JPH03217382A - Motorcycle - Google Patents

Abstract

PURPOSE:To reconcile a capacity increment in a baggage box and an interval reduction in space between foot rests by arranging the baggage box in a position being surrounded by a steering shaft cylinder, a driving seat and an engine, and a left-right pair of foot rests at the cylinder side of the engine, respectively. CONSTITUTION:In this motorcycle, a power unit 30 consisting of an engine 32 and a transmission case 34 extending to the rear from this engine is supported on a body frame 10 so as to be vertically shakable. In the rear of this power unit 30, there is provided with a unit-swing type rear-wheel suspension system holding a rear wheel 36. In the above constitution, a saddle type driving seat 62 is installed in an upper part of the power unit 30. In addition, a baggage box 68 is installed in a position being surrounded by those of steering shaft cylinder 12, driving seat 62 and engine 32. Moreover, a left-right pair of foot rests 64 are installed at the side of a cylinder 32c of the engine 32. With this constitution, a capacity increment in the baggage box 68 and an interval reduction in the space between these foot rests 64 are reconciled.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to a motorcycle having a unit swing type rear wheel suspension.

(Background of the Invention) A motorcycle is known that has a unit swing type rear wheel suspension system in which a power unit that integrates an engine and a transmission case is pivotally attached to a body frame so as to be vertically swingable. In such a vehicle, if a luggage box is installed in the space surrounded by the steering shaft tube, driver seat, and power unit, and the width of the luggage box is increased to increase its capacity, a footrest is used. placement becomes difficult. For example, if a large-capacity luggage box is not installed at this location, a flat footrest can be installed here to create a scooter type, but if a large-capacity luggage box is installed here, This is because the width of the luggage box increases and the width of the footrest also increases, making it impossible to obtain a favorable riding posture. It is also conceivable to arrange a footrest below the crankcase of the engine, but in this case, since the width of the crankcase is usually large, the width of the footrest also increases, resulting in the same inconvenience.

(Object of the invention) This invention was made in view of the above circumstances,
When installing a luggage box in the space surrounded by the steering shaft cylinder, driver's seat, and engine, the space between the footrests should be kept sufficiently small even if the width of the luggage box is increased to increase its capacity. An object of the present invention is to provide a motorcycle that allows a comfortable riding posture to be obtained.

(Structure of the Invention) According to the present invention, the object is to pivot a power unit that integrates an engine and a transmission case extending rearward from the engine to the vehicle body frame so as to be able to swing vertically, and to attach the rear wheels to the rear of the power unit. In a motorcycle having a unit swing type rear wheel suspension system, the straddle type driver's seat is located above the power unit, and is located at a position surrounded by the steering shaft cylinder, the driver's seat, and the engine. This is achieved by a motorcycle characterized by comprising a luggage box and a pair of left and right footrests disposed on the sides of the cylinder of the engine.

(Example) Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a plan view mainly showing the frame structure, Fig. 3 is a plan view mainly showing the power unit, and Fig. 4 is the arrangement of the footrest. A sectional view taken along the TV-IV line in Fig. 1 to show the
It is a sectional view taken along the V line.

In these figures, reference numeral 10 denotes a vehicle body frame, which includes a steering shaft cylinder 12, a lower frame 14, an upper frame 16, and a seat rail 18. The lower frame 14 includes one descending tube 14a that descends obliquely downward and rearward from the steering shaft cylinder 12.
It has a cross tube 14b fixed to the rear end of the descending tube 14a, and a pair of left and right lower tubes 14c and 14d fixed to the middle of the descending tube 14a and the cross tube 14b and extending rearward. .

The upper frame 16 extends rearward almost horizontally from the steering shaft cylinder 12 and then descends, and its rear ends are connected to left and right lower tubes 14c,
1 fixed to the cross tube 14e connecting 14d.
It is formed from a book tube. As a result, lower frame 1
4 and the upper frame 16, a large space open to the left and right sides is formed, in which a luggage box 68, which will be described later, is accommodated.

The seat rail l8 is formed by a pair of left and right tubes 18a, 18b extending rearward from the descending portion of the rear part of the upper frame 16, and the middle portion of the tubes l8a, 18b is connected to the lower tube via a stay 20 (20a, 20b). 14c
, 14d.

Reference numeral 22 denotes a steering front wheel, which is held on the steering shaft cylinder 12 by a front fork 24 so as to be rotatable left and right. 26 is a steering handle.

30 is a power unit. This power unit 30 has four
The engine 32 integrates a cycle overhead camshaft single-cylinder engine 32 and a transmission case 34 extending rearward from a crankcase 32a of the engine 32.
A driving rear wheel 36 is held on the right side of the rear end. The engine 32 has a crankshaft 32b extending in the vehicle width direction, and the rotation of the crankshaft 32b is accommodated in a transmission case 34.
The signal is transmitted to the rear wheels 36 via a continuously variable belt transmission (not shown). Further, the cylinder 32c of the engine 32 protrudes forward from the crankcase 32a. This cylinder 3
As shown in FIG. 3, 2c is smaller in width than the crankcase 32a, and a cooling air duct 32d is attached to surround this sill 32c. A fan 32e is disposed on the right side of the cylinder 32c, and the fan 32e is rotated by a crankshaft 32a via a belt 32f to send cooling air into the exhaust 32d. Further, a radiator 32g is attached to the side surface of the fan 32e (FIG. 3). The engine 32 has a liquid-cooled shilling head, and the radiator 32g cools this coolant.

The front end of an arm 38 that holds the right end of the axle of the rear wheel 36 is also fixed to the crankcase 32a of the power unit 30. The rear end of this arm 38 and the rear end of the transmission case 34 are connected by a U-shaped arm 40 that detours above the rear wheel 36, and the front end of this U-shaped arm 40 is attached to the upper surface of the crankcase 32a by an arm 42. combined. As a result, the transmission case 34 or the arm 38 and the arm 40
and 42 form a substantially triangular shape in side view.

This power unit 30 is pivotally attached to the vehicle body frame 10 so as to be vertically swingable. That is, the lower tubes 14c, 14d
Brackets 44, 44 are fixed to the rear ends of the
The upper surface of the crankcase 32a is pivoted to the rear end of a link 46 held between these brackets 44, 44. A joint between the arms 40 and 42 of the power unit 30 is supported by the upper frame 16 via one cushion unit 48.

50 (50a, 50b) are a pair of left and right Airknona boxes, one of which 50a is fixed above the transmission case 34 and the other 50b is fixed above the arm 38. Both air cleaner boxes 50a and 50b are communicated with each other by rubber tubes 52, and an outside air intake port 50c is provided on the lower surface of the right air cleaner box 50b (Fig. 2).
The intake air enters the tube 52, the air cleaner box 50a on the left side, and then passes through the duct 54 to the carburetor 56.
guided by. This carburetor 56 is located above the crankcase 32a and guides the air-fuel mixture to the cylinder 32c.

58 is an exhaust muffler, which is an arm 38 on the right side of the rear wheel 36.
installed on. The exhaust from the engine 32 is carried out by the muffler 5 through an exhaust pipe 60 passing under the crankcase 32a.
8.

62 is a straddle type driver's seat, and the seat rail 18
installed on. This driving seat 62 is the engine 3
Located above 2.

64 (64a, 64b) are a pair of left and right footrests.

These footrests 64 are connected to the lower tubes 14c and 14d.
The bracket 6 descends from the left and right sides of the cylinder 32c.
6 (66a, 66b).

68 is a luggage box made of hard resin. The luggage box 68 is housed in the space between the lower frame 14 and the upper frame 16, that is, the space surrounded by the steering shaft cylinder 12, the engine 32, and the driving seat 62, as described above, and its rear part is cushioned. A rear extension portion 68c extends rearward through the left side of the unit 48. A cylindrical portion 68d extends from the rear extension portion 68c and passes under the driver seat 62 to the rear.
It becomes. The tennis racket A can be stored as shown in the imaginary line in FIG. 1, and fishing rods and the like can be inserted into the luggage box 68 from the rear by opening the lid at the rear end of the cylindrical portion 68d.

As shown in FIG. 5, this luggage box 68 has a box main body 68a with a large opening on the left side, and a lid plate 68b that closes this opening. As shown in FIG. 5, the bottom plate of the box body 68a is fixed to an appropriate number of bracket plates 70 fixed to the lower frames 14a and 14b, and the top plate of the box body 68a is
It is fixed to bracket plates 72, 72 fixed to the upper frame 14. The lower part of the lid plate 68b is attached to the lower part of the box body 68a by two sets of hinges 74, 74.
It can be opened and closed to the left using the hinges 74, 74 as fulcrums. A rubber seal 76 is attached to the opening edge of the box body 68a, and when the lid plate 68b is closed, the lid plate 68b is pressed against the seal 76 to seal the box 68 liquid-tightly.

Reference numeral 78 denotes a fuel tank, which is attached so as to straddle the upper frame 16. 80 is a cowling, and this fuel tank 78 and luggage box 6 are connected from the front of the steering shaft cylinder 12.
8 and smoothly continues to the driving seat 62. A part of the cowling 80, that is, a portion 80a facing the lid plate 68b of the luggage box 68 is fixed to the lid plate 68b side and can be opened and closed integrally with the lid plate 68b. Below the left and right sides of the cowling 80 are long resin moldings 8 from front to back.
2 and 82 are fixed, and the molding 82 on the left side is attached to the hinge 7.
4, covering 74.

Further, 84 is a battery, which is disposed below the lower tubes 14c and 14d. 86 is a main stand, which is attached to the lower surface of the power unit 30.

(Effects of the Invention) As described above, in the present invention, the footrest is located on the side of the cylinder of the power unit, so the interval between the footrests can be reduced. In other words, since the cylinder part is narrower than the crankcase part, the distance between the cylinder parts can be made smaller than in the case where a footrest is provided on the side of the crankcase or below it.4. Ru. In addition, since the luggage box is placed in a position surrounded by the steering shaft cylinder, engine, and driver's seat, even if the luggage box is widened, it will not interfere with the footrest, making it possible to increase its capacity. Therefore, it becomes possible to ensure a favorable driving posture.

[Brief explanation of drawings]

Fig. 1 is a side view of one embodiment of the present invention, Fig. 2 is a plan view showing its frame structure, Fig. 3 is a plan view showing the power unit, and Fig. 4 is a plan view showing the arrangement of the footrest. 1 is a sectional view taken along the line IV--IV, and FIG. 5 is a sectional view taken along the line V-V. 10... Vehicle body frame, 12... Steering shaft cylinder, 1
4...Lower frame, 16...Upper frame, 3
0... Power unit, 32... Engine, 32c
...Cylinder, 34...Transmission case, 36.
...Rear wheel, 64...Foot rest, 68...Luggage box.

Claims (1)

[Scope of Claims] A unit swing type rear wheel in which a power unit that integrates an engine and a transmission case extending rearward from the engine is pivotally supported on the vehicle body frame so as to be able to swing vertically, and the rear wheels are held at the rear of the power unit. In a motorcycle having a suspension system, a straddle-type driver's seat is provided above the power unit, a luggage box is provided at a position surrounded by a steering shaft cylinder, the driver's seat, and the engine, and a cylinder of the engine is provided. A motorcycle characterized by comprising a pair of left and right footrests arranged laterally.