylinder portion at the base portion of each cylinder, so can accomplish to reduce the center of gravity of vehicle 12.

Owing to can therefore accomplish to reduce the center of gravity of vehicle 12, so can improve manoevreability.

In addition, because the freeing pipe 51 to 53 of driving engine 14 is by bunchy and extend to the left side of driving engine 14 and the side in the right side, so can easily freeing pipe 51 to 53 be configured in the cross side of driving engine 14.

Get back to Fig. 1, owing to the cylinder portion 45 of driving engine 14 forwards tilts, so can dispose driving engine 14 lower.Therefore owing to can dispose driving engine 14 lower,, by this, can guarantee to be positioned at space 65 broads that the leg of the upside of cover member 61 passes through so can dispose cover member 61 lower.

Although in the present embodiment, freeing pipe 51 to 53 extends by bunchy and on the right side of driving engine 14,, also can extend with freeing pipe 51 to 53 bunchys and in the left side of driving engine 14.

Fig. 3 is the cutaway view according to the main portion of low floor type motorcycle of the present invention.Driving engine 14 comprises crankcase 43, and cylinder block 23 on the skew forwards extends from crankcase 43, and cylinder head 111 is installed on the cylinder block 23, and food tray 112 is installed on the crankcase 43 from downside.

Bent axle 114 and balance shaft 115 are arranged on cooperating on the plane 113 between cylinder block 23 and the crankcase 43, and cam drive axle 116 is configured in the front side of balance shaft 115, and camshaft 117,117 is arranged on cooperating on the plane 118 between cylinder block 23 and the cylinder head 111.Gear 121,122 is between bent axle 114 and balance shaft 115, gear 123,124 is between balance shaft 115 and cam drive axle 116, cam chain 125 is reeled around cam drive axle 116 and camshaft 117,117, so that the propulsive effort of bent axle 114 is passed to bent axle 117,117.

That is, driving engine 14 is provided with the balance shaft 115 that is used to reduce elementary coupling vibration.Balance shaft 115 will be described in detail in the back.

Use description to the supporting structure of driving engine 14 now.

Driving engine 14 is set at a plurality of support 131a to 131c on the upper component 16 and is arranged on support 132 supportings on the bottom 17b of lower member 17.Driving engine 14 is fixed directly on the support 131a to 131c, 132, between them without any elastic component.

Specifically, vehicle body frame 11 comprises: manage in the past 13 (referring to Fig. 1) extend to driving engine 14 upside upper component 16 and manage 13 lower member 17 of cross side that extend to the cylinder portion 45 of driving engine 14 in the past, and driving engine 14 is comprised support 131a to 131c, 132 supportings of the bottom 17b of lower member 17.

Because vehicle body frame 11 comprises the upper component 16 of the upside that extends to driving engine 14 and extends to the lower member 17 of the cross side of cylinder portion 45, so, driving engine 14 can be configured in low position, in low floor type motorcycle, guarantee simultaneously the rigidity that is connected between vehicle body frame 11 and the driving engine 14.By making driving engine 14 be positioned at low position, can improve the stability of operation.

In addition, the crankcase 114 of Heavy Weight is arranged such that its center is positioned at upside for driver's pin step base plate 25 placed thereon.

Because the top that is centered close to step base plate 25 of crankcase 114, so, by driving engine 14 centers of gravity own are risen to certain degree, can improve manoevreability.

In other words, by driving engine 14 being placed low position and, can further improving drive ability with the position optimization of the center of gravity of driving engine 14.

In addition, because driving engine 14 is by the bottom 17b of lower member 17 supporting, so easily the Assembly ﹠Disassembly driving engine 14.

Because driving engine 14 is fixed directly on the vehicle body frame 11, between them without any elastic component, so, can guarantee the vehicle body rigidity of being scheduled to and adopt so-called arch bar truck simultaneously, in this arch bar truck, driving engine 14 is used as the part of vehicle body frame 11.

Be connected rigidity and must be lower by improving between driving engine 14 and the vehicle body frame 11,, can improve the drive ability of low floor type motorcycle more simultaneously with the position optimization of center of gravity with the set positions of driving engine 14.

Consequently, in operational process, particularly in the high-speed cruising process, can improve comfort level significantly.

Incidentally, can utilize between the elastic component between them (rubber absorbers) driving engine 14 is fixed on the vehicle body frame 11.In this case, utilize the elastic component of high hardness that driving engine 14 is fixed on the vehicle body frame 11, for example, between them, utilize to have hardness, can eliminate more premium-quality vibration by this 80% or above rubber or urethane elastomer.

Fig. 4 is the cutaway view along the 4-4 line intercepting of Fig. 3.The gear 121 that is used for driven equilibrium axle 115 is set at bent axle 114, driven gear 122 is arranged on the balance shaft 115 with gear 121 engagements, the gear 123 that is used for power cam axle drive shaft 116 is arranged on balance shaft 115, with gear 123 engagement and be balanced the gears 124 that axle 115 drives and be arranged on the cam drive axle 116, the sprocket wheel 126 that is used for propulsive effort is passed to bent axle 117,117 is arranged on cam drive axle 116.

Fig. 4 represents Starting motor 135.Being formed at gear 137 on the output shaft 136 of Starting motor 135 and the gear 138 that is arranged on the cam drive axle 116 is meshing with each other.

Balance shaft 115 is the member (see figure 1)s that are used for being reduced in the coupling vibration that driving engine 14 produces.

Balance shaft 115 is provided with a pair of eccentric load on the position away from axle center preset distance, and balance shaft 115 and the rotation of crankshaft reversal ground, thereby eliminates coupling vibration.

Describe balance shaft 115 below with reference to accompanying drawings in detail.

Fig. 5 is the view that the arrow 5 along Fig. 4 obtains, the first weight portion 141 that expression balance shaft 115 is had.

The first weight portion 141 has the half-round that is formed on the axial region 143, thereby forms balance weight.More particularly, the first weight portion 141 has such structure, wherein, as half-round first maintaining part 144 is installed, first maintaining part 144 is provided with 5 cross sections and is circular balance weight mating holes 145..., and balance weight 146... is engaged in the balance weight mating holes 145....

And then, when balance weight 146... forms and be coupled in the maintaining part 144 by highdensity material, can guarantee needed equilibrium value and need not to strengthen half-round.

Fig. 6 is that expression is arranged on the second weight portion 151 on the balance shaft 115 along the cutaway view of the 6-6 line intercepting of Fig. 4.

The second weight portion 151 has the half-round of contiguous axial region 143, thereby forms balance weight.More particularly, the second weight portion 151 has such structure, wherein, as half-round second maintaining part 154 is installed, second maintaining part 154 is provided with cross sectional shape and is 5 circular balance weight mating holes 155..., and balance weight 156... is coupled among the balance weight mating holes 155....

And then, when balance weight 156... forms and be coupled in the maintaining part 154 by highdensity material, can guarantee required equilibrium value and need not to strengthen half-round.

Incidentally, the first weight portion 141 and the second weight portion 151 are round axial region 143 configurations, so that locate and opposite phases.

Get back to Fig. 1, in inline type three-cylinder engine 15, be provided for reducing the balance shaft of coupling vibration, thereby, the elementary coupling vibration that causes by the vibration phase difference between left side and the right side can be reduced.Owing to can reduce elementary coupling vibration, so can suppress the transmission of the elementary coupling vibration that produces by driving engine 14 to vehicle body frame 11.

Owing to reduced the amount that produces and pass to the elementary coupling vibration of vehicle body frame 11 by driving engine 14, so although driving engine 14 is fixed directly on the vehicle body frame 11, the vibration of driving engine 14 still is difficult to pass to vehicle body frame 11.

Because the vibration of driving engine 14 is difficult to pass to vehicle body frame 11, so, in operational process, particularly in the high-speed cruising process, can increase substantially comfort level.

The function of motor bike recited above will be described below.

Because driving engine 14 is inline type three-cylinder engines, for example, compares with the inline type two cylinder, the displacement of each cylinder is smaller, and the weight such as vertical motion parts such as connecting rod and pistons in each cylinder is low weight.In addition, be arranged on balance weight 146,156 around the bent axle 114, can reduce the elementary vibration of the driving engine 14 that the vertical motion by piston etc. causes by adjusting.In addition, can reduce the secondary vibration that the side-to-side movement by connecting rod, piston pin etc. causes.Because can reduce secondary vibration, so, the comfort level in the operational process can be improved.

In addition, in the low floor type motorcycle 10 that comprises much such as cover member 61 external components such as grade of resin manufacture, owing to can reduce secondary vibration, so can reduce with in the vibration that externally produces the frequency of noise on the parts easily.

Simultaneously, even in low floor type motorcycle,, also can reduce secondary vibration if can utilize four cylinders or six-cylinder engine as small size motorcycle.But, in low floor type motorcycle, use four cylinders or six-cylinder engine, owing to need guarantee the width of driving engine, so be difficult to keep the form of small size motorcycle.

From this viewpoint, in the present invention, driving engine 14 is inline type three-cylinder engines, thereby, can keep the form of small size motorcycle, need not to increase the width of driving engine 14 to such an extent that ground is too big.

Thereby, by adopting the inline type three-cylinder engine, can obtain a kind of low floor type motorcycle, it can reduce secondary vibration significantly, and suppresses the increase of the width of driving engine.

And then, because the cylinder portion 45 of driving engine 14 is bevelleds forwards, so, can realize the reduction of the center of gravity of vehicle 12.Lower the center of gravity by accomplishing like this, can improve manoevreability.

Incidentally, although will be used for being applied to the motor bike of present embodiment according to the balance shaft of driving engine of the present invention,, also can be applied to four-wheel motor cycle, and, also can be applied to general vehicle.

Fig. 7 is the right side view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention.The set portion 54 of freeing pipe 51 to 53 set place is configured in the right side of driving engine and is positioned at the downside of step base plate 25, and blow off valve 67 is disposed at the rear side of set portion 54, and silencer 55 is configured in the rear side of blow off valve 67.By stay member 111 is hung down and silencer 55 is installed on the stay member 111 from bearing support 19, silencer 55 and vehicle body frame 11 are formed one.

Place along bearing support 19 from the operating line 71 and 72 that blow off valve 67 extends, be used to drive the servomotor 73 of operating line 71 and 72 and the rear portion 19b that control unit 74 is installed in bearing support 19.

Fig. 8 is the upward view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention.Radiator portion 44 is configured in the front side of driving engine 14, and radiator portion 44 and driving engine 14 are interconnected by cooling water pipe 112.The output shaft of label 113 expression driving engines 14, the spring of 114 expressions between main support 86 and vehicle body frame 11.

Incidentally, omitted Power train in the drawings.

The freeing pipe 51 to 53 of bunchy is configured in the downside of the step base plate 25 on right side, and set portion 54 is configured in the downside of right step base plate 25, thereby, can guarantee enough spaces 115 at the rear side of driving engine 14.Therefore, can utilize the freeing pipe space of driving engine 14 rear sides, need not to consider the interference between freeing pipe 51 to 53 and the rear-swing arm 31 (referring to Fig. 1), and under the conventional situation of the rear side that freeing pipe 51 to 53 is extended to driving engine 14, need consider this problem.

In other words, driving engine 14 is watercooled engine, and freeing pipe 51 to 53 is put downside at the step base plate 25 on right side with the state of bunchy, is placed in the downside of the step base plate 25 in left side for the cooling water pipe 112 of driving engine 14 configurations.

Incidentally, can adopt such structure, in this structure, the freeing pipe 51 to 53 of bunchy places the downside of the step base plate 25 in left side, and cooling water pipe 112 is placed at the downside of the step base plate 25 on right side.

That is, the freeing pipe 51 to 53 of driving engine 14 is with one the downside of state configuration in left side and right side step base plate 25,25 of bunchy, and the cooling water pipe 112 that is used for driving engine 14 places another downside of left side and right side step base plate 25,25.

Because need avoid the temperature build-up of cooling water expansion tank, so, must make freeing pipe 51 to 53 and cooling water pipe 112 spaced apart.

In the present invention, cooling water pipe 112 and freeing pipe 51 to 53 place the downside of a left side and right step base plate 25,25 respectively, thereby the freeing pipe 51 to 53 that is in higher temperature is disposed away from cooling water pipe 112, can improve cooling effectiveness by this.

Driving engine 14 is equipped with cooling water pump 116, and for the line of centers 119 of the vehicle in the plan view, cooling water pump 116 is configured in the opposition side on the left and right directions of freeing pipe 51 to 53.

Owing to need avoid the temperature build-up of cooling water expansion tank, must make freeing pipe 51 to 53 and cooling water pump 116 spaced apart.

In the present invention, cooling water pump 116 and freeing pipe 51 to 53 place the downside of a left side and right step base plate 25,25 respectively, thereby, can be fully that freeing pipe 51 to 53 and cooling water pump 115 is spaced apart.

When cooling water pump 116 and cooling water pipe 112 are configured in the downside of same step base plate 25, the length setting of the cooling water pipe 112 that extends out from cooling water pump 116 can be got lessly, can accomplish to reduce the weight of vehicle by this.

Fig. 9 is the left side view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention.Cooling water pump 116 is arranged on the side of crankcase 43 of driving engine 14, and cooling water pipe 112 forwards extends from cooling water pump 116, and is connected in the radiator portion 44.

Get back to Fig. 1, because driving engine 14 comprises bevelled cylinder portion 45 forwards, so can dispose driving engine 14 lower.Owing to can therefore dispose driving engine 14 lower,, by this, can guarantee to be positioned at the leg of intermediate cap member 63 upsides by space 65 broads so can dispose the intermediate cap member 63 that constitutes the part of cover member 61 lower.

Although extend with freeing pipe 51 to 53 bunchys and on the right side of driving engine 14 in the present embodiment,, also can extend with freeing pipe 51 to 53 bunchys and in the left side of driving engine 14.

Figure 10 is the transparent view that is used for illustrating according to the configuration of components around the low floor type motorcycle driving engine of the present invention.The floor bracket 26 that is used for step base plate 25 (see figure 1)s are mounted thereon is extended on the right side of vehicle 12, freeing pipe 51 to 53 and set portion 54 are configured in the downside of floor bracket 26, be used for according to the blow off valve 67 that condition of service is regulated aperture area be arranged on set portion 54 near.

Figure 11 is the cutaway view along the line 11-11 of Figure 10, is the cutaway view of blow off valve 67.

Blow off valve 67 comprises: be used for changing the valve 1310 at the exhaust flow velocity of set portion 540; Valve rod 1320 as the exhaust valve spindle that valve 1310 is mounted thereon; The pulley 1330 that is used for rotary valve rod 1320; Form and be installed in the L shaped retainer 1340 on the valve rod 1320 discretely with pulley 1330; Retainer bearing piece 1350, retainer 1340 abut against on this retainer bearing piece 1350, thus the angle of the opening/closing of inhibitor valve 1310; Housing 1360 is used for pulley 1330, retainer 1340 and retainer bearing piece 1350 are loaded in it; Lid 1380 has the above-mentioned installation portion 1370 that is used for covering shell 1360; Torque spring 1390 is arranged between housing 1360 and the pulley 1330, is used for applying bias voltage along the opening direction of valve 1310; And captive nut 1420, it combines with outer screw section 1410 screw threads on the end that is formed on valve rod 1320.

Figure 11 represents: bolt 1440, and this bolt 1440 is used for valve 1310 is fixed to valve rod 1320, and makes packing ring 1450 therebetween; Bolt 1460, this bolt 1460 is used for housing 1360 is fixed to stay 1470, and makes retainer bearing piece 1350 therebetween; Bolt 1480, this bolt 1480 is used for housing 1360 is fixed to stay 1470, and makes retainer bearing piece 1350 therebetween, and is used for the end locking with torque spring 1390; And step bolt 1490, this step bolt 1490 is used for direct fixed cap 1380, and this lid 1380 covers housing 1360 on the stay.

Figure 12 is arranged on according to the planar view of the blow off valve in the low floor type motorcycle of the present invention 67 (part sectional view).Blow off valve 67 has such structure, wherein, the other end 1320b of valve rod 1320 is inserted in the through hole 1520,1520 in the seat portion 1510, utilize bolt 1530,1530 valve 1310 to be installed to the other end 1320b side of valve rod 1320, and make packing ring 1530a between them, the housing support 1550 of housing 1360 inserts from an end 1320a side of valve rod 1320, housing 1360 is fixed on stay 1470 (see figure 7)s of seat portion 1510, by this, valve rod 1320 can be supported portion 1560 and housing support 1550 is rotatably mounted.

Get back to Fig. 1, comprise emission control 70 as the blow off valve 67 of the said structure of operating portion, be installed on the vehicle body frame 11, servomotor 73 is operated according to the order that comes from control unit 74, and the aperture area of blow off valve 67 is regulated by operating line 71,72 by servomotor 73.

Get back to Fig. 8 and since blow off valve 67 be arranged on set portion 54 near, so, by regulating the position of set portion 54 on fore-and-aft direction, blow off valve 67 can be placed set portion 54 near, need not to strengthen the width of vehicle 12.

Incidentally, can omit blow off valve 67.

Figure 13 is used for illustrating the lateral plan that is arranged on according to the Poewr transmission mechanism of low floor type motorcycle of the present invention.Poewr transmission mechanism 42 is arranged on the rearward end of rear-swing arm 31 and places the outside of rear-swing arm 31, and axle drive shaft 41 extends out from output shaft 113 (see figure 4)s of driving engine 14, and the power of axle drive shaft 41 is delivered to trailing wheel 39.Driving box 170 is around the axle 39J configuration of trailing wheel 39, and described driving box 170 is equipped with driving device, and the change that is used for direction of passage passes to trailing wheel 39 with the propulsive effort of axle drive shaft 41.

Rear-swing arm 31 is curved frames of lateral process upwards.

Because rear-swing arm 31 is crooked, so can improve the presentation quality of rear-swing arm 31.

Pivot 28 places the upside of axle drive shaft 41, and upwards the rear-swing arm 31 of lateral process rearward extends from pivot 28, and the bottom of back buffer cell 32 is installed on the rear-swing arm 31 by connecting rod mechanism 76, and the upper end of back buffer cell 32 is fixed to vehicle body frame 11 sides.

That is, Power train 42 has driving box 170, described driving box 170 be arranged on rear-swing arm 31 rearward end and the driving device that the change that is used for direction of passage passes to the propulsive effort of axle drive shaft 41 trailing wheel 39 is housed.Axle drive shaft 41 places the downside of rear-swing arm 31 and is positioned at the downside of pivot 28.To be described in detail in the back for actuating device.

Figure 14 is the cutaway view along the 14-14 line intercepting of Figure 13, the cross section of expression rear-swing arm 31.

Do not set the cross sectional shape of rear-swing arm 31 for common rectangle, and set the state that two rectangular boxs of imaging are stacked, by this, can improve modulus of section.Therefore owing to can improve modulus of section, so, the flexural rigidity of rear-swing arm 31 can be improved.

Cross sectional shape must not be this state (two state that rectangular box piles up); For example, also can adopt other shape, for example three shapes that rectangular box piles up.

Figure 15 is used for illustrating the transparent view that is arranged on according to the Poewr transmission mechanism of low floor type motorcycle of the present invention.Be provided with trailing wheel 39 the axle 39J and around the axle 39J driving box 170, the rearward end 31b of rear-swing arm 31 is connected on the driving box 170, back brake unit 157 is in axial direction fixing, (Antilock Braking System: wheel speed sensors 158 anti-skid brake system) for example is installed on the part of back brake unit 157 to be used for ABS.Figure 15 also expresses brake pipe 159.

Figure 16 (a) is used for illustrating the cutaway view that is arranged on according to the Poewr transmission mechanism of low floor type motorcycle of the present invention.

Figure 16 (a) represents embodiment.Power train 42 comprises axle drive shaft 41 and driving box 170, and described driving box 170 is equipped with the driving device 1540 that is used for by change of direction the propulsive effort of axle drive shaft 41 being passed to trailing wheel 39.Here, driving device 1540 comprises a pair of terminal teeth wheels 161 of the direction that is used to change propulsive effort, and damping device 162 comprises damper member 166, this damper member 166 and will change the shock attenuation that causes owing to torque between the axle 39J of terminal teeth wheels 161 and trailing wheel 39.

Below its detailed structure will be described.Terminal teeth wheels 161 comprise the first terminal gear 163 and the second terminal gear 164.The first terminal gear 163 is installed in the rearward end 41b of axle drive shaft 41, the second terminal gear 164 and 163 engagements of the first terminal gear, and the second terminal gear 164 rotatably disposes coaxially with the center of the axle 39J of trailing wheel 39.

Damping device 162 comprises damper member 166 and damper retainer 167.Damper member 166 is configured on the rear surface 164b of the second terminal gear 164, the plate-like damper retainer 167 of axle on the 39J that is fixed to trailing wheel 39 is configured on the damper member 166, damper member 166 is clamped between the surperficial 167a of the rear surface 164b of the second terminal gear 164 and damper retainer 167, by this, the propulsive effort of axle drive shaft 41 is passed to the axle 39J of trailing wheel 39, make simultaneously because the shock attenuation that the variation of the torque of axle drive shaft 41 causes.

The driving box 170 that covers Power train 42 is used to cover damping device 162 and driving device 1540, and comprises the damper case 174 and the case of differential 173.Pack into the drive chamber 171 of damping device 162 and driving device 1540 of the portion within it of being used for is formed on the inside of case 173,174.Drive chamber's 171 usefulness oil is filled.

Figure 16 (a) expression: axle box 172, this axle box 172 is arranged on the member of the case of differential 173 front sides, covers axle drive shaft 41; Bearing 176a to 176d; The wheel 178 of back plate-like brake disc 177 and trailing wheel 39.

Specifically, driving box 170 is equipped with the driving device 1540 that is used for transmitting by change of direction the propulsive effort of axle drive shaft 41, be arranged on the rearward end 31b of rear-swing arm 31, the damping device 162 that is used for the vibrations of attenuation to the trailing wheel 39 is arranged on the inside of driving box 170, and damping device 162 is provided with the coaxial damper member 166 of axle 39J with trailing wheel 39.

Figure 16 (b) represents comparative example, will describe the complete difference of embodiment with Figure 16 (a) below.

Be used to cover the driving box 170B of driving device 1540B, comprise: be arranged on the damper case 174B of approximate centre portion of the axle 39Jb of trailing wheel 39B, so that cover damping device 162B; Lid member 181, this lid member 181 is arranged on the axle drive shaft 41B side of damper case 174B along the axial direction of trailing wheel 39B, so that cover damper case 174B; And the case of differential 173B that is used for covering driving device 1540 from the outside of lid member 181.

Driving box 170B comprises damper case 174B and lid member 181 and case of differential 173B, the damper chamber 182 that damper device 162B is housed is formed on the inside of damper case 174B, and the diff chamber 183 that driving device 1504B is housed is formed on the inside of case of differential 173B.Each of damper chamber 182 and diff chamber 183 all uses oil to fill.

Therefore, damper chamber 182 is arranged on the wheel 178B side of trailing wheel 39B, and damper chamber 182 is independent of diff chamber 183 and is provided with.

The length that will between Figure 16 (a) and Figure 16 (b), compare the axle 39J of trailing wheel 39 below.

In Figure 16 (a), the drive chamber 171 that driving device 1540 and damper device 162 are housed is arranged on the inside of driving box 170, thereby, to compare with the axle among Figure 16 (b), the length of axle 39J reduces length W.

Because driving device 1540 and damper device 162 are contained in the driving box 170, so, driving device 1540 and damper device 162 concentrated areas can be configured in one indoor.For example, need not to be provided for driving device 1540 and damper device 162 spaced spaced walls.

Under damper device 162 is provided with situation with the coaxial damper member 166 of axle 39J of trailing wheel 39,, then can dwindle the length of the axle 39J of trailing wheel 39 if do not need to be used for driving device 1540 and damper device 162 spaced spaced walls.When can dwindle trailing wheel 39 the axle 39J length the time, the width setup of vehicle 12 can be got less.

In addition, the situation that is provided with damper member 166 with the axle box 172 that is used to cover axle drive shaft 41 is compared, and can dwindle the size of axle box 172.

The function of low floor type motorcycle will be described below.

Get back to Fig. 8, because a plurality of freeing pipe 51 to 53 is by bunchy, so, freeing pipe 51 to 53 can be focused on the left side of vehicle body frame 11 and the side in the right side, need not they are disperseed each other.Owing to freeing pipe 51 to 53 can be focused on the left side of vehicle body frame 11 and the side in the right side, can save the space around the driving engine 14.

In addition, because freeing pipe 51 to 53 is configured in the downside of step base plate 25, so, can improve the presentation quality of low floor type motorcycle.

Because freeing pipe 51 to 53 is by bunchy together and place the downside of step base plate 25, so, freeing pipe 51 to 53 can be focused on the left side of vehicle body frame 11 and the side in the right side, need not to disperse each other.Owing to freeing pipe 51 to 53 can be configured to focus on the left side of vehicle body frame 11 and the side in the right side, so, freeing pipe does not pass through at the rear side of driving engine 14, thereby, can effectively utilize the space (being used to dispose the space 115 of freeing pipe) of the freeing pipe of driving engine 14 rear sides.Owing to therefore can effectively utilize the freeing pipe space of driving engine 14 rear sides, so the degree of freedom in the time of can improving design vehicle for example, can improve the degree of freedom of configuration rear-swing arm 31 (label 31 among Fig. 1).

Set portion 54 is configured in the downside of step base plate 25.

In low floor type motorcycle 10, each is set all by the side of driving engine 14 be used to guarantee that the cross section that the surface of angle of roll forms is leg-of-mutton space at the downside of step base plate 25,25, thereby, set portion 54 freely can be arranged on any the downside in the step base plate 25,25.Owing to improved the degree of freedom of arranging set portion 54, so, for example, can freely set freeing pipe 51 to 53 length from cylinder to set portion 54.Therefore in the time can freely setting freeing pipe to the length of set portion 54, can easily carry out the adjusting of the tractive performance between the cylinder, can improve Design freedom.

Above invention has been described, clearly, the present invention can change in every way.Should not think that such change has broken away from the spirit and scope of the present invention, for those skilled in the art, clearly, all these remodeling all will be included in the scope of claim described below.

Claims (19)

1. one kind has the motor bike that hangs down base plate, comprising:

The step base plate, described step base plate is positioned at the left side and the right side of vehicle body frame, and driver's pin is positioned on this step base plate;

The cover member, this cover member is arranged between the described step base plate, so that cover described vehicle body frame;

Driving engine, described driving engine is arranged on the downside of described cover member; And

A plurality of freeing pipes, described freeing pipe extends out from the cylinder of described driving engine respectively, and described freeing pipe is gathered in set portion,

Wherein, described driving engine is to have an inline type three-cylinder engine of bevelled cylinder portion forwards,

Described driving engine is a watercooled engine,

For the cooling water pipe of described driving engine setting is configured in the downside of described step base plate, and be positioned at and dispose the opposite other side of a side of described freeing pipe, and

With described freeing pipe a side of described driving engine be configured in a step base plate in left side and the right side below, with described cooling water pipe the opposite side of described driving engine be configured in another step base plate below.

2. the motor bike that has low base plate as claimed in claim 1 is characterized in that described driving engine is provided with balance shaft, is used to reduce elementary coupling vibration.

3. the motor bike that has low base plate as claimed in claim 1 is characterized in that described vehicle body frame comprises:

Upper component, described upper component pipe in the past extend to the upside of described driving engine; And

Lower member, described lower member is extended to the cross side of the cylinder portion of described driving engine from described preceding pipe, and described driving engine is supported by the bottom of described lower member.

4. the motor bike that has low base plate as claimed in claim 2 is characterized in that described vehicle body frame comprises:

Upper component, described upper component pipe in the past extend to the upside of described driving engine; And

Lower member, described lower member is extended to the cross side of the cylinder portion of described driving engine from described preceding pipe, and described driving engine is supported by the bottom of described lower member.

5. the motor bike that has low base plate as claimed in claim 1 is characterized in that described driving engine is fixed directly on the described vehicle body frame, and between them without any elastic component.

6. the motor bike that has low base plate as claimed in claim 1 is characterized in that,

Described driving engine comprises cooling water pipe, and for the vehicle centre-line in the plan view, described cooling water pipe is configured in the opposition side on the left and right directions of described freeing pipe.

7. the motor bike that has low base plate as claimed in claim 2, it is characterized in that described driving engine comprises cooling water pipe, and, for the vehicle centre-line in the plan view, described cooling water pipe is configured in the opposition side on the left and right directions of described freeing pipe.

8. the motor bike that has low base plate as claimed in claim 1 is characterized in that,

With the state of described a plurality of freeing pipes formation bunchys,

Side at the crankcase of driving engine is equipped with cooling water pump, the freeing pipe of bunchy is configured in the below of the step base plate of either side in the left and right sides, simultaneously, be disposed at the side of a side different with the cooling water pump of the side of the crankcase that is configured in driving engine, thereby, make cooling water pump be configured in from plan view read fortune for vehicle centre-line on left and right directions a side opposite with freeing pipe.

9. the motor bike that has low base plate as claimed in claim 8 is characterized in that, described set portion is configured in the downside of described step base plate.

10. the motor bike that has low base plate as claimed in claim 8 is characterized in that,

Described driving engine is a watercooled engine, and

For the cooling water pipe of described driving engine setting is configured in the downside of described step base plate, and be positioned at and dispose the opposite other side of a side of described freeing pipe.

11. the motor bike that has low base plate as claimed in claim 9 is characterized in that,

Described driving engine is a watercooled engine, and

For the cooling water pipe of described driving engine setting is configured in the downside of described step base plate, and be positioned at and dispose the opposite other side of a side of described freeing pipe.

12. the motor bike that has low base plate as claimed in claim 8, it is characterized in that described driving engine is equipped with cooling water pipe, and, for the vehicle centre-line in the plan view, described cooling water pipe is configured in the opposition side on the left and right directions of described freeing pipe.

13. the motor bike that has low base plate as claimed in claim 9, it is characterized in that described driving engine is equipped with cooling water pipe, and, for the vehicle centre-line in the plan view, described cooling water pipe is configured in the opposition side on the left and right directions of described freeing pipe.

14. the motor bike that has low base plate as claimed in claim 10, it is characterized in that described driving engine is equipped with cooling water pipe, and, for the vehicle centre-line in the plan view, described cooling water pipe is configured in the opposition side on the left and right directions of described freeing pipe.

15. the motor bike that has low base plate as claimed in claim 8 is characterized in that, is provided with the blow off valve that is suitable for regulating according to condition of service aperture area near described set portion.

16. the motor bike that has low base plate as claimed in claim 8 is characterized in that described driving engine is fixed directly on the described vehicle body frame, and between them without any elastic component.

17. the motor bike that has low base plate as claimed in claim 1 is characterized in that,

Each of described freeing pipe is a corresponding extension downwards from cylinder, and described freeing pipe is by bunchy and extend to the left side of described driving engine and the side in the right side,

Side at the crankcase of driving engine is equipped with cooling water pump, the freeing pipe of bunchy is disposed at the side of a side different with the cooling water pump of the side of the crankcase that is configured in driving engine, thereby, make cooling water pump be configured in from plan view read fortune for vehicle centre-line on left and right directions a side opposite with freeing pipe.

18. the motor bike that has low base plate as claimed in claim 17 is characterized in that, setting is suitable for regulating according to condition of service the blow off valve of aperture area near described set portion.

19. the motor bike that has low base plate as claimed in claim 17 is characterized in that described driving engine is fixed directly on the described vehicle body frame, and between them without any elastic component.

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