CRANE VEHICLE
BACKGROUND
1. Technical Field
[0001]
The present invention relates to a crane vehicle, and more
particularly, to a crane vehicle being capable of moving while
suspending goods.
2. Related Art
[0002]
Conventionally, a crane vehicle as shown in Fig. 6 has
been known, which includes a front frame 910 and a rear frame
920. The front frame 910 has a front axle 913 with right and
left wheels 93a and a telescopic boom 911 to suspend a hook.
The rear frame 920 has a rear axle 923 with right and left wheels
93b and a driver's cabin 921 having a driver's sheet 925 for
driving and crane operation.
[0003]
The crane vehicle 900 is provided with a derricking
cylinder 917 between the front axle 913 and the telescopic boom
911. This derricking cylinder 917 can freely derrick the
telescopic boom 911. The crane vehicle 900 can suspend'goods
from the telescopic boom 911 while stopping. Alternately, the
crane vehicle 900 can move while suspending goods from the
telescopic boom 911.
[0004]
As shown in Fig. 6, the crane vehicle 900 bears most of
the weight of the telescopic boom 911 and also the weight of
the suspended goods by one axle (front axle 913) below the
telescopic boom 911.
[0005]
However, to bear the weight of the telescopic boom 911
and also the weight of the suspended goods, a single axle (front
axle 913) has a limitation in the bearing capability to retain
the posture of the crane vehicle 900. Therefore, with the crane
vehicle 900 having a single axle (front vehicle 913), it is not
possible to increase the entire crane vehicle in size, for
example, increasing the. telescopic boom 911 in size, or
increasing the weight of the suspended goods.
[0006]
In actual sites of work, there has been a problem of
stability such that a crane vehicle often suspends goods having
a weight over its bearing capability, and therefore breaks the
balance of its weight.
[0007]
For bearing the weight of the telescopic boom 911 and also
the weight of the suspended goods by a single axle (front axle
913) , there is a method of using high-performance wheels having
a high bearing capability to retain the posture of the crane
vehicle 900. However, when these wheels having a high bearing
capability is employed, there have been problems of cost, market
circulation and so forth, and therefore are not realistic.
SUMMARY
[0008]
In view of the above-described problems, it is therefore
an object of the present invention to provide a crane vehicle
that can improve the bearing capability to retain the posture
of a crane vehicle and also improve the stability of the crane
vehicle in its longitudinal direction, and, moreover, can move
while suspending heavy goods.
[0009]
To solve the above-described problems, according to a
first aspect of the present invention, a crane vehicle includes :
a first frame having an upper part in which a boom that can be
derricked is provided, and a lower part in which an axle and
wheels are provided to allow the crane vehicle to run, the wheels
being provided on right and left sides of the axle; and a second
frame having an upper part in which a driver' s cabin is provided,
and a lower part in which an axle and wheels are provided to
allow the crane vehicle to run, the second frame being connected
to the first frame to be able to bend right and left with respect
to the first frame, via a pin as a rotation axis which extends
in a vertical direction. The first frame includes: an inclined
part that inclines downward from a base end of the boom from
which the boom is derricked; and a plurality of axles provided
below the inclined part in a longitudinal direction.
[0010]
According to a second aspect of the present invention,
two wheels are provided on each ends of at least a rear axle
of the plurality of axles.
[00113
According to a third aspect of the present invention, the
first frame includes a derrick cylinder that has an upper part
connected to the boom and derricks the boom; the first frame
has two axles; the two wheels are provided on each end of the
a front axle; and a lower end of the derrick cylinder and a lower
end of the inclined part are fixed to the center between the
two axles in the longitudinal direction.
[0012]
According to a fourth aspect of the present invention,
one wheel is provided on each end of an axle other than the rear
axle of the plurality of axles; and right and left wheels of
the axle other than the rear axle are provided on same positions
as positions of respective outer wheels provided on the rear
axle.
[0013]
According to a fifth aspect of the present invention, the
first frame includes a derrick cylinder that has an upper part
connected to the boom and derricks the boom; the first frame
has two axles; and a lower end of the derrick cylinder and a
lower end of the inclined part are fixed to a position that allows
a load distribution on each wheel of the two axles to be uniform.
[0014]
With the present invention, the first frame has a plurality
of axles, and therefore the bearing capability to retain the
posture of a crane vehicle is higher than in a case in which
the first frame has a single axle. By this means, it is possible
to increase the entire crane vehicle in size, and therefore
increase the weight of the suspended goods. In addition, the
total number of the left and right wheels increases, and
therefore it is possible to improve the lateral stability of
the crane vehicle when the crane vehicle is running. Moreover,
it is possible to produce the same effect in the corners.
[0015]
Then, the total weight of the crane vehicle is increased
because of a plurality of axles, and therefore the stability
moment is increased. As a result, it is possible to increase
the length of the boom. Moreover, it is possible to improve
the stability of the crane vehicle in its longitudinal direction
during work.
[0016]
Furthermore, by using a plurality of axles, there is no
need to use high-performance wheels having a high bearing
capability to retain the posture of the crane vehicle, so that
it is possible to minimize the cost.
BRIEF DESCRIPTION OF THE DRAWINGS
[0017]
Fig. 1 is a side view showing a crane vehicle according
to Embodiment 1 of the present invention;
Fig. 2 is a schematic side view, showing a layout of the
axles and the wheels according to Embodiment 1 of the present
invention;
Fig. 3 is a schematic plan view showing a layout of the
wheels according to Embodiment 1 of the present invention;
Fig. 4 is a schematic plan view showing a layout of the
wheels according to Embodiment 2 of the present invention;
Fig. 5 is a schematic side view showing a layout of the
axles and the wheels according to Embodiment 2 of the present
invention; and
Fig. 6 is a side view showing a crane vehicle according
to a conventional embodiment.
DESCRIPTION OF EXEMPLARY EMBODIMENTS
[0018]
(Embodiment 1)
Now, the embodiments of the present invention will be
described in detail with reference to the drawings. Here, the
same or equivalent components are assigned the same reference
numerals, and overlapping descriptions will be omitted. Fig.
1 to Fig. 3 show Embodiment 1 of the present invention.
[0019]
As shown in Fig. 1, a crane vehicle 1 includes first frame
10 having a boom 11, and a second frame 20 having a driver's
cabin 21 for driving and crane operation.
[0020]
The first frame 10 has a lower frame 10a that extends in
the longitudinal direction (right and left in Fig. 1), and an
inclined part. 10b that obliquely extends downward from the base
end of the boom 11 above the lower frame 10a, to the front side
of the lower frame 10a on which a first axle 13 and a second
axle 14 are mounted. The lower frame 10a and the inclined part
10b are coupled to one another in the front side of the first
frame 10. Meanwhile, the lower frame 10a and the inclined part
10b overlap one another and have a predetermined distance between
them in vertical direction in the back side. Here, the lower
frame 10a is coupled to the lower surface of a bottom frame 20b
described later.
[0021]
A rear gradient part 9 that obliquely extends downward
from the upper end of the inclined part 10b to the back side,
is provided behind the inclined part 10b. The rear inclined
part 9 is connected to the upper part of an installation frame
(not shown) of the second frame 2 0 described later.
[0022]
A multistage, telescopic boom 11 is pivotably supported
on the upper end.of the inclined part 10b such that the boom
11 can be derricked. The boom 11 stretches or shrinks by a
built-in telescopic cylinder (not shown) . The illustrated boom
11 has a winch 12 around which a wire rope (not shown) is wound,
which protrudes from the rear end of the boom 11. By winding
up and down the wire rope, the winch 12 can lift and down a hook
7 that is connected to the tip of the wire rope and is suspended
from the tip of the boom 11.
[0023]
The derrick cylinder 17 is connected between the base end
side of the boom 11 pivotably supported by the inclined part
10b and the center between the first axle 13 and the second axle
14 in the longitudinal direction. The boom 11 can be derricked
by stretching and shrinking the derrick cylinder 17.
[0024]
As shown in Fig. 2, which is a schematic side view, the
lower end of- the derrick cylinder 17 and the lower end of the
inclined part 10b are fixed to the center of the distance (L
in the figure) between the first axle 13 and the second axle
14 on the lower frame 10a in the longitudinal direction. Here,
in practice, taking into account of the convenience of the design,
for example, the angle of the inclined part 10b, the angle for
attaching the derrick cylinder 17 and the output of the derrick
cylinder 17, the position to which the lower ends of the derrick
cylinder 17 and the inclined part 10b are fixed, may be shifted
from the center to a certain degree.
[0025]
Fig. 2, which is a schematic side view, shows that the
lower end of the derrick cylinder 17 extends to the lower frame
10a. However, actually, as shown in Fig. 1, the lower end of
the derrick cylinder 17 is rotatably connected to a bracket 18
fixed to the inclined part 10b through a pin.
[0026]
Now, a layout of the wheels 3 and 4 with respect to the
first axle 13 and the second axle 14 will be explained with
reference to Fig. 3, which is a schematic plan view. As shown
in Fig. 3, two wheels are provided on the right and left ends
of each of the first axle 13 and the second axle 14. These eight
wheels in total bear the weight to be loaded on the first axle
13 and the second axle 14, among the total weight of the crane
vehicle 1.
[0027]
The second frame 20 has a lower frame 20a that extends
in the longitudinal direction (right and left in Fig. 1); a bottom
frame 20b provided under the lower frame 20a; side frames 20c
provided on the right and left sides of the bottom frame 20b;
and an installation frame (not shown) that is bridged over the
upper parts of the right and left side frames 20c. The lower
frame 20a has a third axle 15 with a drive wheel 5 in the back
side, and has an engine E that drives the wheel 5, and also drives
a hydraulic actuator, such as the derrick cylinder 17, a telescopic
cylinder (not shown) and the winch 12 in the front side.
[0028]
As shown in Fig. 1, the side frames 20c are provided on
the right and left sides' of the bottom frame 20b, each of which
extends upward from the front end and the rear end of the bottom
frame 20b to the point that is the center of the bottom frame
20b in the longitudinal direction. The right and left side
frames 20c are provided to extend upward in both right and left
sides of the bottom frame 20b, and the installation frame (not
shown) is bridged between the respective upper parts of the side
frames 20c. The engine E extends forward from the driver' s cabin
21 and is placed between the right and left side frames 20c.
[0029]
In addition, the driver' s cabin 21 is provided behind the
engine E. The driver' s sheet 25 on which the driver who operates
the crane and drives the vehicle sits, is provided in the driver' s
cabin 21. The driver's sheet 25 allows the driver to drive the
vehicle and operate the crane while the driver faces the front
side in which the first frame 10 is provided. In the illustration,
a handle 26 to steer the vehicle and an operation rod 27 to operate
the crane are provided, as operation parts, in the front side
of the driver's cabin 21. Here, for running on the highway at
a high speed, the crane vehicle 1 may run in a state in which
the second frame 20 is placed in the front side. This is enabled
by placing the driver' s sheet 25 and the handle 26 in the reverse
direction (not shown).
[0030]
The first frame 10 and the second frame 20 are connected
to be able to bend relative to one another. To be more specific,
at an upper connection point, the rear end of the rear gradient
part 9 of the first frame 10 is connected to the installation
frame (not shown) to be able to rotate around a rotation center
34 via a pin extending vertically (not shown). Meanwhile, at
a lower connection point, the rear end of the lower frame 10a
of the first frame 10 is connected to the lower surface of the
bottom frame 20b to be able to rotate around the rotation center
34 via a pin extending vertically (not shown).
[0031]
Right and left hydraulic cylinders (not shown) are
provided between the first frame 10 and the second frame 20.
These right and left hydraulic cylinders are operated when the
driver steers the handle 26, so that the first frame 10 bends
right and left with respect to the second frame 20. Meanwhile,
the handle 26 may be used as a steering lever as long as it allows
the driver to steer the crane vehicle 1.
[0032]
With the present embodiment, in a case in which the crane
vehicle 1 suspends goods from the boom 11 while stopping, or
in a case in which the crane vehicle 1 runs while suspending
goods from the boom 11, the eight wheels, in total of the first
axles 13 and the second axle 14 bear most of the weight to be
loaded on the first axle 13 and the second axle 14 provided in
the first frame 10, and also the weight of the goods suspended
from the hook 7, among the total weight of the crane vehicle
1.
[0033]
Consequently, the first frame 10 has the increased number
of wheels by increasing the number of axles to two, so that it
is possible to improve the bearing capability to retain the
posture of the crane vehicle 1. This allows the entire crane
vehicle to be increased in size, and therefore it is possible
to increase the weight of goods to be suspended.
[0034]
Each of the right and left sides of the first frame 10
are supported by four wheels, and therefore it is possible to
improve the lateral stability not only in suspending goods but
also in running. Therefore, in the corners such as right turn
and left turn, it is possible to improve the lateral stability.
[0035]
The lower end of the derrick cylinder 17 and the lower
end of the inclined part 10b are fixed to the center of the
distance between the first axle 13 and the second axle 14 in
the longitudinal direction. Therefore, the load distribution
on the eight wheels in total of the first axle 13 and the second
axle 14 is approximately uniform.
[0036]
(Embodiment 2)
Fig. 4 and Fig. 5 show Embodiment 2 of the present
invention.
[0037]
Next, a layout of the wheels 3 and 4 with respect to the
first axle 13 and the second axle 14 will be explained with
reference to Fig. 4, which is a schematic plan view of Embodiment
2. As shown in Fig. 4, one wheel is provided on each of the
right and left ends of the first axle 13", meanwhile two wheels
are provided on each of the right and left ends of the second
axle 14. That is, the six wheels in total bear, the weight to
be loaded on the first axle 13 and the second axle 14 and also
the weight of the goods suspended from the hook 7, among the
total weight of the crane vehicle 1.
[0038]
As shown in Fig. 4, with Embodiment 2, the first axle 13
bears the weight by two wheels in total, meanwhile the second
axle 14 bears the weight by four wheels in total. Here, the
position of one wheel disposed on each of the right and left
of the first axle 13 is the same as the position of each of the
right and left outer wheels of the second axle 14.
[0039]
As shown in Fig. 5, which is a schematic side view, the
position to which the lower end of the derrick cylinder 17 and
the lower end of the inclined part 10b are fixed, is apart from
the first axle 13 by 2/3 of the distance (M in the figure) between
the first axle 13 and the second axle 14.
[0040]
By this means, also with Embodiment 2, the first frame
10 has the increased number of wheels by increasing the number
of axles to two, so that it is possible to improve the bearing
capability to retain the posture of the crane vehicle 1. The
right and left ends of the axles are supported by three wheels,
respectively, so that it is possible to improve the lateral
stability not only in suspending goods but also in running.
[0041]
As shown in Fig. 5, the position to which the lower end
of the derrick cylinder 17 and the lower end of the inclined
part 10b are fixed, is apart from the first axle 13 by 2/3 of
the distance (M in the figure) between the first axle 13 and
the second axle 14. By this means, the load distribution on
the six wheels in total of the first axle 13 and the second axle
14 is approximately uniform. Here, in practice, taking into
account of the convenience of the design, for example, the angle
of the inclined part 10b, the angle for attaching the derrick
cylinder 17 and the output of the derrick cylinder 17, the
position to which the lower ends of the derrick cylinder 17 and
the inclined part 10b are fixed, may be shifted to a certain
degree.
[0042]
As described above, with the present invention, the first
frame 10 including the boom 11 has two axles. This improves
the bearing capability to retain the posture of the crane vehicle
1, and therefore it is possible to increase the entire crane
vehicle in size, and consequently increase the weight of goods
to be suspended. By providing a plurality of axles, it is
possible to increase the total weight of the vehicle and also
increase the stability moment, and therefore increase the length
of the boom. By using a plurality of axles, there is no need
to use high-performance wheels having a high bearing capability
to retain the posture of the crane vehicle 1, so that it is
possible to minimize the cost.
[0043]
Although the embodiments of the present invention have
been described in detail with reference to the drawings, the
concrete configurations are not limited to these embodiment,
it will be appreciated that various modifications and
alterations of the design and so forth are possible without
departing from the scope of the invention. For example, the
first frame 10 may have three or more axles . This can be realized
by fixing the lower end of the derrick cylinder 17 and the lower
end of the inclined part 10b to the position that allows the
load distribution on many wheels provided on three or more axles
to be uniform.
Claims
1. A crane vehicle comprising:
a first frame having an upper part in which a boom that
can be derricked is provided, and a lower part in which an axle
and wheels are provided to allow the crane vehicle to run, the
wheels being provided on right and left sides of the axle; and
a second frame having an upper part in which a driver's
cabin is provided, and a lower part in which an axle and wheels
are provided to allow the crane vehicle to run, the second frame
being connected to the first frame to be able to bend right and
left with respect to the first frame, via a pin as a rotation
axis which extends in a vertical direction,
wherein the first frame includes:
an inclined part that inclines downward from a base end
of the boom from which the boom is derricked; and
a plurality of axles provided below the inclined part in
a longitudinal direction.
2 . The crane vehicle according to claim 1, wherein two wheels
are provided on each ends of at least a rear axle of the plurality
of axles.
3. The crane vehicle according to claim 2, wherein:
the first frame includes a derrick cylinder that has an
upper part connected to the boom and derricks the boom;
the first frame has two axles;
the two wheels are provided on each end of a front axle;
and
a lower end of the derrick cylinder and a lower end of
the inclined part are fixed to a center between the two axles
in the longitudinal direction.-
4. The crane vehicle according to claim 2, wherein:
one wheel is provided on each end of an axle other than
the rear axle of the plurality of axles; and
right and left wheels of the axle other than the rear axle
are provided on same positions as positions of respective outer
wheels provided on the rear axle.
5. The crane vehicle according to claim 4, wherein:
the first frame includes a derrick cylinder that has an
upper part connected to the boom and derricks the boom;
the first frame has two axles; and
a lower end of the derrick cylinder and a lower end of
the inclined part are fixed to a position that allows a load
distribution on each wheel of the two axles to be uniform.

ABSTRACT

a crane vehicle includes: a first frame having an upper
part in which a boom that can be derricked is provided, and a
lower part in which an axle and wheels are provided to allow
the crane vehicle to run, the wheels being provided on. right
and left sides of the axle; and a second frame having an upper
part in which a driver's cabin is provided, and a lower part
in which an axle and wheels are provided to allow the crane vehicle
to run, the second frame being connected to the first frame to
be able to bend right and left with respect to the first frame,
via a pin as a rotation axis which extends in a vertical direction.
The first frame includes : an inclined part that inclines downward
from a base end of the boom from which the boom is derricked;
and a plurality of axles provided below the inclined part in
a longitudinal direction.