WO2014038304A1

WO2014038304A1 - Scooter-type vehicle

Info

Publication number: WO2014038304A1
Application number: PCT/JP2013/070193
Authority: WO
Inventors: 卓也江口; 章仁福井; 淳志大橋; 剛村松
Original assignee: スズキ株式会社
Priority date: 2012-09-06
Filing date: 2013-07-25
Publication date: 2014-03-13
Also published as: JP2014051170A; IN2015DN00917A; CN104602999B; JP6056285B2; CN104602999A

Abstract

The present invention has: a power unit (5) supported by a vehicle frame (11) in a manner so as to be able to oscillate; an air intake system (54) that includes a throttle body (543) that adjusts the amount of air for combustion; an air intake pipe (544) connecting the throttle body (543) and an air intake port (601) in a manner so that air for combustion can flow through; and an article housing section (17) provided to the top of the power unit (5). The power unit (5) is supported by the vehicle frame (11) at the bottom thereof in a manner so as to be able to oscillate; the air intake pipe (544) interconnects with the air intake port (601) from the diagonal top with respect to the direction of vehicle width; and a fuel injection device (602) is between a cylinder assembly (51) and the article housing section (17) and is provided to the upper surface of a cylinder head (512) of the cylinder assembly (51).

Description

Scooter type vehicle

The present invention relates to a scooter type vehicle. More specifically, the present invention relates to the structure of an intake system of an internal combustion engine in a scooter type vehicle having an internal combustion engine and an article accommodating portion disposed above the internal combustion engine.

2. Description of the Related Art Conventionally, some scooter type vehicles have a swing-type power unit that is swingably supported by a vehicle body frame, and an article accommodating portion that is provided on the upper side of the power unit.
A configuration as described in Patent Document 1 is known as a support structure for an intake system and a power unit of a conventional scooter type vehicle. In the scooter type vehicle described in Patent Document 1, the power unit is swingably supported on the vehicle body frame by a pair of left and right vibration isolation links provided on the upper side. And an inlet pipe is provided so that it may pass between a pair of left and right anti-vibration links. Further, the fuel injection device (injector) is between a throttle valve provided upstream of the inlet pipe and an intake valve of the engine (power unit), and includes a pair of left and right vibration-proof links, a bottom portion of the article accommodating portion, and an upper surface of the engine. Are provided in a region formed by.

However, such a configuration has the following problems. In such a configuration, each member or device of the intake system is provided between the power unit main body and the article accommodating portion. For this reason, in order to prevent interference between the intake system and the article accommodating portion, it is necessary to form a concave portion recessed upward on the lower surface of the article accommodating portion, or to raise the position of the article accommodating portion.
And if a recessed part is formed in the lower surface of an article accommodating part, the volume of an article accommodating part will decrease. On the other hand, when the position of the article storage unit increases, the position of the sheet provided on the upper side of the article storage unit needs to be increased. If it does so, there is a possibility that the footing property may deteriorate and the riding property and the stopping stability may deteriorate.
In addition, if the left and right pair of anti-vibration links are provided above the power unit, the intake system may interfere with the left and right pair of anti-vibration links. For this reason, the degree of freedom in the design of the intake system (the degree of freedom in the arrangement position and orientation of each member and device of the intake system) may be reduced.

Japanese Patent No. 3765966

In view of the above situation, the problem to be solved by the present invention is to improve the degree of freedom in designing the intake system in the scooter type vehicle having the article accommodating portion and the swing type power unit, and to reduce the volume of the article accommodating portion. It is to prevent the decrease.

In order to solve the above problems, the present invention provides a vehicle body frame, a cylinder assembly in which a combustion chamber is formed, and an intake port that is formed integrally with the cylinder assembly and serves as a path for supplying combustion air to the combustion chamber. And a fuel injection device that injects fuel into the intake port, a power unit that is swingably supported by the vehicle body frame, and a throttle body that adjusts the amount of combustion air supplied to the intake port Including an intake system, an intake pipe connecting the throttle body and the intake port so that combustion air can flow therethrough, and an article accommodating portion provided on the upper side of the power unit. The intake pipe is supported by the vehicle body frame so as to be swingable, and the intake pipe communicates with the intake port obliquely from above in the vehicle width direction. And, the fuel injection device is arranged between the said cylinder assembly and the article storage portion, and which are located on the upper surface of the cylinder assembly the cylinder head.

The intake pipe is provided at a position deviated from the center to one side with respect to the vehicle width direction, and the fuel injection device is located on the center side or the opposite side of the vehicle width center with respect to the vehicle width direction. And it overlaps with the said intake pipe in side view, It is characterized by the above-mentioned.

The vehicle body frame includes a pair of left and right body tubes provided away from each other in the vehicle width direction, and a bracket provided across the pair of left and right body tubes, and the article accommodating portion is attached to the bracket, In a side view, the fuel injection device is provided at a position lower than a straight line connecting the upper surface of the bracket and the uppermost end of the throttle body.

According to the present invention, the power unit is swingably supported on the vehicle body frame on the lower side. An intake system is provided above the power unit. For this reason, since the intake system does not interfere with the structure for supporting the engine unit, the degree of freedom in designing the intake system can be improved. Further, since the degree of freedom in the design of the intake system is increased, the intake system members and devices can be reduced, so that the interference between the intake system and the article storage portion can be prevented or suppressed. Therefore, it is possible to prevent or suppress a decrease in the volume of the article storage unit.

FIG. 1 is a left side view schematically showing a configuration of a motorcycle according to an embodiment of the present invention. FIG. 2 is a right side view schematically showing the configuration of the motorcycle according to the embodiment of the present invention. FIG. 3 is a left side view schematically showing the configuration of the body frame of the motorcycle according to the embodiment of the present invention. FIG. 4 is a plan view schematically showing the configuration of the body frame of the motorcycle according to the embodiment of the present invention. FIG. 5 is an external perspective view schematically showing the configuration of the power unit and the article accommodating portion. FIG. 6 is a left side view schematically showing the configuration of the power unit. FIG. 7 is a plan view schematically showing the configuration of the power unit. FIG. 8 is an external perspective view schematically showing the configuration of the upper part of the cylinder assembly of the power unit. FIG. 9 is an external perspective view schematically showing the configuration of a part of the cylinder assembly and the intake system of the power unit. FIG. 10 is a partial cross-sectional view schematically showing a configuration of a part of the cylinder assembly and the intake system of the power unit. FIG. 11 is a cross-sectional view schematically showing a configuration of a part of the cylinder assembly and the intake system of the power unit, and is a view taken along arrow XI in FIG. 12 is a cross-sectional view schematically showing a configuration of a part of the cylinder assembly and the intake system of the power unit, and is a view taken along the line XII-XII in FIG. FIG. 13 is a front view schematically showing an assembled configuration of the power unit and the article accommodating portion. FIG. 14 is a left side view schematically showing an assembled configuration of the power unit and the article accommodating portion. FIG. 15 is a side view (partially including a cross section) schematically showing the positional relationship between the cylinder assembly and the bottom of the article accommodating portion.

Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the following embodiments, a scooter type motorcycle 1 is shown as a scooter type vehicle. Hereinafter, for convenience of explanation, the “scooter type motorcycle” may be simply referred to as “motorcycle”. The orientation of the motorcycle 1 and the members of the motorcycle 1 is based on the orientation of the driver who rides on the motorcycle 1. In each figure, the front side of the motorcycle 1 is indicated by an arrow Fr, the rear side is indicated by an arrow Rr, the upper side is indicated by an arrow Tp, the lower side is indicated by an arrow Bt, the right side is indicated by an arrow R, and the left side is indicated by an arrow L.

First, the overall configuration of the motorcycle 1 will be described with reference to FIGS. FIG. 1 is a left side view schematically showing a configuration of a motorcycle 1 according to an embodiment of the present invention. FIG. 2 is a right side view schematically showing the configuration of the motorcycle 1 according to the embodiment of the present invention. FIG. 3 is a left side view schematically showing the configuration of the body frame 11 of the motorcycle 1 according to the embodiment of the present invention. FIG. 4 is a plan view schematically showing the configuration of the body frame 11 of the motorcycle 1 according to the embodiment of the present invention.

As shown in FIGS. 1 to 4, the motorcycle 1 includes a vehicle body frame 11, a steering device 13, a power unit 5, a rear wheel 150, an article accommodating portion 17, and various vehicle body covers.

The vehicle body frame 11 includes a steering head pipe 111, a main tube 112, a pair of left and right body tubes 113, a pair of left and right side tubes 114, and a frame bridge 115. Each of these parts is formed of an iron-based metal or an aluminum alloy. These parts are joined together by welding or the like.
The steering head pipe 111 has a tubular configuration that tilts backward as a whole, and is provided on the front upper side of the vehicle body frame 11. A steering shaft 131 of the steering device 13 is inserted into the steering head pipe 111. And the steering head pipe 111 supports the steering shaft 131 rotatably.
The main tube 112 is joined to the rear side of the steering head pipe 111. The main tube 112 extends substantially horizontally from the rear side of the steering head pipe 111 toward the rear and obliquely downward (hereinafter referred to as a forward tilt portion) and from the lower end of the forward tilt portion to the rear. Part (hereinafter referred to as a horizontal part).
The frame bridge 115 is a columnar portion extending in the left-right direction. An intermediate portion in the longitudinal direction (left-right direction) of the frame bridge 115 is joined to the rear end portion of the main tube 112.
The pair of left and right body tubes 113 extend rearward and obliquely upward from each of the vicinity of the left and right ends of the frame bridge 115. In the pair of left and right body tubes 113, the front end portion and the intermediate portion in the front-rear direction are separated from each other in the left-right direction at a predetermined distance, and are joined at the rear end portion. For this reason, an area surrounded by the pair of left and right body tubes 113 is formed in the rear portion of the vehicle body frame 11 when viewed from above (see particularly FIG. 4).
A frame bracket 116 is provided near the front end of the pair of left and right body tubes 113. The frame bracket 116 supports the article accommodating portion 17 from below. The frame bracket 116 is a plate-like member, and each end portion in the longitudinal direction (left-right direction) is joined to each of the pair of left and right body tubes 113. The frame bracket 116 is provided so as to straddle the pair of left and right body tubes 113. The frame bracket 116 may be directly joined to the pair of left and right body tubes 113, or may be joined to the pair of left and right body tubes 113 via other members (indirectly). May be. Further, an intermediate portion in the longitudinal direction (left-right direction) of the frame bracket 116 is provided at a position higher than both end portions. For example, the frame bracket 116 is formed in an inverted “U” shape when viewed in the front-rear direction.
The front end portions of the pair of left and right side tubes 114 are joined to the vicinity of the lower end portion of the forward inclined portion of the main tube 112, and the rear end portions of the pair of left and right side tubes 114 are joined to the vicinity of the front end portions of the pair of left and right body tubes 113. . Each of the pair of left and right side tubes 114 extends obliquely rearward and leftward and rightward from the forward inclined portion of the main tube 112. The pair of left and right side tubes 114 are separated from each other by a predetermined distance in the left-right direction.
The frame bridge 115 is provided with a pair of left and right engine brackets 117 for supporting the power unit 5. Each of the pair of left and right engine brackets 117 protrudes substantially rearward from each of the end portions in the longitudinal direction (left and right direction) of the frame bridge 115. Each of the pair of left and right engine brackets 117 has a rib-like configuration.
An anti-vibration link 118 (also referred to as an engine stay) is attached to the rear end portion of the engine bracket 117 so as to be swingable in the vertical direction (pitching direction). The anti-vibration link 118 has a swing shaft extending in the left-right direction and an arm portion that protrudes obliquely downward in the rearward direction from the swing shaft. The swing shaft is swingably supported by a pair of left and right engine brackets 117. The power unit 5 is coupled to the front end portion (rear end portion) of the arm portion so as to be swingable in the vertical direction (pitching direction). An elastic member is installed between the swing shaft and the frame bridge 115. For this reason, the vibration isolation link 118 swings in the vertical direction due to the elastic deformation of the elastic member when a force of a predetermined magnitude or more is applied.

The steering device 13 includes a steering shaft 131, a handle unit 134, a pair of left and right front forks 132, and a front wheel 133.
The steering shaft 131 is rotatably supported by the steering head pipe 111 of the vehicle body frame 11.
The pair of left and right front forks 132 rotatably support the front wheel 133. The upper end portions of the pair of left and right front forks 132 are coupled to the lower end portion of the steering shaft 131 via, for example, an under bracket (also referred to as an under bridge).
The handle unit 134 includes a handle unit cover 135 and a handle grip 137 that protrudes outward from the handle unit cover 135 in the left-right direction. The right handle grip 137 is rotatably provided with a throttle grip for operating a throttle body 543 (described later). The driver operates the throttle body 543 by adjusting the throttle grip (adjusts the opening of the throttle valve). A headlight 138 and a blinker 139 are assembled to the front portion of the handle unit cover 135. A meter unit 136 is assembled on the top of the handle unit cover 135. The meter unit 136 is provided with various instruments such as a speedometer. In addition, the handle unit 134 is provided with a brake lever, a rearview mirror, various switches for operating the motorcycle 1, and the like.

The power unit 5 as a power source has a cylinder assembly 51, a crankcase assembly 52, a transmission unit 53, an intake system 54, an exhaust system 55, other predetermined devices, etc., and these are unitized. Is. The intake system 54 includes an air cleaner 541, a connecting pipe 542, a throttle body 543, and an intake pipe 544 (also referred to as an intake pipe). The exhaust system 55 includes an exhaust pipe 552 and a silencer 551.
A rear wheel 150 is provided at the rear of the power unit 5, and the rotational power generated by the power unit 5 is transmitted to the rear wheel 150. The power unit 5 is coupled to the anti-vibration link 118 so as to be swingable in the vertical direction (pitching direction). A shock absorber is provided between the power unit 5 and one or both of the pair of left and right body tubes 113. The shock absorber alleviates vibration and impact transmitted from the rear wheel 150. Thus, the power unit 5 also has a function of a swing arm that rotatably supports the rear wheel 150.
A swing type power unit 5 is applied to the motorcycle 1. Details of the configuration of the power unit 5 will be described later.

On the upper side of the power unit 5, there is provided an article accommodating portion 17 that can accommodate a helmet and other articles. The article accommodating portion 17 is a container opened on the upper side, and is formed by synthetic resin injection molding or the like. A part of the article accommodating portion 17 enters an area surrounded by the pair of left and right body tubes 113 of the body frame 11. The article storage unit 17 is attached to the pair of left and right body tubes 113 and the frame bracket 116 with screws or the like. In particular, the vicinity of the front end portion of the bottom of the article accommodating portion 17 is located above the frame bracket 116. The vicinity of the front end portion of the article accommodating portion 17 is supported from below by the frame bracket 116. An elastic member 301 is provided between the frame bracket 116 and the bottom surface of the article storage unit 17. As the elastic member 301, a member having a function of softening vibration and impact, such as vibration-proof rubber, is applied. With such a configuration, vibration and impact transmitted from the vehicle body frame 11 to the article accommodating portion 17 are reduced.
A seat 155 on which a driver (or a driver and a passenger) sits is provided above the article storage unit 17. The sheet 155 also serves as a lid of the article storage unit 17. For this reason, the front end portion of the sheet 155 is coupled to the upper portion of the front end portion of the article accommodating portion 17 so as to be rotatable in the vertical direction via a hinge mechanism or the like. A driver or the like can open and close the seat 155 as a lid of the article accommodating portion 17 by rotating the rear portion of the seat 155 so as to be lifted.

A step board 151 is provided on the horizontal portion of the main tube 112 and above the pair of left and right side tubes 114. A driver sitting on the seat 155 can put his / her feet on the step board 151. The step board 151 is attached to the pair of left and right side tubes 114 with screws or the like.
A leg shield 152 that protects the driver's feet is provided on the front side of the seat 155 and the step board 151 and below the handle unit 134. The leg shield 152 is attached to the forward inclined portion of the main tube 112 with a screw or the like.
A side cover 153 is provided from the lower side to the rear side of the seat 155. The side cover 153 is attached to the pair of left and right body tubes 113 with screws or the like. The article storage unit 17 and the pair of left and right body tubes 113 are covered with the side cover 153. In addition, lights such as a taillight, a brake lamp, and a blinker are provided at the rear portion of the side cover 153.
The step board 151, the leg shield 152, and the side cover 153 are formed by synthetic resin injection molding or the like.
In addition, the motorcycle 1 includes a front fender 156 and a rear fender 157. The front fender 156 is attached to the pair of left and right front forks 132 and covers the upper side of the front wheel 133. The rear fender 157 is attached to the side cover 153 and covers the upper side of the rear wheel 150.

Next, details of the configuration of the power unit 5 will be described with reference to FIGS. FIG. 5 is an external perspective view schematically showing the configuration of the power unit 5 and the article storage unit 17. FIG. 6 is a left side view schematically showing the configuration of the power unit 5. FIG. 7 is a plan view schematically showing the configuration of the power unit 5. FIG. 8 is an external perspective view schematically showing the configuration of the upper part of the cylinder assembly 51 of the power unit 5. FIG. 9 is an external perspective view schematically showing a part of the configuration of the cylinder assembly 51 and the intake system 54 of the power unit 5. FIG. 10 is a partial cross-sectional view schematically showing the configuration of a part of the cylinder assembly 51 and the intake system 54 of the power unit 5. FIG. 11 is a cross-sectional view schematically showing the configuration of a part of the cylinder assembly 51 and the intake system 54 of the power unit 5, and is a view taken along the line XI in FIG. 12 is a cross-sectional view schematically showing the configuration of a part of the cylinder assembly 51 and the intake system 54 of the power unit 5, and is a view taken along the line XII-XII in FIG. In these drawings, the exhaust system 55 is omitted.

The power unit 5 includes a cylinder assembly 51, a crankcase assembly 52, a transmission unit 53, an intake system 54, and an exhaust system 55 (see FIG. 2 for the exhaust system 55). Further, the intake system 54 includes an air cleaner 541, a connection pipe 542, a throttle body 543, and an intake pipe 544.

The cylinder assembly 51 is located at the front part of the power unit 5. The crankcase assembly 52 is located on the rear side of the cylinder assembly 51. The transmission unit 53 is located from the right side of the crankcase assembly 52 to the right rear. The power unit 5 is provided below the article storage unit 17. In particular, the cylinder assembly 51 of the power unit 5 is located below the bottom of the article storage unit 17. A predetermined gap is formed between the upper surface of the cylinder assembly 51 and the lower surface of the bottom of the article accommodating portion 17. This gap will be described later.

The cylinder assembly 51 includes a cylinder block 511, a cylinder head 512, and a cylinder head cover 513.
A combustion chamber 606 is formed inside the cylinder block 511 (see FIGS. 10 and 11). Inside the combustion chamber 606, a piston is disposed so as to be able to reciprocate (not shown). In addition, an intake port 601 (also referred to as an intake port) and an exhaust port 604 (also referred to as an exhaust port) are formed in the cylinder block 511 (see FIGS. 9 to 12). The intake port 601 serves as a path for supplying combustion air from the intake system 54 to the combustion chamber 606. Details of the configuration of the intake port 601 will be described later. The exhaust port 604 provides a path for sending exhaust gas from the combustion chamber 606 to the exhaust system 55. The center line C (piston reciprocation locus) of the combustion chamber 606 extends in the front-rear direction when viewed from the top, and inclines upward at an angle closer to the horizontal than the substantially horizontal or vertical when viewed from the side (FIG. 6). FIG. 7, FIG. 11, FIG. 12).
The cylinder head 512 is attached to the front side of the cylinder block 511. The cylinder head 512 includes an intake valve 603 that opens and closes between the intake port 601 and the combustion chamber 606, an exhaust valve (not shown) that opens and closes between the exhaust port 604 and the combustion chamber 606, an intake valve 603, and an exhaust valve. And a valve driving mechanism for driving the valve.
Further, the cylinder head 512 is provided with a fuel injection device 602 (also referred to as an injector) that injects fuel into the intake port 601. The fuel injection device 602 is provided on the upper surface of the cylinder head 512 so as to protrude upward. Further, with respect to the left-right direction (vehicle width direction), it is provided on the center side of the intake pipe 544 or on the opposite side of the vehicle width center. For example, the fuel injection device 602 may be located closer to the intake pipe 544 than the center line C of the combustion chamber 606 in the left-right direction (vehicle width direction), or located on or near the center line C. Alternatively, it may be located on the opposite side of the intake pipe 544 from the center line C. In each drawing, a configuration in which the fuel injection device 602 is provided on the center line C of the combustion chamber 6006 is shown. The manner in which the fuel injection device 602 is attached and the relationship between the fuel injection device 602 and the intake port 601 will be described later.
The cylinder head cover 513 is attached to the front side of the cylinder head 512. The cylinder head cover 513 covers a valve driving mechanism and the like provided on the cylinder head 512.

A crankshaft is rotatably disposed in the crankcase assembly 52. A pair of left and right connecting portions 56 for connecting the power unit 5 to the vehicle body frame 11 is provided at the lower portion of the crankcase assembly 52 (see FIGS. 5 and 6). Each of the pair of left and right connecting portions 56 has an arm-like configuration that protrudes obliquely downward from the lower side of the crankcase assembly 52. And the front-end | tip part of a left-right paired connection part 56 is located in the lower side of the cylinder assembly 51 in a side view (refer FIG. 6).

The transmission unit 53 includes a transmission (CVT unit) and a reduction gear, and these are accommodated in a swing case that is a casing. The transmission unit 53 is provided to extend rearward from the left side of the crankcase assembly 52. A rear wheel 150 is attached to the rear portion of the transmission unit 53. Thus, the speed change unit 53 is provided on the left side of the cylinder assembly 51 and the rear wheel 150 in the vehicle width direction and at a position biased to the left of the center line C of the combustion chamber 606 of the cylinder assembly 51. That is, the front portion of the transmission unit 53 is located on the left side of the crankcase assembly 52, and the rear portion is located on the left side of the rear wheel 150. Then, the transmission unit 53 transmits the rotation of the crankshaft to the rear wheel 150. As the transmission unit 53, for example, a belt-type continuously variable transmission unit is applied. A known configuration can be applied to the transmission unit 53. Therefore, detailed description of the transmission unit 53 is omitted.

The intake system 54 includes an air cleaner 541, a connection pipe 542, a throttle body 543, and an intake pipe 544.
The air cleaner 541 takes in and cleans combustion air from the outside. The air cleaner 541 is provided at the upper rear portion of the transmission unit 53 (see FIGS. 6 and 7). Note that the air cleaner 541 may be configured to be able to send purified combustion air toward the front side, and other configurations are not particularly limited.
The throttle body 543 adjusts the amount of combustion air supplied to the intake port 601 of the cylinder assembly 51. The throttle body 543 is provided on the front side of the air cleaner 541 and above the crankcase assembly 52 and the transmission unit 53. Therefore, the throttle body 543 is located on the upper left side of the cylinder assembly 51 in the front view or the rear view. Throttle body 543 and air cleaner 541 are connected by a connecting pipe 542. Further, the throttle body 543 and the intake port 601 are connected by an intake pipe 544. The combustion air purified by the air cleaner 541 is supplied to the intake port 601 of the cylinder assembly 51 through the connection pipe 542, the throttle body 543, and the intake pipe 544. The throttle body 543 has a throttle valve (also referred to as a throttle valve). The throttle valve is a valve whose opening degree fluctuates in conjunction with rotation of the throttle grip. The driver adjusts the opening of the throttle valve by rotating the throttle grip. As a result, the amount of combustion air supplied to the intake port 601 is adjusted.

Here, the flow path of the combustion air in the intake system 54 will be described.
The air cleaner 541, the connecting pipe 542, the throttle body 543, and the intake pipe 544 are provided on the outer side in the left-right direction (vehicle width direction) with respect to the center line C of the combustion chamber 606 of the cylinder assembly 51 in a top view (see FIG. 7). For example, the cylinder assembly 51 is provided such that the center line C of the combustion chamber 606 substantially coincides with the vehicle width center of the motorcycle 1 when viewed from above. When viewed from above, the air cleaner 541, the connecting pipe 542, the throttle body 543, and the intake pipe 544 are provided at a position deviated to the left from the center in the vehicle width direction (that is, the left outer side in the vehicle width direction). Therefore, as shown in FIG. 7, the center line A of the flow path of the combustion air from the air cleaner 541 to the intake pipe 544 is in the left-right direction from the center line C of the combustion chamber 606 of the cylinder assembly 51 in a top view ( It is located outside (vehicle width direction).
Combustion air flows from the rear side to the front side from the air cleaner 541 to the intake pipe 544. The center line A of the flow path of the combustion air gradually increases in the combustion chamber of the cylinder assembly 51 in the top view as it goes from the upstream side in the flow direction (rear side with respect to the motorcycle 1) to the downstream side (front side). Approach 606 centerline C.
The intake pipe 544 has a rear end (upstream end) connected to the throttle body 543 and a front end (downstream end) connected to the intake port 601. The vicinity of the rear end portion of the intake pipe 544 gradually approaches the center line C of the combustion chamber 606 of the cylinder assembly 51 as it approaches the front side as viewed from above. On the other hand, the vicinity of the front end of the intake pipe 544 approaches the intake port 601 from the upper left side. That is, the vicinity of the front end portion of the intake port 601 extends substantially in the left-right direction (vehicle width direction) when viewed from the top, and is directed from the upper left to the lower right (downward to the right) when viewed from the front or rear. Tilt. The intermediate portion of the intake pipe 544 is curved so as to gently connect the vicinity of the front end portion and the vicinity of the rear end portion. Therefore, the combustion air whose amount is adjusted by the throttle body 543 flows into the intake port 601 from the upper left side through the intake pipe 544.

Next, an assembly configuration of the intake port 601 and the fuel injection device 602 will be described with reference to FIGS.
The intake port 601 of the cylinder assembly 51 is a path for supplying combustion air sent from the intake pipe 544 to the combustion chamber 606. The upstream end of the intake port 601 (here, the upstream end in the flow direction of combustion air) protrudes from the upper left part of the cylinder assembly 51 toward the upper left side (see FIG. 8 and the like). reference). This protrusion is formed integrally with the cylinder head 512. On the other hand, the downstream end of the intake port 601 (here, the downstream end in the flow direction of combustion air) is formed inside the cylinder head 512 and communicates with the front end of the combustion chamber 606. Specifically, the downstream end portion of the intake port 601 communicates with the upper portion of the center in the left-right direction of the front end portion of the combustion chamber 606. Therefore, the intake port 601 extends from the upstream end so as to be inclined obliquely downward to the right, and then extends so as to curve substantially rearward and reaches the front end of the combustion chamber 606.
As described above, the cylinder assembly 51 is provided with the intake valve 603 that opens and closes between the intake port 601 and the combustion chamber 606. The intake valve 603 has a valve body formed in a cap shape. The valve body is provided at the front end of the combustion chamber 606 so that the downstream end of the intake port 601 can be opened and closed. The intake valve 603 can employ a conventionally known configuration.

A fuel injection device 602 is provided above the cylinder head 512 (cylinder assembly 51). The fuel injection device 602 injects fuel into the intake port 601. In particular, the fuel injection device 602 is provided so that fuel can be injected toward the valve body of the intake valve 603 or in the vicinity thereof. The fuel injection device 602 is provided on the center side or the opposite side of the vehicle width center from the intake pipe 544 in the left-right direction (vehicle width direction). For example, the fuel injection device 602 is positioned on the intake pipe 544 side with respect to the center line C of the combustion chamber 606, on the center line C or in the vicinity thereof, or on the opposite side of the intake pipe 544 with respect to the center line C. (See FIG. 7 and the like). The fuel injection device 602 protrudes upward from the upper surface of the cylinder head 512. On the other hand, as described above, the upstream end of the intake port 601 protrudes from the cylinder head 512 toward the upper left side. The fuel injection device 602 and the upstream end of the intake port 601 are aligned in the left-right direction (vehicle width direction) and overlap in a side view (see, for example, FIGS. 7, 8, and 11). According to such a configuration, interference between the fuel injection device 602 and the intake port 601 can be prevented. The intake pipe 544 connected to the intake port 601 extends from the upstream end of the intake port 601 toward the upper left side. Therefore, interference between the fuel injection device 602 and the intake pipe 544 can be prevented.
Further, the fuel injection device 602 is provided directly on the cylinder head 512, not on the upstream end of the intake port 601 protruding from the cylinder head 512 or on the intake pipe 544. According to such a configuration, the position of the fuel injection device 602 can be lowered as compared with a configuration in which the fuel injection device 602 is provided in the intake port 601 or the intake pipe 544. Since the upstream end of the intake port 601 protrudes obliquely from the upper left side of the cylinder assembly 51 toward the upper left side, the fuel injection device 602 can be directly attached to the cylinder block 511.
Furthermore, according to the configuration in which the fuel injection device 602 is provided directly on the cylinder head 512, the fuel injection device 602 can be provided at a position where fuel can be injected toward the valve body of the intake valve 603 or in the vicinity thereof. That is, when the fuel injection device 602 is provided in the vicinity of the upstream end of the intake port 601 or in the intake pipe 544, the distance between the fuel injection device 602 and the main body of the intake valve 603 increases. For this reason, it is difficult to provide the fuel injection device 602 at a position where fuel can be injected toward the valve body of the intake valve 603 or in the vicinity thereof. On the other hand, according to the embodiment of the present invention, the degree of freedom of the arrangement position of the fuel injection device 602 is improved. Therefore, the fuel injection device 602 injects fuel toward the valve body of the intake valve 603 or the vicinity thereof. It can be provided at a possible position.

Here, the exhaust system 55 will be briefly described. The exhaust system 55 includes an exhaust pipe 552 and a silencer 551 (see FIG. 2). The exhaust pipe 552 is connected to the downstream end of the exhaust port 604 of the cylinder assembly 51 (here, the downstream end in the exhaust flow direction). The exhaust port 604 is a path for exhausting the exhaust gas in the combustion chamber 606. The upstream end of the exhaust port 604 is located below the front end face of the combustion chamber 606 and below the downstream end of the intake port 601. The downstream end of the exhaust port 604 is located below the cylinder block 511. The exhaust pipe 552 connects the exhaust port 604 and the silencer 551 so that the exhaust gas can flow therethrough. The silencer 551 reduces the noise of the exhaust gas sent through the exhaust port 604 and the exhaust pipe 552 and discharges it into the outside air. A conventionally known configuration can be applied to the exhaust system 55.

Next, the assembly configuration of the power unit 5 and the article storage unit 17 will be described with reference to FIGS. FIG. 13 is a front view schematically showing an assembled configuration of the power unit 5 and the article accommodating portion 17. FIG. 14 is a left side view schematically showing an assembled configuration of the power unit 5 and the article accommodating portion 17. FIG. 15 is a side view (partially including a cross section) schematically showing the positional relationship between the cylinder assembly 51 and the bottom of the article accommodating portion 17.

The front end portion of the connecting portion 56 of the power unit 5 is connected to the rear end portion of the vibration isolation link 118 of the body frame 11 so as to be swingable in the vertical direction (pitching direction). As described above, the connecting portion 56 of the power unit 5 is provided on the lower side of the cylinder assembly 51. Therefore, the power unit 5 is connected to the vibration isolation link 118 of the vehicle body frame 11 on the lower side.
As shown in FIGS. 13 to 15 and the like, an article storage unit 17 is provided on the upper side of the power unit 5. The article accommodating portion 17 is attached to the vehicle body frame 11 with screws or the like. In particular, the vicinity of the front end portion of the bottom portion of the article accommodating portion 17 is located above the frame bracket 116 of the body frame 11. Then, the vicinity of the front end portion of the bottom of the article accommodating portion 17 is attached to the upper surface of the frame bracket 116 with screws or the like. An elastic member 301 is provided between the frame bracket 116 and the article storage unit 17. The elastic member 301 alleviates vibrations and shocks transmitted from the frame bracket 116 to the article accommodating portion 17. As described above, the frame bracket 116 of the vehicle body frame 11 is formed in a substantially inverted “U” shape in front view or rear view. The vicinity of the front end of the cylinder assembly 51 enters the area surrounded by the frame bracket 116. Thus, the frame bracket 116 supports the article accommodating portion 17 from below while avoiding interference with the cylinder assembly 51 of the power unit 5.

In addition, the rear part of the article storage unit 17 is attached to the pair of left and right body tubes 113 with screws or the like. For example, the pair of left and right body tubes 113 are integrally provided with a bracket, and the article accommodating portion 17 is attached via the bracket. Note that an elastic member may be provided between the pair of left and right body tubes 113 (or a bracket provided on the body tube 113) and the article accommodating portion 17.

As shown in FIGS. 13 to 15, the bottom of the article accommodating portion 17 is located above the cylinder assembly 51. A gap is formed between the upper surface of the cylinder assembly 51 and the lower surface of the bottom portion of the article accommodating portion 17. The fuel injection device 602 protrudes upward from the upper surface of the cylinder head 512. As described above, the fuel injection device 602 is positioned between the upper surface of the cylinder assembly 51 and the lower surface of the article accommodating portion 17. Further, as shown in FIG. 15, the uppermost end of the fuel injection device 602 is positioned below a straight line H passing through the upper surface of the frame bracket 116 and the uppermost end of the throttle body 543.

Thus, the anti-vibration link 118 that connects the power unit 5 to the vehicle body frame 11 is located below the power unit 5, and the intake system 54 is located above the power unit 5. For this reason, interference with the member and apparatus which comprise the fuel-injection apparatus 602 and the intake system 54, and the structure for connecting the power unit 5 to the vehicle body frame 11 is prevented. Therefore, the degree of freedom in designing the fuel injection device 602 and the intake system 54 can be improved. In particular, the degree of freedom of arrangement positions and postures of the members and devices constituting the fuel injection device 602 and the intake system 54 is improved. Therefore, the fuel injection device 602 and the intake system 54 can be optimally configured from the viewpoint of the performance of the power unit 5.

Specifically, the intake pipe 544 communicating with the intake port 601 is attached to the intake port 601 of the cylinder assembly 51 from the diagonally upper side in the left-right direction (vehicle width direction). On the other hand, the anti-vibration link 118 and the connecting portion 56 are provided below the cylinder assembly 51. For this reason, the intake pipe 544 does not interfere with the antivibration link 118 and the connecting portion 56. Therefore, it is possible to form the intake pipe 544 in a shape in which the combustion air smoothly flows while the length of the intake pipe 544 is set to an optimum length. By increasing the length of the intake pipe 544, the output can be improved particularly at medium and low speeds. Thus, according to the embodiment of the present invention, the output of the power unit 5 can be improved.

In addition, according to the embodiment of the present invention, it is possible to prevent interference between the intake pipe 544 and the article accommodating portion 17 while improving the output of the power unit 5. Specifically, it is as follows. The anti-vibration link 118 and the connecting portion 56 are not provided on the upper side of the cylinder assembly 51. Therefore, the intake pipe 544 can be provided on the upper left side of the cylinder assembly 51. With such a configuration, the position of the intake pipe 544 can be lowered compared to a configuration in which the intake pipe 544 is provided at a position overlapping the cylinder assembly 51 in a top view. For this reason, the interference between the intake pipe 544 and the article accommodating portion 17 can be prevented or suppressed.
And with such a structure, the space of the upper surface of the cylinder assembly 51 becomes wide. For this reason, the fuel injection device 602 can be directly attached to the upper surface of the cylinder head 512. Therefore, the position of the fuel injection device 602 can be lowered. That is, when there is no space for directly attaching the fuel injection device 602 on the upper surface of the cylinder head 512, the fuel injection device 602 is connected to the downstream end (portion protruding from the cylinder assembly 51) of the intake port 601 or the intake pipe 544. It is necessary to attach to. If it does so, the position of the fuel-injection apparatus 602 will become high. On the other hand, according to the embodiment of the present invention, since the fuel injection device 602 is directly attached to the upper side of the cylinder assembly 51, the position of the fuel injection device 602 can be lowered. In particular, as shown in FIG. 15, the fuel injection device 602 can be attached below the straight line H passing through the upper surface of the frame bracket 116 and the uppermost end of the throttle body 543.

Then, by reducing the height of the fuel injection device 602 and the intake pipe 544, the following effects can be obtained.
First, since the height of the fuel injection device 602 and the intake pipe 544 can be reduced, the position of the article storage unit 17 and the seat 155 provided on the upper side of the article storage unit 17 can be reduced. For this reason, it is possible to improve the legging property. Therefore, it is possible to improve the riding performance and the stopping stability of the motorcycle 1.
Further, when the positions of the fuel injection device 602 and the intake pipe 544 are high, it is necessary to reduce the vertical dimension of the article accommodating portion 17 in order to improve the legging performance. As a result, the volume of the article accommodating portion 17 decreases. On the other hand, according to the embodiment of the present invention, it is possible to improve the footing property (or prevent or suppress the decrease) without reducing the volume of the article accommodating portion 17. As described above, according to the embodiment of the present invention, it is possible to achieve both the foot-holding property (riding property, stopping stability) and the convenience of the article storage unit 17.

Further, when the fuel injection device 602 is provided at a position lower than a straight line H passing through the upper surface of the frame bracket 116 and the uppermost end of the throttle body 543 in a side view, the bottom of the article storage unit 17 and the fuel injection Interference with the device 602 can be prevented. That is, when the fuel injection device 602 is provided at a position higher than the straight line H, in order to avoid interference between the fuel injection device 602 and the article storage portion 17, the position of the article storage portion 17 is increased, It is necessary to form a recess in the bottom of the article storage unit 17. If it does so, since the position of the sheet | seat 155 provided in the upper side of the articles | goods accommodating part 17 will become high, footiness property may fall and boarding property and stop stability may fall. Moreover, the capacity | capacitance of the goods accommodating part 17 reduces that it is the structure by which a recessed part is formed in the bottom part of the goods accommodating part 17. FIG. Therefore, the convenience of the article storage unit 17 may be reduced.
On the other hand, according to the embodiment of the present invention, since the interference between the fuel injection device 602 and the article accommodating portion 17 is prevented, there is no need to increase the position of the seat 155. Therefore, it is possible to prevent a decrease in ride comfort by preventing a decrease in footing. In addition, since it is not necessary to form a recess at the bottom of the article accommodating portion 17, it is possible to prevent a decrease in the capacity of the article accommodating portion 17. Therefore, it is possible to improve the convenience of the article storage unit 17 (or prevent the convenience from being lowered).

Further, it is well known that the fuel injection direction and injection position by the fuel injection device 602 affect the reduction of combustion gas and the improvement of fuel consumption. According to the embodiment of the present invention, the intake port 601 provided in the cylinder assembly 51 projects toward the upper left side of the cylinder assembly 51. The fuel injection device 602 is provided on the upper surface of the cylinder head 512 and above the combustion chamber 606. According to such a configuration, interference between the fuel injection device 602 and the intake port 601 can be prevented. For this reason, it is possible to improve the degree of freedom of the installation position and posture of the fuel injection device 602.
Specifically, the fuel injection device 602 can be arranged so that fuel can be injected toward the main body (shade-shaped portion) of the intake valve 603 or the vicinity thereof. That is, since the intake port 601 extends obliquely to the upper left, the intake port 601 and the intake pipe 544 do not exist above the combustion chamber 606. By providing the fuel injection device 602 above the combustion chamber 606, fuel can be injected toward the main body of the intake valve 603 or in the vicinity thereof. When the fuel is injected toward the main body of the intake valve 603, fuel consumption and output can be improved. As described above, the arrangement position and orientation of the fuel injection device 602 are not affected by the intake port 601, so that the fuel injection direction and injection position of the fuel injection device 602 can be optimized. In particular, by adopting a configuration in which the fuel injection device 602 and the intake pipe 544 are provided so as to overlap in a side view, the fuel injection position and direction can be optimized.

As mentioned above, although each embodiment of this invention was described in detail with reference to drawings, each said embodiment only showed the specific example in implementation of this invention. The technical scope of the present invention is not limited to the above embodiments. The present invention can be variously modified without departing from the spirit thereof, and these are also included in the technical scope of the present invention.
For example, although the scooter type motorcycle is shown as the scooter type vehicle, the present invention is not limited to the scooter type motorcycle. For example, the present invention can also be applied to a scooter type tricycle.

The present invention is a technique suitable for a scooter type vehicle having a swing type power unit and an article accommodating portion provided on the upper side of the power unit. And according to this invention, the improvement of the freedom degree of design of an intake system can be aimed at, and the reduction | decrease of the volume of an articles | goods accommodating part can be prevented.

Claims

Body frame,
A cylinder assembly in which a combustion chamber is formed, an intake port that is formed integrally with the cylinder assembly and serves as a path for supplying combustion air to the combustion chamber, and a fuel injection device that injects fuel into the intake port A power unit that is swingably supported by the body frame;
An intake system including a throttle body that adjusts the amount of combustion air supplied to the intake port;
An intake pipe that connects the throttle body and the intake port so that combustion air can flow;
An article storage section provided on the upper side of the power unit;
Have
The power unit is swingably supported on the vehicle body frame on the lower side,
The intake pipe communicates with the intake port obliquely from above in the vehicle width direction,
The scooter-type vehicle, wherein the fuel injection device is provided on an upper surface of a cylinder head of the cylinder assembly between the cylinder assembly and the article accommodating portion.
The intake pipe is provided at a position biased to one side from the center line in the vehicle width direction,
2. The scooter according to claim 1, wherein the fuel injection device is located at a center side or an opposite side of the vehicle width center from the intake pipe with respect to a vehicle width direction, and overlaps the intake pipe in a side view. Type vehicle.
The vehicle body frame includes a pair of left and right body tubes provided apart from each other in the vehicle width direction, and a bracket provided across the pair of left and right body tubes,
The article storage unit is attached to the bracket,
The scooter-type vehicle according to claim 1 or 2, wherein the fuel injection device is provided at a position lower than a straight line connecting an upper surface of the bracket and an uppermost end of the throttle body in a side view.