JP4226833B2 - Rough terrain crane body frame - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a body frame of a rough terrain crane.
[0002]
[Prior art]
The body frame of the rough terrain crane is composed of front, middle, and rear frames 1, 2, and 3, as shown in FIG.
[0003]
A swivel base 5 is slidably mounted on the intermediate frame 2 via a swivel bearing 4. A driver's cab 6 for traveling and crane operation is attached to the swivel base 5 and a telescopic boom 7 is pivotally mounted so as to be able to rise and fall. A wire rope fed from a winch device 18 disposed at the rear of the swivel base 5 is suspended from the distal end of the telescopic boom 7, and a crane work is performed by hanging a load on the wire rope.
[0004]
A front outrigger outer box 8 is disposed in front of the front frame lower surface 1L, and a rear outrigger outer box 9 is disposed behind the rear frame lower surface 3L. An outrigger inner box (not shown) is fitted in the outer boxes 8 and 9, and the outrigger inner box projects to the side of the vehicle body frame, and supports the entire rough terrain crane by a jack at the end (not shown). ing.
[0005]
FIG. 7 schematically illustrates an external force acting on the vehicle body frame of the rough terrain crane shown in FIG. A vertical force FZ is applied to the intermediate frame 2 in the vertical direction (Z direction) from the swivel 5 and a bending moment MX is applied in the longitudinal direction of the vehicle body frame (around the X axis). Torsional moment MY acts around. The vertical force FZ, the bending moment MX, and the torsional moment MY vary depending on the turning angle of the turntable 5, the length and angle of the telescopic boom, and the weight of the suspended load.
[0006]
As shown in FIG. 7, the body frame can be viewed as a both-end support beam that receives a concentrated load at the center thereof, and stress is generated in the cross sections of the front frame 1, the intermediate frame 2 and the rear frame 3 by the above external force. However, deformation occurs in the entire body frame.
[0007]
[Problems to be solved by the invention]
As a necessary characteristic of the vehicle body frame, the above-mentioned stress is made to be a predetermined value or less, that is, to ensure the strength, but it is important to suppress the deformation of the entire vehicle body frame from the viewpoint of improving crane operability. It has become. In order to suppress deformation of the body frame, it is effective to increase the rigidity of the frame without increasing the overall weight and to reduce deformation, both in bending and in torsion. Means.
[0008]
FIG. 5 is a cross-sectional view taken along arrow A in FIG. 4 and shows a mounting portion of the front axle 10 of the front frame 1. The left and right width directions of the front frame 1 are regulated by the front tire 11 and the front suspension device 12, and there is no room for further increasing the dimensions. Further, the front frame lower surface 1 </ b> L cannot be positioned further downward due to the relationship with the front axle 10. Accordingly, the cross section of the front frame 1 can be enlarged only by positioning the front frame upper surface 1U further upward.
[0009]
FIG. 6 is a cross-sectional view taken along arrow B in FIG. 4 and shows a mounting portion of the rear axle 13 of the rear frame 3. The cross section of the rear frame 3 is separated to the right and left because of the relationship in which the engine 16 is disposed in the center. In order to enlarge the cross section of the rear frame 3 as a whole, the left and right width directions are regulated by the rear tire 14 and the rear suspension device 15, and there is no room for further increasing the dimensions. Further, the rear frame lower surface 3L cannot be positioned further below the relationship with the rear axle 13. Therefore, the cross section of the rear frame 3 can be enlarged only by positioning the rear frame upper surface 3U further upward.
[0010]
Positioning the upper surface 2U of the intermediate frame 2 shown in FIG. 4 further upward increases the position of the swivel base 5, the telescopic boom 7, etc. and raises the center of gravity of the entire rough terrain crane. The stability required for the determined rough terrain crane cannot be ensured, and there is a possibility that the vehicle will not be realized on a public road.
[0011]
On the other hand, the transmission 17 projects downward from the lower surface 2L of the intermediate frame, and the minimum ground height H2 as a vehicle is determined by the transmission 17. The ground height H1 of the front outrigger outer box 8 and the ground height H3 of the rear outrigger 9 are substantially the same as the minimum ground height H2.
[0012]
Here, the minimum ground height of the raft lane crane is determined in consideration of traveling performance in rough areas, but the portion of the raft lane crane where the height is determined is the ground. Therefore, a portion having a strength that does not cause deformation or the like with some interference is desirable.
[0013]
From this point of view, since the frame structure of the raft lane crane has strength, there is no problem with the interference with the ground projections even if the position of the intermediate frame lower surface 2L is lowered to the minimum ground height H2. By doing so, the cross section of the intermediate frame 2 can be made larger than before. Even in such a case, it is necessary to be able to connect the hydraulic / pneumatic equipment arranged on the side portion of the intermediate frame and the hydraulic / pneumatic equipment arranged on the inner side by hydraulic / pneumatic piping without any trouble.
[0014]
Therefore, the present invention provides a vehicle body of a rough terrain crane that can increase the rigidity of the front frame 1, the rear frame 3, and the intermediate frame 2 as much as possible to increase the rigidity and easily perform hydraulic / pneumatic piping. Try to provide a frame.
[0015]
[Means for Solving the Problems]
The body frame of the rough terrain crane described in claim 1 of the present application is provided with a front frame to which a front axle is attached in front of an intermediate frame on which a swivel is mounted, and a rear frame to which a rear axle is attached behind. The upper surface of the intermediate frame is formed lower than the upper surfaces of the front frame and the rear frame, the lower surface of the intermediate frame is formed lower than the lower surfaces of the front frame and the rear frame, and the front lower surface of the front frame A front outrigger outer box, a rear outrigger outer box is arranged behind the rear lower surface of the rear frame, and the lower surface of the intermediate frame, the lower surface of the front outrigger outer box, and the lower surface of the rear outrigger outer box are at the lowest ground of the rough terrain crane. and configured to be substantially the same height becomes high, and a box-type structure, wherein comprising the intermediate frame from the upper and lower plates and the side plates, The height direction intermediate portion of the side plate characterized by comprising a pipe hole for fitting the pipe-like member for the passage of the oil air pipe for communicating the intermediate frame side portion and the inner portion.
[0016]
By configuring the vehicle body frame as described above, the front frame and the rear frame can be made larger in cross section than the conventional frame, and the intermediate frame can have its upper surface positioned higher than the conventional frame. The cross section can be enlarged. As a result, the rigidity against bending and torsion acting on the body frame can be increased, and the deformation of the body frame during crane work can be reduced. Furthermore, the hydraulic / pneumatic equipment arranged on the side of the intermediate frame and the hydraulic / pneumatic equipment arranged on the inner side of the intermediate frame can be easily communicated with each other by piping.
[0017]
Further, in the body frame of the rough terrain crane described in claim 2 of the present application, the outrigger is an X-type outrigger, and the lower surface of the intermediate frame in a state in which the X-type outrigger is stored, the front outrigger outer box The lower surface and the lower surface of the rear outrigger outer box are configured to have substantially the same height.
[0018]
With this configuration, not only the H-type outrigger but also the rough terrain crane using the X-type outrigger can increase the rigidity of the body frame and reduce the deformation of the body frame during crane operation.
[0019 ]
[ 0020 ]
[ 0021]
DETAILED DESCRIPTION OF THE INVENTION
FIG. 1 shows a body frame 20 of a rough terrain crane according to an embodiment of the present invention. FIG. 2 is a view as seen from the direction of arrow D in FIG. 1 and shows the vehicle body frame 20 as viewed from above.
[0022]
The body frame 20 includes a front frame 21, an intermediate frame 22, and a rear frame 23.
[0023]
A swivel base 25 is turnably mounted on the intermediate frame 22 via a swivel bearing 24, and a cab 26 for traveling and crane operation is attached to the swivel base 25, and a telescopic boom 27 is raised and lowered. It is pivotally possible. A front axle 30 is disposed below the front frame 21, and a rear axle 33 is disposed below the rear frame 33.
[0024]
A front outrigger outer box 28 is fixed to the front of the lower surface of the front frame 21, and a rear outrigger outer box 29 is fixed to the rear of the lower surface of the rear frame 23. An outrigger inner box (not shown) is fitted in the outer boxes 28 and 29, the outrigger inner box is projected to the side of the vehicle body frame, and the entire rough terrain crane is supported by a jack (not shown) provided at the front end of the outrigger inner box. Has come to support. The outrigger equipped in the body frame 20 according to the present embodiment is called an H-type outrigger.
[0025]
As shown in FIG. 1, the intermediate frame upper surface 22U is formed lower than the front frame upper surface 21U and the rear frame upper surface 23U. The intermediate frame lower surface 22L is formed lower than the front frame lower surface 21L and the rear frame lower surface 23L.
[0026]
Furthermore, the ground height H5 of the lower surface 22L of the intermediate frame, the ground height H4 of the lower surface 28L of the front outrigger outer box, and the ground height H6 of the lower surface 29L of the rear outrigger outer box are substantially the same. The intermediate frame lower surface height H5, the front outrigger outer box lower surface height H4, and the rear outrigger outer case lower surface height H6 are the minimum ground height of the rough terrain crane.
[0027]
With the configuration of the vehicle body frame 20 described above, it is possible to secure a side surface height sufficient to ensure sufficient rigidity of the vehicle body frame. In particular, in the intermediate frame 22 portion, the height of the intermediate frame upper surface 22U is equal to the height of the intermediate frame upper surface of the conventional frame, so that the position of the intermediate frame lower surface 22L can be increased without raising the center of gravity of the entire rough terrain crane. Can be positioned as low as possible. Therefore, the height of the intermediate frame 22 can be made significantly larger than that of the conventional vehicle body frame.
[0028]
As described above, the rigidity against the bending moment and torsional moment acting on the vehicle body frame 20 can be increased as compared with that of the conventional frame, and the deformation of the vehicle body frame 20 during the crane operation can be reduced. Further, since the rigidity of the vehicle body frame 20 is improved by increasing the cross-sectional height, the thickness of the plate material constituting the vehicle body frame cross-section can be reduced. Therefore, it is possible to increase the rigidity without increasing the weight of the body frame 20 as a whole.
[0029]
In addition, when the outrigger is an X-type outrigger, the lower surface of the intermediate frame, the lower surface of the front outrigger outer box, and the lower surface of the rear outrigger outer box in a state in which the X-type outrigger is stored may be configured to have substantially the same height. Also in this case, the rigidity against bending moment and torsional moment acting on the vehicle body frame can be increased more than that of the conventional frame, and deformation of the vehicle body frame during crane work can be reduced.
[0030]
Reference numerals 35 and 36 shown in FIG. 1 denote piping holes through which hydraulic / pneumatic piping is provided in the side plate 37 of the intermediate frame 22. FIG. 3 is a cross-sectional view taken along the arrow C in FIG. 1 and is a view for explaining the details of the hydraulic / pneumatic piping hole 35. The intermediate frame 22 forms a box-shaped structure with an upper plate 43 constituting the upper surface of the intermediate frame, a lower plate 44 constituting the lower surface of the intermediate frame, and left and right side plates 37. Hydraulic / pneumatic devices 40a,... Are arranged in the intermediate frame side portion 38 and the intermediate frame inner portion 39, and hydraulic / pneumatic piping 41a, 41b,. The pipe is piped through a pipe hole 35 provided in the side plate 37.
[0031]
Conventionally, the hydraulic / pneumatic piping connecting the side portion and the inner portion of the intermediate frame is connected via the lower side of the lower surface of the intermediate frame. However, as described above, the intermediate frame lower surface 22L of the present invention is a part that determines the minimum ground height, and the lower part cannot be used as a part for the hydraulic / pneumatic piping. However, as shown in FIG. 3, by providing the hole 35 for piping in the intermediate frame side plate 37, it becomes possible to make hydraulic / pneumatic piping without passing below the lower surface 22L of the intermediate frame. Further, as shown in FIG. 3, if the hydraulic / pneumatic pipes 41a, 41b,... Are provided via the pipe holes 35 provided in the intermediate frame side plate 37, the pipe itself can be piped at a shorter distance. Can be made compact and clean, and the piping work can be facilitated.
[0032]
The piping hole 35 is configured by fitting a pipe-like member 42 into the holes formed in the intermediate frame outer side plate 37a and the inner side plate 37b near the intermediate portion in the height direction of the intermediate frame 22. Accordingly, the position of the piping hole 35 is selected where the stress generated by the bending moment of the intermediate frame side plate is low, and the pipe-shaped member 42 plays a role as a reinforcing material. There is no risk of a decrease in strength of the intermediate frame 22 due to the above.
[0033]
【The invention's effect】
In the rough terrain crane body frame according to claim 1 of the present application, the upper surface of the intermediate frame is formed lower than the upper surfaces of the front and rear frames, and the lower surface of the intermediate frame is the lower surface of the front and rear frames. and forming lower than the lower surface of the intermediate frame, before the lower surface and the lower surface of the rear outrigger outer box outrigger outer box is configured to be substantially the same height as to be ground clearance of rough terrain crane, the intermediate frame upper plate Piping with a box-shaped structure consisting of a bottom plate and a side plate, and a pipe-like member inserted into the middle in the height direction of the side plate to pass hydraulic / pneumatic piping that connects the side and side of the intermediate frame since with the use holes for the front frame and the rear frame, than the conventional it can increase its cross-section, the intermediate frame the position of the upper surface Without higher than the years, it is possible to increase the cross-section. As a result, the rigidity against bending and torsion acting on the vehicle body frame can be increased, so that the deformation of the vehicle body frame during crane work is reduced, and the crane operability can be improved. Furthermore, the hydraulic / pneumatic equipment arranged on the side of the intermediate frame and the hydraulic / pneumatic equipment arranged on the inner side of the intermediate frame can be easily communicated with each other by piping.
[0034]
Further, in the body frame of the rough terrain crane described in claim 2 of the present application, the lower surface of the intermediate frame, the lower surface of the front outrigger outer box, and the lower surface of the rear outrigger outer box in the state in which the X-type outrigger is stored are substantially the same height. Since the rigidity of the body frame can be increased even in the rough terrain crane using the X-type outrigger, the deformation of the body frame during the crane operation is reduced, and the crane operability is improved. It can be done.
[0035]
[Brief description of the drawings]
FIG. 1 is a body frame of a rough terrain crane according to an embodiment of the present invention.
FIG. 2 is a view taken in the direction of arrow D in FIG.
3 is a cross-sectional view taken along arrow C in FIG.
FIG. 4 is a vehicle body frame of a conventional rough terrain crane.
5 is a cross-sectional view taken along arrow A in FIG.
6 is a cross-sectional view taken along arrow B in FIG.
FIG. 7 is a diagram schematically illustrating an external force acting on a vehicle body frame.
[Explanation of symbols]
20 body frame 21 front frame 22 intermediate frame 23 rear frame 25 swivel base 28 front outrigger outer box 29 rear outrigger outer box 30 front axle 33 rear axle 35, 36 piping hole 37 side plate 38 intermediate frame side 39 inside intermediate frame Side 41 Hydraulic / pneumatic piping 43 Upper plate 44 Lower plate

Claims (2)

A front frame to which a front axle is attached in front of an intermediate frame on which a swivel is mounted is provided, and a rear frame to which a rear axle is attached to the rear is provided.
Forming the upper surface of the intermediate frame lower than the upper surfaces of the front frame and the rear frame, and forming the lower surface of the intermediate frame lower than the lower surfaces of the front frame and the rear frame;
A front outrigger outer box is arranged in front of the front frame lower surface, a rear outrigger outer box is arranged in the rear of the rear frame lower surface, and the lower surface of the intermediate frame, the lower surface of the front outrigger outer box, and the lower surface of the rear outrigger outer box are The rough terrain crane is configured to have the same height as the lowest ground height ,
The intermediate frame has a box-type structure composed of an upper plate, a lower plate, and a side plate, and a hydraulic / pneumatic pipe that connects the side portion of the intermediate frame and the inner portion is passed through the intermediate portion in the height direction of the side plate. A vehicle body frame for a rough terrain crane, comprising a piping hole fitted with a pipe-like member . The outrigger is an X-type outrigger, and the lower surface of the intermediate frame, the lower surface of the front outrigger outer box, and the lower surface of the rear outrigger outer box in a state in which the X-type outrigger is stored are configured to have substantially the same height. The body frame of the rough terrain crane according to claim 1 .

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