JP4418446B2 - Motorcycle - Google Patents

Description

  The present invention relates to an arrangement structure of an engine intake system and a storage box of a motorcycle.

Some motorcycles have an engine and a storage box arranged under a seat, like a scooter type motorcycle. As this type of motorcycle, an “air cleaner case for a scooter type vehicle” is known (see, for example, Patent Document 1).
Japanese Patent No. 2525573

In the conventional technique, as shown in FIG. 2 of the publication, an air cleaner case 29 is arranged at the rear of the engine body 25 (the numbers are quoted in the publication, the same applies hereinafter), and the engine body. The chambers 41 and 42 are disposed in front of the chamber 25, and the chamber 42 is connected to the air cleaner case 29 via a connecting tube 37. The chamber 41 is integrally provided in the chamber 42, and the carburetor 27 is disposed in the chamber 41. The intake port of the engine main body 25 is connected via this.
Further, as shown in FIG. 1 of the same publication, the above prior art is that a power unit 13 incorporating a power transmission device in an engine is attached to a body frame 2 under a tandem seat 24 so as to be able to swing up and down. is there.

In the above-described conventional technology, the engine intake system such as the air cleaner case 29 and the chambers 41 and 42 preferably has a relatively large capacity so that the performance of the engine main body 25 is sufficiently exhibited.
By the way, in a general scooter type motorcycle such as the above-described prior art, a storage box (not shown) is often disposed under the tandem seat 24. In view of its role, the storage box is preferably as large as possible. However, the arrangement space under the seat is limited. If a large-capacity engine intake system or a large-capacity storage box is simply disposed under the seat, the tandem seat 24 must be raised in order to secure an arrangement space. The tandem seat 24 cannot be simply raised or lowered due to the footwear performance.

  An object of the present invention is to provide a technique capable of increasing the capacity of an engine intake system and the capacity of a storage box without increasing the height of a seat.

The invention according to claim 1 is a crankcase, an engine that extends forward from the crankcase and is fixed to the vehicle body so as not to swing , an exhaust pipe that extends rearward from the cylinder, and a rear end of the exhaust pipe An exhaust silencer connected to the storage box, a storage box disposed below the seat and provided to be inclined rearward, and an intake passage extending rearward from the upper part of the cylinder, connected to the intake passage, An air cleaner is provided between the seat and the exhaust silencer in a side view and is provided so as to extend upward and rearward from the front portion of the storage box along the storage box inclined rearwardly. It is characterized by being.

The invention according to claim 1 is characterized in that the air cleaner bulges the inner surface of the vehicle so as to overlap the storage box in plan view.

In the invention according to claim 1 , the air cleaner is characterized in that the outer surface of the vehicle bulges up to the outermost end of the exhaust silencer so as to overlap the exhaust silencer in plan view.

The invention according to claim 2 is characterized in that the seat is a tandem seat, and the storage box is configured to store two helmets in the front-rear direction .

  In the invention according to claim 1, since the motorcycle includes an air cleaner that is connected to the intake passage and is disposed between the seat and the exhaust silencer in a side view, the engine intake air including the air cleaner and the intake passage is provided. There is an advantage that the system and the exhaust system including the exhaust pipe and the exhaust silencer can be arranged by effectively using the excess space under the seat, and can be arranged at the optimum positions that do not interfere with each other.

In the invention according to claim 1 , since the air cleaner bulges the inner surface of the vehicle so as to overlap the storage box in plan view, the capacity of the engine intake system can be increased without increasing the seat height. Can do.

In the invention according to claim 1 , since the air cleaner bulges the vehicle outer surface with the outermost end of the exhaust silencer as a limit so as to overlap the exhaust silencer in plan view, the exhaust system is arranged. The capacity of the engine intake system can be increased without influencing, and the vehicle outer surface of the air cleaner can be protected from a stepping stone or the like by the exhaust silencer.

In the invention according to claim 2 , the seat is a tandem seat, and the storage box is configured to be capable of storing two helmets in the front-rear direction, so the capacity of the storage box can be increased .

  The best mode for carrying out the present invention will be described below with reference to the accompanying drawings. “Front”, “Rear”, “Left”, “Right”, “Up”, “Down” follow the direction seen from the driver, Fr is front, Rr is rear, L is left, R is right , CL indicates the vehicle body center (vehicle width center). The drawings are to be viewed in the direction of the reference numerals.

FIG. 1 is a left side view of a motorcycle according to the present invention.
The motorcycle 10 includes a body frame 11, a front fork 13 attached to the head pipe 12 of the body frame 11, a front wheel 14 attached to the front fork 13, a handle 15 connected to the front fork 13, and a rear part of the body frame 11. An engine 16 attached to the engine 16, a power transmission mechanism 17 attached to the engine 16 so as to be able to swing up and down, a rear wheel 18 attached to the power transmission mechanism 17, and a rear end in which a rear end portion of the power transmission mechanism 17 is suspended from the body frame 11. The scooter type motorcycle includes a cushion unit 19, a storage box 21 attached to the upper rear portion of the vehicle body frame 11, and a seat 22 disposed on the storage box 21 and attached to be openable and closable. The sheet 22 is a tandem sheet.

  Furthermore, the motorcycle 10 has a body frame 11 covered with a body cover 30. The body cover 30 includes a front cover 31 that covers the front portion of the head pipe 12, an inner cover 32 that covers the rear portion of the front cover 31, left and right low-floor footrest plates (floor steps) 33 on which the driver's feet are placed, Left and right floor skirts 34 extending downward from the outer edge of the low floor type footrest plate 33, a center cover 35 extending rearward from the inner cover 32 and covering the longitudinal center of the vehicle body frame 11, and extending rearward from the center cover 35 11 and a rear cover 36 covering the rear part.

  In the figure, 37 is a handle cover, 38 is a front fender, 39 is a rear fender, 41 is a wind screen, 42 is an engine cooling radiator, 43 is a fuel tank, 44 is a passenger step, 45 is an air cleaner, 46 is a connecting tube (connection) Tube), 47 is an air chamber, 48 is an engine exhaust pipe, and 49 is an exhaust silencer.

  The engine 16 has an exhaust system including an exhaust pipe (engine exhaust pipe) 48 and an exhaust silencer 49.

FIG. 2 is a left side view of the engine and the power transmission mechanism according to the present invention.
The engine 16 is a four-cycle two-cylinder water-cooled engine in which a cylinder 54 extends forward from the crankcase 52. Let the axis of the cylinder 54 be L1.

3 is a cross-sectional view taken along line 3-3 of FIG.
The case portion of the engine 16 includes a crankcase 52 formed by bolting the left and right case halves 51L and 51R, a cylinder block 53 bolted to the front of the crankcase 52, and a left and right two provided in the cylinder block 53. Cylinders 54, 54, a cylinder head 55 bolted to the front of the cylinder block 53, combustion chambers 56, 56 formed in the cylinder head 55, a head cover 57 bolted to the front of the cylinder head 55, It consists of a valve operating chamber 58 formed between the cylinder head 55 and the head cover 57.
The engine 16 further includes a crankshaft 61 that is rotatably attached to the crankcase 52 and extends to the left and right, and pistons 63 and 63 that are connected to the crankshaft 61 via connecting rods 62 and 62 and reciprocate in the cylinders 54 and 54. The valve operating mechanism 64 is housed in the valve operating chamber 58.

The generator cover 66 is bolted to the right side of the right case half 51R to form a generator storage chamber 67 between the right case half 51R and the generator cover 66, and the generator 68 is installed in the generator storage chamber 67. Stowed. The generator 68 is connected to the right end portion of the crankshaft 61.
Since the generator cover 66 is fixed to the crankcase 52, it is assumed that it is a part of the crankcase 52 in the present invention.

The power transmission mechanism 17 is attached to the left case half 51L via a bearing 71 so that the front part can swing up and down and the rear part of the transmission mechanism case 72 is closed. 73, a transmission mechanism storage chamber 74 formed between the transmission mechanism case 72 and the case cover 73, and a transmission mechanism 75 stored in the transmission mechanism storage chamber 74. The transmission mechanism case 72 is formed with a boss 76 that protrudes from the middle of the longitudinal direction toward the center of the vehicle width.
The transmission mechanism 75 is a combination structure of a belt-type transmission mechanism 75A connected to the crankshaft 61 and a gear mechanism 75B connected to the belt-type transmission mechanism 75A, and connects the rear wheel axle 77 to the output side of the gear mechanism 75B. In addition, the rear wheel axle 77 is rotatably supported. Reference numeral 78 denotes a cover.

On the other hand, the generator cover 66 has a front arm 81 attached so that it can swing up and down. Specifically, a support shaft 82 is integrally provided at the front portion of the front arm 81, and the support shaft 82 is rotatably supported on the generator cover 66 via a bearing 83.
The front arm 81 extends rearward, and a boss portion 84 projects from the rear end of the crankcase 52 along the rear portion of the crankcase 52 toward the center of the vehicle width. It is combined with. Further, the front arm 81 is formed by connecting a rear arm 86 to the rear portion with a bolt 87. The rear arm 86 extends rearward, and a rear wheel axle 77 is rotatably supported at the rear end thereof.

  Such a combined structure of the transmission mechanism case 72 and the front and rear arms 81 and 86 forms a rear fork 88 that is substantially H-shaped in plan view. Therefore, the front portion of the rear fork 88 that supports the rear wheel 18 via the rear wheel axle 77 can be attached to the crankcase 52 so as to be able to swing up and down. The rear fork 88 is obtained by matching the center P1 of the crankshaft 61 with the swing center P2. P3 is the center of the rear wheel axle 77.

  Further, this figure shows that brackets 89 and 89 for connecting the lower portions of the left and right rear cushion units 19 and 19 are provided at the rear end of the transmission mechanism case 72 and the rear end of the rear arm 86.

  Here, returning to FIG. The cylinder head 55 is formed integrally with an intake port 92 connected to the combustion chamber 56 and provided with an intake valve 91, and an exhaust port 94 connected to the combustion chamber 56 and provided with an exhaust valve 93. When the engine 16 is viewed from the side, the intake port 92 is an upward opening, and the exhaust port 94 is a downward opening.

An inlet pipe 95 connected to the intake port 92 extends rearward of the cylinder head 55, and a throttle valve 96 is connected to the rear end (upstream end). The upstream end of the throttle valve 96 faces rearward. The inlet pipe 95 is provided with a fuel injection device (injector) 97 that injects fuel toward the intake valve 91.
Such a combined structure of the intake port 92, the inlet pipe 95 and the throttle valve 96 forms an intake passage 98. In other words, the intake passage 98 is extended from the upper part of the cylinder 54 to the rear, and the intake port of the intake passage 98 is directed rearward.
Reference numerals 59 and 59 denote camshafts of the valve operating mechanism 64.

FIG. 4 is a left side view of the engine and the intake system of the engine according to the present invention, in which the engine 16 and the storage box 21 are arranged under the seat 22 and the air chamber 47 is arranged above the crankcase 52. Indicates.
An intake system 90 of the engine 16 (hereinafter referred to as “engine intake system 90”) connects an intake port 47a of an air chamber 47 to an outlet 45a of an air cleaner 45 via a connecting tube 46 serving as a communication path. By connecting the upstream end 96a of the throttle valve 96, that is, the intake port of the intake passage 98, to the outlet 47b of 47, the outside air is taken into the combustion chambers 56, 56 (see FIG. 2).

FIG. 5 is a plan view of the intake system and the storage box of the engine according to the present invention, and shows that the storage box 21 is disposed behind the air chamber 47 and the air cleaner 45 is disposed on the right side of the storage box 21.
The air chamber 47 is a distribution chamber that evenly distributes the air from the air cleaner 45 to the two combustion chambers 56 and 56 (see FIG. 3) via two branched left and right intake passages 98 and 98.

The air cleaner 45 includes a vehicle inner surface 45b bulging so as to overlap the storage box 21 in a plan view (the state shown in FIG. 5), and an exhaust silencer so as to overlap the exhaust silencer 49 in a plan view. A vehicle outer surface 45c that bulges up to the outermost end 49a of 49.
Further, the air cleaner 45 is disposed so as to straddle the one side 45d and the other side 45e of the air cleaner 45 so as to overlap the storage box 21 and the exhaust silencer 49 in plan view.

  The air taken in from the air cleaner 45 by the intake negative pressure of the engine passes through the connecting tube 46 → the air chamber 47 → the throttle valves 96 and 96 → the inlet pipes 95 and 95 into the combustion chambers 56 and 56 of the engine 16 shown in FIG. enter.

  Summarizing the above description, as shown in FIGS. 4 and 5, the present invention is as follows. (1) By extending the cylinder 54 forward from the crankcase 52, the crankcase 52 is placed above the seat 22 and below the seat 22. A space is provided, the air chamber 47 is disposed in the surplus space, (2) the storage box 21 is disposed in the surplus space behind the air chamber 47 and below the seat 22, and (3) the side of the storage box 21 and The air cleaner 45 is disposed in the surplus space below the seat 22, and (4) the surplus space formed above the cylinder 54 and below the seat 22 is used to take the intake passage 98 from the upper part of the cylinder 54 to the rear. And the outlet 47b of the air chamber 47 is connected to the intake port 96a of the intake passage 98. (5) As shown in FIG. At the connecting tube 46 leading been to bypass the section corners, characterized in that connecting the air cleaner 45 and the air chamber 47.

In this way, the storage box 21 and the engine intake system 90 can be easily arranged by effectively using the excess space under the seat 22. For this reason, the storage box 21 and the engine intake system 90 can be disposed at an optimal position where they do not interfere with each other.
Therefore, the capacity of the engine intake system 90 necessary for exhibiting the performance of the engine 16 can be sufficiently increased. Further, the capacity of the storage box 21 can be increased. Moreover, there is no need to increase the height of the sheet 22. By maintaining the height of the seat 22, the passenger can easily get on and off.

In the above embodiment of the present invention, the motorcycle 10 is not limited to the scooter type motorcycle.
In the above-described embodiment, the engine 16 is fixed to the vehicle body frame 11 (vehicle body). However, in the present invention, the engine 16 and the power transmission mechanism 17 (power transmission system) are integrally configured to form the vehicle body frame 11. It can also be applied to a motorcycle 10 (vehicle) of a unit swing type that is supported so as to be swingable.

  The motorcycle of the present invention is suitable for a scooter type motorcycle.

Left side view of a motorcycle according to the present invention. Left side view of an engine and a power transmission mechanism according to the present invention 3-3 sectional view of FIG. The left side view of the engine and the intake system of the engine according to the present invention The top view of the intake system and storage box of the engine which concerns on this invention

Explanation of symbols

  DESCRIPTION OF SYMBOLS 10 ... Motorcycle, 11 ... Body frame, 16 ... Engine, 21 ... Storage box, 22 ... Seat, 45 ... Air cleaner, 46 ... Communication path (connecting tube), 47 ... Air chamber, 47a ... Air chamber inlet, 52 ... Crankcase, 54 ... Cylinder, 90 ... Engine intake system, 98 ... Intake passage, 96a ... Intake port of intake passage (upstream end of throttle valve 96).

Claims (2)

Crankcase, an engine that is non-pivoting fixed to the vehicle body cast cylinder forward from the crank case, and an exhaust pipe extending in the vehicle rearward from the cylinder, for connecting exhaust to the rear end of the exhaust pipe A silencer, a storage box that is disposed below the seat and is inclined to rise rearward, and an intake passage that extends rearward from the top of the cylinder ,
The storage box is connected to the intake passage, is disposed between the seat and the exhaust silencer in a side view , and extends upward and backward from the front portion of the storage box along the storage box inclined rearward. the motorcycle is equipped with a cleaner that is provided so as to,
The air cleaner bulges the inner surface of the vehicle so as to overlap the storage box in plan view, and limits the outer surface of the vehicle to the outermost end of the exhaust silencer so as to overlap the exhaust silencer. Bulge as and
The motorcycle according to claim 1, wherein the air cleaner is provided so as to overlap the storage box in a side view. The sheet is a tandem sheet;
The motorcycle according to claim 1, wherein the storage box is configured to store two helmets in the front-rear direction.

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