JPH03217383A - Motorcycle - Google Patents

Abstract

PURPOSE:To extend the rear part of a baggage box to the rear through the side of cushion unit as well as to make a long load stowable by setting up the cushion unit, supporting a power unit, on the upper part in front of a rear wheel as single. 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 movable. In a rear part 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, the power unit 30 is supported by one cushion unit 48 situated at the upper part in front of the rear wheel 36. On the other hand, a rear part 68c of the baggage box 68 is extended to the rear through the side of this cushion unit 48.

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 vehicles, it has been considered to arrange a large-capacity luggage box in the space between the steering axes, the driver's seat, and the power unit. In this case, it is difficult to ensure a large length of the luggage box in the front and back direction. For this reason, it has been difficult to provide a luggage box that can accommodate long items such as tennis rackets, fishing rods, baseball bats, and the like.

(Object of the invention) This invention was made in view of the above circumstances,
When installing a luggage box in the space between the steering axis, the driver's seat, and the engine, the front and rear lengths of the luggage box are made thicker to make it possible to store long items. The aim is to provide motorcycles with improved performance.

(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 holding a straddle type driver's seat disposed above the power unit 1 and a position surrounded by the steering axis, the driver's seat, and the engine. The power unit is supported by one cylindrical cushion unit located above the front of the rear wheel, and the rear part of the luggage box extends rearward through the side of the cushion unit. This is achieved by a motorcycle that is characterized by the following features:

(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. IV-IV&? in Figure 1 to show The sectional view, FIG. 5, is a sectional view taken along the line V-V.

In these figures, the reference numeral 10 is a vehicle body frame, which includes a steering shaft 12, a lower frame 14, an upper frame 16, and a seat rail 18. The lower frame 14 has one descending tube 14a that descends diagonally downward and rearward from the steering shaft gap 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 coaxial space 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 l6, a large space open to the left and right sides is formed, and a luggage box 68, which will be described later, is accommodated in this space.

The seat rail 18 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 18a, 18b connects to the lower tube 14c via a stay 20 (20a, 20b).
, 14d.

A front steering wheel 22 is held between the steering axes 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 integrates a forced air-cooled four-stroke 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. The engine 32 has a crankshaft 32b extending in the vehicle width direction, and the rotation of the crankshaft 32b is transmitted to the rear wheels 36 via a belt continuously variable transmission (not shown) housed in a transmission case 34. Also, the cylinder 32c of the engine 32
protrudes forward from the crankcase 32a. This shilling 32c is attached to the crankcase 3 as shown in FIG.
The width of this cylinder 32c is smaller than the width of cylinder 2a.
A cooling air duct 32d is installed so as to surround the cooling air duct 32d.

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 duct 32d. Also, on the side of this fan 32e is a radiator 32.
g is attached (Figure 3). This engine 32 has a liquid-cooled cylinder head, and the radiator 3
2g is for cooling this cooling liquid.

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 l6 via one cushion unit 48.

50 (50a, 50b) are a pair of left and right air cleaner 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 a rubber tube 52, and the intake air entering from the outside air intake port 50c (Fig. 2) provided on the bottom surface of the right air cleaner box 50b is sent to the tube 52 and then to the left air cleaner box 50a. and is further led to a vaporizer 56 by a duct 54. 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.
Guided by 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 shilling 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 axis 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.
is installed protrudingly. The tennis racket A can be stored as shown in the imaginary line in Figure 1, and fishing rods can be stored in the cylindrical part 68d.
The lid at the rear end can be opened to allow insertion into the luggage box 68 from the rear.

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. The bottom plate of the box body 68a includes the lower frame 14a,
The upper plate of the box body 68a 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, and can be opened and closed to the left using the hinges 74, 74 as a fulcrum. Note that the box body 68a
A rubber seal 76 is attached to the opening edge of the box 68, and when the cover plate 68b is closed, the cover 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 l6. 80 is a cowling, and this fuel tank 78 and luggage box 6 are connected from the front of the steering axis 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. A main stand 86 is attached to the lower surface of the power unit 3o.

Therefore, when the lid plate 68b of the luggage box 68 is opened to the side as shown in FIG. 5, the opening of the box body 68a is exposed on the side. When storing a long piece of luggage, such as a tennis racket A, through this opening, the grip side of the racket A can be stored at the rear extension 68c of the storage box 68, as shown by the phantom line in FIG.
can be placed in the storage box 68 while being inserted into the storage box 68. A fishing rod or 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.

In this embodiment, the cushion unit is disposed near the center in the width direction of the vehicle body as shown in FIG. 3, but the present invention is not limited to this. The rear extension of the luggage box may be located on the opposite side. Further, the rear extension portions 68c may be provided on both left and right sides.

(Effects of the Invention) As described above, in this invention, the single cushion unit supporting the power unit is positioned above the front of the rear wheels, and therefore it is placed between the steering axes and in a position surrounded by the driver's seat and the engine. The rear part of the provided luggage box can extend rearwardly through the cushion unit laterally. Therefore, it becomes possible to store long items using this rear extension.

4.

[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. DESCRIPTION OF SYMBOLS 10... Vehicle body frame, 12... Between steering axes, 30... Power unit, 32... Engine, 34... Transmission case, 36... Rear wheel, 48... Cushion unit, 68
... Luggage box, 68c... Rear extension.

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. A motorcycle having a suspension system, comprising: a straddle-type driver's seat disposed above the power unit; and a luggage box provided between the steering shafts and at a position surrounded by the driver's seat and the engine; A motorcycle characterized in that the unit is supported by one cylindrical cushion unit located above and in front of the rear wheel, while the rear part of the luggage box extends rearward through the side of the cushion unit. .