Title of Invention

STRADDLE -TYPE VEHICLE

Abstract The invention relates to a straddle-type vehicle comprising a head pipe connected to a pair of left and right main frames (16L,16R), a fuel tank (13) arranged to said main frames (16L,16R), a seat arranged rearwardly of the fuel tank (13), an air cleaner (41) arranged below the fuel tank (13), and a fuel pump (30) mounted to a mount seat (31) formed in a bottom plate (13k) of the fuel tank (13), wherein at least part of the fuel pump (30) is accommodated in the fuel tank (13), the mount seat (31) is provided on a portion (13h) of the bottom plate (13k) of the fuel tank (13), which is arranged lower than a portion (13i) of the fuel tank (13) positioned above the air cleaner (41). The air cleaner (41) arranged below a rear portion (13i) of the fuel tank (13) and the mount seat (31) is arranged forward of said rear portion (13i) of the fuel tank (13) positioned above the air cleaner (41).
Full Text STRADDLE-TYPE VEHICLE
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to a straddle-type
vehicle.
2. Description of the Related Art
Conventionally, there is known a straddle-type vehicle,
in which a seat is arranged rearwardly of a fuel tank and an
air cleaner is mounted below a rear portion of the fuel tank,
like so-called motorcycle type motorcycles, etc. With a
straddle-type vehicle of this kind, however, in association
with an arrangement of an air cleaner below a rear portion of
a fuel tank, there is a large restriction on a position, in
which a fuel tank is mounted in the fuel tank, in order to avoid
interference of a fuel pipe, which extends downward from the
fuel tank, etc. with the air cleaner.
On the other hand, a fuel (referred below to as
ineffective residue), which cannot be drawn by a fuel pump,
out of a fuel in the fuel tank is generated according to a shape
of the fuel tank and a position of the fuel pump. Therefore,
in order to reduce an ineffective residue of a fuel, the fuel
pump must be disposed in a position, in which a major part of
a fuel in the fuel tank can be drawn. Accordingly, from the
viewpoint of restricting an ineffective residue, there are


certain restrictions on a shape of the fuel tank and layout
of the fuel pump.
Hereupon, in order to heighten freedom in a mount
position of a fuel pump and to achieve reduction in ineffective
residue of a fuel, it is proposed in the following
JP-A-2002-293281 to provide an external pipe line composed of
a rubber hose, through which a fuel is supplied to a fuel pump
from a low location in a fuel tank, so as to enable drawing
a major part of a fuel even when the fuel pump is not provided
in a lower location in the fuel tank.
However, a motorcycle disclosed in JP-A-2002-293281 is
complicated in construction since there is a need for an
external pipe line below a fuel tank. Also, since the external
pipe line is present below the fuel tank, a space, in which
an air cleaner is mounted, is decreased correspondingly and
so it is difficult to enlarge a volume of the air cleaner.
SUMMARY OF THE INVENTION
The invention has been thought of in view of such point
and has its object to reduce an ineffective residue of a fuel,
simplify a construction of a fuel supply system and achieve
an increase in volume of an air cleaner in a straddle-type
vehicle, in which a seat is arranged rearwardly of a fuel tank
and the air cleaner is mounted below a rear portion of the fuel
tank.


The invention provides a straddle-type vehicle
comprising a fuel tank including a bottom plate formed with
a mount seat, to which a fuel tank is mounted, a seat arranged
rearwardly of the fuel tank, an air cleaner arranged below a
rear portion of the fuel tank, and a fuel pump mounted to the
mount seat and having at least a part thereof accommodated in
the fuel tank, and wherein the mount seat is provided on that
portion of the bottom plate of the fuel tank, which is lower
than a portion positioned above the air cleaner.
With the straddle-type vehicle, the mount seat, to which
a fuel tank is mounted, is provided on that portion of the bottom
plate (In addition, a shape of the bottom plate is not limited
to a shape of a flat plate but may of course comprise an irregular
portion and a curved portion) of the fuel tank, which is lower
than a portion positioned above the air cleaner, so that a fuel
accumulated in an upper portion of the air cleaner in the fuel
tank naturally flows down toward the mount seat. Therefore,
a fuel is not accumulated in the portion, so that an ineffective
residue of a fuel is reduced. Also, since there is no need
of providing any external pipe line below the fuel tank, it
is possible simplify a construction of a fuel supply system.
Also, even when the fuel pump is not arranged above the air
cleaner, an ineffective residue of a fuel can be reduced, so
that interference of the fuel tank (and its piping or the like)
with the air cleaner can be avoided by arranging the fuel pump


in a position except above the air cleaner. Accordingly, it
is possible to achieve an increase in volume of the air cleaner
without restrictions by the fuel pump or the like.
According to the invention, it is possible to reduce an
ineffective residue of a fuel, simplify a construction of a
fuel supply system and achieve an increase in volume of an air
cleaner in a straddle-type vehicle, in which a seat is arranged
rearwardly of a fuel tank and the air cleaner is mounted below
a rear portion of the fuel tank.
BRIEF DESCRIPTION OF THE DRAWINGS
Fig. 1 is a side view showing a motorcycle;
Fig. 2 is a side view showing a vehicle body frame;
Fig. 3 is a plan view showing the vehicle body frame;
Fig. 4 is a back view showing the vehicle body frame;
Fig. 5 is a left side view showing a fuel tank;
Fig. 6 is a bottom view showing the fuel tank;
Fig. 7 is a view showing the fuel tank and an air cleaner
as viewed from the rear;
Fig. 8 is a perspective view showing the fuel tank and
the air cleaner as viewed from rearward and leftwardly upward;
Fig. 9 is a plan view showing the fuel tank;
Fig. 10 is a cross sectional view conceptually showing
an irregular shape of a bottom surface of the fuel tank;
Fig. 11 is a right side view showing a rear arm bracket;


and
Fig. 12 is a perspective view showing a root side portion
of a main stand as viewed from forward and leftwardly downward.
DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS
An embodiment of the invention will be described below
in detail with reference to the drawings.
As shown in Fig. 1, a straddle-type vehicle according
to the embodiment is a so-called motorcycle 10. The motorcycle
10 comprises a vehicle body frame 11, a water cooled
single-cylinder engine 12 suspended from and supported on the
vehicle body frame 11, a fuel tank 13 supported on the vehicle
body frame 11, and a seat 14 . The seat 14 is arranged rearwardly
of the fuel tank 13.
As shown in Figs. 2 to 4, the vehicle body frame 11
comprises a steering head pipe 15, a pair of left and right
main frames 16L, 16R extending rearward and obliquely downward
from the steering head pipe 15, rear arm brackets 23L, 23R
joined to rear portions of the main frames 16L, 16R, a pair
of left and right back stays 17L, 17R extending rearward and
obliquely upward from the rear arm brackets 23L, 23R, and a
pair of left and right seat rails 18L, 18R extending rearward
and obliquely upward from intermediate portions of the main
frames 16L, 16R. Rear ends of the back stays 17L, 17R are
connected to rear portions of the seat rails 18L, 18R.


As shown in Fig. 1, a front fork 19 is supported on the
steering head pipe 15 to be able to swing. A steering handle
20 is provided at an upper end of the front fork 19 and a front
wheel 21 is supported rotatably at a lower end thereof.
As shown in Figs. 2 and 3, the main frames 16L, 16R are
frame members, of which a thickness in a vertical direction
is larger than that in a left and right direction (vehicle width
direction), and which are formed to assume a rectangular
cylinder having a cross sectional profile, which is lengthy
in a vertical direction. As shown in Fig. 3, the both main
frames 16L, 16R separate from each other as it goes toward
central portions 16b from front sides 16a, and are
substantially in parallel as viewed in plan view over an extent
from the central portion 16b to a rear side. As shown in Fig.
2, the front sides 16a of the main frames 16L, 16R have a vertical
thickness substantially equal to a vertical length of the
steering head pipe 15. Also, the main frames 16L, 16R are
decreased in vertical thickness as it goes toward the central
portions 16b from the front sides 16a.
As shown in Fig. 3, a cross member 24 extending in a left
and right direction (vehicle width direction) bridges the
central portion 16b of the left main frame 16L and the central
portion 16b of the right main frame 16R. Front ends 18a of
the seat rails 18L, 18R are connected to a neighborhood of
connections of the main frames 16L, 16R to the cross member


24 (see Fig. 2).
As shown in Fig. 5, the fuel tank 13 comprises a front,
upper surface 13a inclined obliquely and forwardly downward,
and a rear, upper surface 13c inclined obliquely and rearwardly
downward. A boundary portion of the front, upper surface 13a
and the rear, upper surface 13c forms an upper end 13b
positioned uppermost on an upper surface of the fuel tank 13.
Formed on both left and right sides of the fuel tank 13 are
a front side 13d, which projects laterally as it goes rearward,
and a rear side 13e, which projects laterally as it goes forward.
The rear side 13e defines a surface adjacent to crew's knees
when a crew rides. Therefore, a crew opens knees suitably to
be able to assume a posture along the fuel tank 13, so that
a crew can ride in a comfortable posture.
As shown in Fig. 7, a recess 32 dented upward as viewed
from the rear is formed on a rear portion of the fuel tank 13.
Specifically, the recess 32 on the rear of the fuel tank 13
comprises curved pieces 32a extending obliquely downward
toward both left and right sides thereof from a central side
thereof as viewed from the rear, and a projecting piece 32b
positioned between the both curved pieces 32a and projecting
rearward (see Fig. 5) . Ring-shaped brackets 32c are provided
at lower ends of the both curved pieces 32a.
While the projecting piece 32b and the curved pieces 32a
may be connected smoothly together, the projecting piece 32b


projects above the curved pieces 32a according to the
embodiment, so that a step is provided between the projecting
piece 32b and the curved pieces 32a. Therefore, the projecting
piece 32b is arranged in a higher position than the curved
pieces 32a are, and a large space is ensured below the
projecting piece 32b.
Subsequently, an explanation will be given to a mount
structure of the fuel tank 13. As shown in Fig. 3, a bracket
25 being substantially triangular-shaped as viewed in plan view
is joined to upper sides of the front sides 16a of the main
frames 16L, 16R. Mount holes 25a are formed on the bracket
25. On the other hand, as shown in Fig. 6, mount holes 33 are
formed on a bottom plate 13k of the fuel tank 13 to correspond
to the respective mount holes 25a of the bracket 25. A front
portion of the fuel tank 13 is fixed to the main frames 16L,
16R through the bracket 25 by clamping fasteners (not shown),
such as bolts, etc., to the mount holes 25a and the mount holes
33.
As shown in Fig. 8, brackets 34L, 34R, respectively,
extending upward are joined to intermediate portions of the
seat rails 18L, 18R. As shown in Fig. 7, the respective
brackets 34L, 34R comprise a pair of projecting pieces 34a,
34b, which are adjacent to each other at a predetermined
interval in a left and right direction, and the both projecting
pieces 34a, 34b project above the seat rails 18L, 18R. In


addition, the both projecting pieces 34a, 34b may be formed
integral with, or separately from each other. Mount holes 34c
(see Fig. 8) are formed on the both projecting pieces 34a, 34b
to permit fasteners such as bolts, etc. to extend therethrough.
As shown in Fig. 7, the left and right brackets 32c of the fuel
tank 13 are inserted between the both projecting pieces 34a,
34b of the brackets 34L, 34R of the seat rails 18L, 18R.
Fasteners 35, such as bolts, etc., extending through the mount
holes 34c of the both projecting pieces 34a, 34b and the
brackets 32c mount the rear portion of the fuel tank 13 to the
brackets 34L, 34R.
In addition, the fuel tank 13 is mounted to the brackets
34L, 34R to be able to turn. Therefore, in a state, in which
the front portion of the fuel tank 13 is not fixed to the main
frames 16L, 16R, the fuel tank 13 can be turned about the
brackets 32c. Thereby, the work for vehicular parts, etc.
arranged below the fuel tank 13 is facilitated by turning the
fuel tank 13 rearward to put the same in an upright state
relative to the seat rails 18L, 18R.
As shown in Fig. 5, a fuel pump 30 is arranged in the
fuel tank 13. The fuel pump 30 is positioned substantially
centrally of the fuel tank 13 in a longitudinal direction (left
and right direction in Fig. 5) . An oil filler hole 26 is formed
on the front, upper surface 13a of the fuel tank 13. A cylinder
27 having substantially the same diameter as that of the oil


filler hole 26 is provided inside the oil filler hole 26. A
stopper 28 extending in a left and right direction bridges a
lower end of the cylinder 27 so as to prevent a fuel oil gun
27a from contacting with the fuel pump 30 at the time of fueling.
Thereby, when the fuel oil gun 27a is inserted from the oil
filler hole 26, a tip end of the fuel oil gun 27a contacts with
the stopper 28 to inhibit excessive insertion of the fuel oil
gun 27a. In addition, the oil filler hole 26 is closed by a
lid 29 (see Fig. 1) except at the time of fueling.
As shown in Fig. 9, the upper end 13b of the fuel tank
13 and the fuel pump 30 overlap each other as viewed in plan
view. That is, the fuel pump 30 is arranged in the vicinity
of the upper end 13b of the fuel tank 13 and arranged in that
portion of an interior of the fuel tank 13, in which a most
space is arranged upward (also, see Fig. 5).
As shown in Fig. 5, the bottom plate 13k of the fuel tank
13 comprises a front bottom surface 13g inclined obliquely and
forwardly upward, a substantially horizontal, central bottom
surface 13h, and a rear bottom surface 13i inclined obliquely
and forwardly upward. In addition, the mount holes 33 (see
Fig. 6) described above are formed on the front bottom surface
13g. The central bottom surface 13h is positioned in a lower
location than the front bottom surface 13g and the rear bottom
surface 13i are.
As shown in Fig. 6, the central bottom surface 13h is


formed with a mount seat 31, to which the fuel pump 30 is mounted.
The mount seat 31 is formed to assume a shape of an annular
ring. A plurality (six in the embodiment) of mount holes 31a
are arranged circumferentially every predetermined interval
on the mount seat 31. As shown in Fig. 5, the fuel pump 30
is inserted into the fuel tank 13 from a central opening of
the mount seat 31 and then mounted to the mount seat 31 by
clamping fasteners, such as bolts, etc., to the mount holes
31a. Accordingly, the fuel pump 30 is mounted in a low location
in the fuel tank 13.
As shown in Fig. 6, grooves (beads) 3 6 dented upward are
formed on both left and right sides of the mount seat 31 on
the bottom plate 13k of the fuel tank 13 (also, see Fig. 10).
The grooves 36 extend in a lengthwise direction (longitudinal
direction) of the fuel tank 13.
As shown in Fig. 1, a pivot shaft 37 is provided on the
rear arm brackets 23L, 23R, and a front end of a rear arm 38
is supported on the pivot shaft 37 to be able to turn. On the
other hand, a rear wheel which is a driving wheel is supported
on a rear end of the rear arm 38 to be able to turn.
The engine 12 is supported on the main frames 16L, 16R
and the rear arm brackets 23L, 23R. The engine 12 comprises
a cylinder 65 extending forward and obliquely upward. In
addition, the cylinder referred to herein means a whole
including a cylinder body and a cylinder head. Also, the


cylinder 65 is not necessarily required to extend obliquely
upward but may extend upward. An air cleaner 41 is connected
through an intake pipe 40 to the cylinder 65 and a muffler 43
is connected thereto through an exhaust pipe 42.
One end of the intake pipe 4 0 is connected to the cylinder
65 and the other end of the intake pipe 40 is connected to the
air cleaner 41. The intake pipe 40 is arranged in a lower
position than both an upper end 65t of the cylinder 65 and an
upper end 41t of the air cleaner 41 are.
A connection 30a connected to a fuel supply pipe 61 is
formed at a lower end of the fuel pump 30. A fuel discharged
from the fuel pump 30 is conveyed to the fuel supply pipe 61
via the connection 30a to be supplied to the intake pipe 40
through the fuel supply pipe 61. As shown in Fig. 1, the
connection 30a is arranged in a higher position (a higher
position than that, in which the main frames 16L, 16R are
arranged, with the same longitudinal position as a reference)
than that, in which the main frames 16L, 16R are arranged, as
viewed in side view.
A side cover 62 is mounted to a side of the vehicle body
frame 11. The side cover 62 covers at least a part of a side
of the connection 30a. Therefore, the connection 30a cannot
be visually recognized from outside.
The air cleaner 41 is formed to assume a so-called
vertically longitudinal, substantially rectangular


parallelopiped. A vertical length of the air cleaner 41 is
larger than both a longitudinal length thereof and a left and
right length thereof. In addition, the vertical length, the
longitudinal length, and the left and right length mean maximum
lengths in a vertical direction, in a longitudinal direction,
and in a left and right direction. The intake pipe 40 is
connected to a bottom of a front surface of the air cleaner
41 and an intake portion 44 is formed above a rear side of the
air cleaner 41 (see Fig. 8) to permit an air to be drawn from
the rear. The intake portion 44 is formed with an intake port
44a, which is opened rearward, and the air cleaner 41 sucks
an air from rearward.
The air cleaner 41 is arranged below the rear portion
of the fuel tank 13. More specifically, as shown in Fig. 1,
the air cleaner 41 is arranged below the rear bottom surface
13i of the fuel tank 13 . By the way, according to the embodiment,
the rear portion of the fuel tank 13 is supported through the
brackets 34L, 34R on the seat rails 18L, 18R and no cross member
is present between the left and right seat rails 18L, 18R to
support the rear portion of the fuel tank 13. Therefore, it
is possible to arrange the air cleaner 41 upward relative to
a conventional arrangement, or to lengthen the vertical length
of the air cleaner 41 (see Fig. 8) . As shown in Fig. 8,
according to the embodiment, the upper end 41t (not shown in
Fig. 8. See Fig. 1) of the air cleaner 41 projects above the


seat rails 18L, 18R. Also, the upper end 41t of the air cleaner
41 is positioned above upper ends of the brackets 34L, 34R.
Consequently, the fuel tank 13 and the air cleaner 41 do not
overlap each other as viewed in side view.
As shown in Fig. 8, downwardly extending brackets 55 are
joined to the seat rails 18L, 18R. Outwardly extending mounts
41a are formed on both left and right sides of the air cleaner
41. The brackets 55 and the mounts 41a are formed with mount
holes 55a, through which fasteners, such as bolts, etc., are
inserted, and the air cleaner 41 is fixed to the brackets 55
by means of the fasteners. According to the embodiment, the
air cleaner 41 is supported only on the seat rails 18L, 18R
through the brackets 55.
As shown in Fig. 7, the intake portion 44 of the air
cleaner 41 is arranged below the recess 32 on the rear of the
fuel tank 13 and especially positioned just below the
projecting piece 32b of the fuel tank 13 as viewed from the
rear. The projecting piece 32b is extended rearwardly of the
intake portion 44 to cover a region above the intake portion
44.
As shown in Fig. 1, the seat 14 is supported on the seat
rails 18L, 18R (see Figs. 2 and 3) through brackets, etc. (not
shown) . The seat 14 is formed in a saddle-like manner and the
seat 14 is formed on a back side thereof with a forwardly
projecting piece 45, which covers a region above the intake


portion 44 of the air cleaner 41 and enters below the projecting
piece 32b of the fuel tank 13.
As shown in Fig. 12, a cross member 4 6 extending in a
left and right direction bridges lower ends of the left and
right, rear arm brackets 23L, 23R. A pair of left and right
brackets 47 are joined to the cross member 46 to suspend the
engine 12 therefrom. Also, a turning shaft 48a of a main stand
48 is supported on the brackets 47 to be able to turn. That
is, with the motorcycle 10, the brackets 47 serve as brackets
for the engine 12 and brackets for the main stand 48. In other
words, brackets for the engine 12 and brackets for the main
stand 4 8 are made common to each other.
As shown in Fig. 12, link brackets 49 are joined to the
brackets 47, the link brackets 49 also functioning as stoppers
for the main stand 48 . That is, when the main stand 48 is turned
from an accommodated state toward an upright state (turned in
a A direction in the figure), a stopper 48b of the main stand
48 abuts against the link brackets 49 whereby excessive turning
of the main stand 48 is inhibited and the main stand 48 is held
in a predetermined position.
Fig. 11 is a side view showing the right, rear arm bracket
23R of the motorcycle 10. A kick pedal 50 is arranged forwardly
of a lower half of the rear arm bracket 23R. Also, a stopper
51 is fixed to a lower end of the rear arm bracket 23R to inhibit
excessive turning of the kick pedal 50. At the time of kicking,


a crew develops the kick pedal 50 from the accommodated state
(state indicated by the reference numeral 50A) to step on the
kick pedal 50. Consequently, the kick pedal 50 is turned
counterclockwise as viewed from a right side. When the kick
pedal 50 is turned a predetermined angle or more, a stopper
portion 50a of the kick pedal 50 abuts against the stopper 51,
so that excessive turning of the kick pedal 50 is inhibited.
In addition, the reference numeral 50B indicates a state, in
which the kick pedal 50 is developed from the accommodated state,
and the reference numeral 50C indicates a state, in which the
kick pedal 50 is in the course of turning.
By the way, in the case where the stopper 51 for the kick
pedal 50 is provided on a crank case of the engine 12, the stopper
51 gets in the way to be liable to cause restrictions on a
position of the pivot shaft 37, or the like. In contrast,
according to the embodiment, the stopper 51 is mounted not on
a side of the engine 12 but on a side (strictly, the rear arm
bracket 23R) of the vehicle body frame 11. Accordingly,
restrictions on a position of the pivot shaft 37, or the like
become less, so that freedom in layout is increased.
As described above, with the motorcycle 10 according to
the embodiment, the mount seat 31 of the fuel tank 13 is provided
on that portion (the central bottom surface 13h) of the bottom
plate 13k of the fuel tank 13, which is lower than a portion
(the rear bottom surface 13i) positioned above the air cleaner


41. Therefore, a fuel accumulated on the rear bottom surface
13i in the fuel tank 13 naturally flows down toward the central
bottom surface 13h. Accordingly, no fuel is retained on the
rear bottom surface 13i, so that it is possible to reduce an
ineffective residue of the fuel.
Also, according to the embodiment, since it is not
necessary to provide any external pipe line below the fuel tank
13, it is possible to achieve simplification of a construction
of a fuel supply system. Also, since the fuel pump 30 is
arranged in a position except above the air cleaner 41, it is
possible to avoid interference between the fuel pump 30 and
the air cleaner 41 to achieve an increase in volume of the air
cleaner 41 without being obstructed by the fuel pump 30 and
its piping (for example, the fuel supply pipe 61, etc.).
Also, according to the embodiment, the fuel pump 30 is
positioned substantially centrally of the fuel tank 13 in the
longitudinal direction. Therefore, fluctuation of a fuel in
liquid level becomes small in the vicinity of the fuel pump
30. Accordingly, it is possible to stably supply a fuel from
the fuel pump 30.
Also, the motorcycle 10 comprises the pair of left and
right main frames 16L, 16R, respectively, of which a thickness
in the vertical direction is larger than that in the vehicle
width direction, and the connection 30a of the fuel pump 30
is arranged in a higher position than that, in which the main


frames 16L, 16R are arranged, as viewed in side view.
Accordingly, when the work for connection of pipes or wiring,
or the like for the connection 30a is performed, the main frames
16L, 16R do not get in the way. Accordingly, it is possible
to heighten the working efficiency.
Also, the motorcycle 10 comprises the side cover 62,
which covers at least a part of the side of the connection 30a
of the fuel pump 30. Therefore, it is possible to protect the
connection 60a and to maintain an outward appearance favorable .
Also, according to the embodiment, the cylinder 65 of
the engine 12 extends obliquely upward and the intake pipe 40
is arranged in a lower position than that, in which both the
upper end 65t of the cylinder 65 and the upper end 41t of the
air cleaner 41 are arranged. Therefore, an empty space is
existent above the intake pipe 40. The fuel pump 30 is
positioned between the cylinder 65 and the air cleaner 41 with
respect to a longitudinal position to be arranged in the empty
space. Accordingly, it is possible to promote arranging the
fuel pump 30 efficiently (arrangement, in which a waste space
is restricted) . Also, it becomes possible to arrange the fuel
pump 30 in a relatively low position.
Further, according to the embodiment, the engine 12 is
a single cylinder engine. Generally, a motorcycle 10 with a
single cylinder engine mounted thereon possesses a running
characteristic, which is tenacious at the time of low rotation,


and the intake pipe 40 is preferably lengthened in order to
further make the best use of the characteristic. Here, when
the intake pipe 4 0 is to be lengthened, an empty space above
the intake pipe 40 is further enlarged, so that it is possible
to further heighten freedom in arranging the fuel pump 30.
As described above, the motorcycle 10 comprises the pair
of left and right main frames 16L, 16R, respectively, of which
a thickness in the vertical direction is larger than that in
the vehicle width direction. The provision of the main frames
16L, 16R of this kind makes heat liable to work below the front
portion of the fuel tank 13 but the fuel pump 30 is not present
below the front portion of the fuel tank 13 in the embodiment.
Therefore, a passage for introduction of a travel wind is
defined below the front portion of the fuel tank 13 and a travel
wind flowing through the passage provides cooling below the
front portion of the fuel tank 13. Accordingly, although the
main frames 16L, 16R having a large thickness in the vertical
direction are provided, it is possible to inhibit heat from
working between the main frames 16L, 16R.
Also, according to the embodiment, a top of the fuel pump
30 overlaps the upper end 13b of the fuel tank 13 as viewed
in plan view. That is, the fuel pump 30 is positioned in the
vicinity of that portion of the upper surface of the fuel tank
13, which is positioned in a highest location. Therefore, a
margin is produced in a space, in which the fuel pump 30 is


mounted, so that it becomes possible to make use of even a
relatively large-sized pump. Accordingly, freedom is
increased in selecting the fuel pump 30.
According to the embodiment, the oil filler hole 26 of
the fuel tank 13 is positioned forwardly of the fuel pump 30
with respect to a longitudinal position. Accordingly, there
is less fear that the fuel oil gun 27a inserted from the oil
filler hole 26 damages the fuel pump 30 at the time of fueling.
Also, the stopper 28 is provided on the fuel tank 13 to
inhibit insertion of the fuel oil gun 27a over a predetermined
extent. Accordingly, it is possible to surely prevent contact
between the fuel oil gun 27a and the fuel pump 30.
Also, according to the embodiment, the grooves (beads)
36 dented upward are formed outwardly of the mount seat 31 on
the bottom plate 13k of the fuel tank 13. Therefore, when a
residual quantity of a fuel is decreased, a fuel once getting
over the beads 36 due to left and right movements of a vehicle
or the like can be held around the mount seat 31, so that it
is possible to stably supply a fuel from the fuel pump 30 . Also,
when the fuel tank 13 is to be molded, the grooves 36 can absorb
excess thickness of a material for the tank. That is, when
a wall left over at the time of press working or the like loses
a place to go to, there is a fear to lead to generation of
wrinkles and crazing, but it is possible according to the
embodiment that the grooves 36 can absorb a wall left over.


Accordingly, it is possible to prevent generation of wrinkles,
crazing, or the like in the fuel tank 13 at the time of molding
to improve manufacture of the fuel tank 13 in yield.
In addition, a straddle-type vehicle according to the
invention is not limited to motorcycles but may be other
straddle-type vehicles such as four-wheeled buggy, or the like.
As described above, the invention is useful for
straddle-type vehicles such as motorcycles, etc.


We Claim:
1. A straddle-type vehicle comprising a head pipe connected to a pair of left
and right main frames (16L,16R), a fuel tank (13) arranged to said main
frames (16L,16R), a seat arranged rearwardly of the fuel tank (13), an air
cleaner (41) arranged below the fuel tank (13), and a fuel pump (30)
mounted to a mount seat (31) formed in a bottom plate (13k) of the fuel
tank (13), wherein at least part of the fuel pump (30) is accommodated in
the fuel tank (13), the mount seat (31) is provided on a portion (13h) of
the bottom plate (13k) of the fuel tank (13), which is arranged lower than
a portion (13i) of the fuel tank (13) positioned above the air cleaner (41),
characterized in that
the air cleaner (41) arranged below a rear portion (13i) of the fuel tank (13)
and the mount seat (31) is arranged forward of said rear portion (13i) of the
fuel tank (13) positioned above the air cleaner (41).
2. The straddle-type vehicle as claimed in claim 1, wherein the fuel pump
(30) is positioned substantially centrally of the fuel tank (13) in a
longitudinal direction.
3. The straddle-type vehicle as claimed in claim 1 or 2, wherein the mount
seat (31) of the fuel tank (13) is provided on the central bottom surface
(13h) of the bottom plate (13k) of the fuel tank (13), which is lower than
the rear bottom surface (13i) positioned above the air cleaner (41).

4. The straddle-type vehicle as claimed in one of the claims 1 to 3,
comprising a pair of left and right frame members (16L,16R), respectively,
of which a thickness in a vertical direction is larger than that in a left and
right direction.
5. The straddle-type vehicle as claimed in one of the claims 1 to 4,
comprising a fuel supply passage (61), through which a fuel discharged
from the fuel pump (30) is led, wherein a connection (30a) is formed on a
lower portion of the fuel pump (30) to be connected to the fuel supply
passage (61).
6. The straddle-type vehicle as claimed in claim 5, wherein the connection
(30a) is arranged in a higher position than the frame members (16L,16R)
as viewed in side view.
7. The straddle-type vehicle as claimed in claim 5 or 6, comprising a side
cover (62), which covers at least a part of a side of the connection (30a).
8. The straddle-type vehicle as claimed in one of the claims 1 to 7,
comprising an engine (12) arranged forwardly of the air cleaner (41) and
having a cylinder (65) extending upward or obliquely upward, and
an intake passage (40) connected to the cylinder (65) and the air cleaner
(41) and arranged in a lower position than an upper end (65t) of the
cylinder (65) and an upper end (41t) of the air cleaner (41),
wherein the fuel pump (30) is positioned between the cylinder (65) and
the air cleaner (41) with respect to a longitudinal position.

9. The straddle-type vehicle as claimed in claim 8, wherein the engine (12) is
a single cylinder engine.
10.The straddle-type vehicle as claimed in one of the claims 1 to 9, wherein
the fuel tank (13) comprises a top (13b) positioned in an uppermost side,
and the top (13b) of the fuel tank (13) and a top of the fuel pump (30)
overlap each other as viewed in plan view.
11.The straddle-type vehicle as claimed in one of the claims 1 to 10, wherein
the fuel tank (13) is formed with an oil filler hole (26).
12.The straddle-type vehicle as claimed in claim 11, wherein the oil filler hole
(26) is positioned forwardly of the fuel pump (30).
13.The straddle-type vehicle as claimed in claim 11 or 12, wherein the fuel
tank (13) comprises a stopper (28), which inhibits insertion of a fuel oil
gun (27a) over a predetermined extend into the oil filler hole (26).
14.The straddle-type vehicle as claimed in one of the claims 1 to 13, wherein
a recess (32) dented upward is formed on the bottom plate (13k) of the
fuel tank (13) to be outside the mount seat (31) in a left and right
direction.

15.The straddle-type vehicle as claimed in one of the claims 1 to 14, wherein
the fuel pump (30) is positioned substantially centrally of the fuel tank
(13) in width direction of the vehicle.


The invention relates to a straddle-type vehicle comprising a head pipe
connected to a pair of left and right main frames (16L,16R), a fuel tank (13)
arranged to said main frames (16L,16R), a seat arranged rearwardly of the fuel
tank (13), an air cleaner (41) arranged below the fuel tank (13), and a fuel pump
(30) mounted to a mount seat (31) formed in a bottom plate (13k) of the fuel
tank (13), wherein at least part of the fuel pump (30) is accommodated in the
fuel tank (13), the mount seat (31) is provided on a portion (13h) of the bottom
plate (13k) of the fuel tank (13), which is arranged lower than a portion (13i) of
the fuel tank (13) positioned above the air cleaner (41). The air cleaner (41)
arranged below a rear portion (13i) of the fuel tank (13) and the mount seat
(31) is arranged forward of said rear portion (13i) of the fuel tank (13)
positioned above the air cleaner (41).

Documents:

01188-kol-2006 abstract.pdf

01188-kol-2006 claims.pdf

01188-kol-2006 correspondence-1.2.pdf

01188-kol-2006 correspondence.pdf

01188-kol-2006 description(complete).pdf

01188-kol-2006 drawings.pdf

01188-kol-2006 form-1.pdf

01188-kol-2006 form-18.pdf

01188-kol-2006 form-2.pdf

01188-kol-2006 form-3.pdf

01188-kol-2006 form-5.pdf

01188-kol-2006-correspondence-1.1.pdf

1188-KOL-2006-ABSTRACT.pdf

1188-KOL-2006-AMANDED CLAIMS.pdf

1188-KOL-2006-CLAIMS 1.1.pdf

1188-KOL-2006-CORRESPONDENCE 1.1.pdf

1188-KOL-2006-CORRESPONDENCE 1.2.pdf

1188-KOL-2006-CORRESPONDENCE 1.3.pdf

1188-kol-2006-correspondence.pdf

1188-KOL-2006-DESCRIPTION (COMPLETE).pdf

1188-KOL-2006-DRAWINGS.pdf

1188-KOL-2006-EXAMINATION REPORT REPLY RECIEVED.pdf

1188-kol-2006-examination report.pdf

1188-KOL-2006-FORM 1.pdf

1188-kol-2006-form 13.1.pdf

1188-KOL-2006-FORM 13.pdf

1188-kol-2006-form 18.pdf

1188-KOL-2006-FORM 2.pdf

1188-kol-2006-form 3.1.pdf

1188-KOL-2006-FORM 3.pdf

1188-kol-2006-form 5.1.pdf

1188-KOL-2006-FORM 5.pdf

1188-KOL-2006-FORM-27.pdf

1188-kol-2006-gpa.pdf

1188-kol-2006-granted-abstract.pdf

1188-kol-2006-granted-claims.pdf

1188-kol-2006-granted-description (complete).pdf

1188-kol-2006-granted-drawings.pdf

1188-kol-2006-granted-form 1.pdf

1188-kol-2006-granted-form 2.pdf

1188-KOL-2006-GRANTED-LETTER PATENT.pdf

1188-kol-2006-granted-specification.pdf

1188-KOL-2006-OTHERS-1.1.pdf

1188-KOL-2006-OTHERS.pdf

1188-kol-2006-others1.2.pdf

1188-KOL-2006-PA.pdf

1188-KOL-2006-PETITION UNDER RULR 137-1.1.pdf

1188-KOL-2006-PETITION UNDER RULR 137.pdf

1188-kol-2006-reply to examination report.pdf

abstract-01188-kol-2006.jpg


Patent Number 248318
Indian Patent Application Number 1188/KOL/2006
PG Journal Number 27/2011
Publication Date 08-Jul-2011
Grant Date 05-Jul-2011
Date of Filing 07-Nov-2006
Name of Patentee YAMAHA HATSUDOKI KABUSHIKI KAISHA
Applicant Address 2500, SHINGAI, IWATA-SHI, SHIZUOKA
Inventors:
# Inventor's Name Inventor's Address
1 HIDENORI SATAKE C/O YAMAHA HATSUDOKI KABUSHIKI KAISHA 2500, SHINGAI, IWATA-SHI, SHIZUOKA 438-85001
2 SATOSHI SUZUKI C/O YAMAHA HATSUDOKI KABUSHIKI KAISHA 2500, SHINGAI, IWATA-SHI, SHIZUOKA 438-8501
PCT International Classification Number B60P3/22; B60P3/22
PCT International Application Number N/A
PCT International Filing date
PCT Conventions:
# PCT Application Number Date of Convention Priority Country
1 2005-323447 2005-11-08 Japan