JPS6261738B2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a hydraulic excavator.

In hydraulic excavators, the working arm device consisting of the boom, arm, etc. is usually moved to a position away from the vehicle body within a range that does not compromise the stability of the vehicle body, allowing a wide range of movement of the work machine. It is.

Therefore, the working arm devices such as the boom and arm protrude forward from the vehicle body, and even if the arm is bent around the joint point with the boom, the overall length of the vehicle including the working arm device is long, and the boom Even if the working arm device was swung around its pivot point with the vehicle body and the entire working arm device was folded into the vehicle body, the overall height of the vehicle in the vertical direction remained high.

The problem with the long overall length of the vehicle in the longitudinal direction, including the working arm device, is that it requires transportation using a truck vehicle with a longer loading floor than the vehicle itself, which is not economical.

Furthermore, there is an idea to fold the boom toward the vehicle body to shorten the overall length of the vehicle in the front-rear direction, but depending on the vehicle, the overall height may increase and exceed the height transportation limit.

Another problem with hydraulic excavators is that the use of the working arm device while the vehicle is running is dangerous from the standpoint of vehicle stability, which limits the workability. In particular, the working arm device that protrudes from the vehicle body lacks running stability of the vehicle and restricts running on slopes and at high speeds.

This makes it impossible to perform various types of work using buckets and the like using highly versatile excavators.

In addition, the working arm device is usually installed on a revolving body, and the working arm device can be moved in all directions around the vehicle body. In some cases, construction work could not be carried out.

The present invention has been made in view of the above circumstances, and its purpose is to allow most of the working arm device to be folded and stored in the vehicle body, thereby further shortening the overall length of the vehicle and reducing its overall height. An object of the present invention is to provide a hydraulic excavator which can improve vehicle body stability during running.

Another object of the present invention is to provide a hydraulic excavator whose working arm device can be accommodated within the maximum locus circle of the mounting structure, thereby making it possible to carry out work in narrow spaces.

Hereinafter, the present invention will be explained with reference to the drawings.

FIGS. 1 and 2 show a hydraulic excavator of the excavator type, and 10 is a revolving frame.

A working arm device 11 is installed on this rotating frame 10. This working arm device 11 includes a base boom 12, a second boom 13, and an arm 14, which are each articulated.

The base boom 12 has a pair of base brackets 15 provided on the swing frame 10 at its base end.
It is pivotally supported by a pin member 16, and is swung in the longitudinal direction of the vehicle body by an inverted drive link mechanism 17.

The inverted link mechanism 17 includes a pair of levers 18 pivoted on the same axis as a pin member 16 that pivots the base boom 12 to the base bracket 15, and a second drive jack 20 at the lower end of the lever 18. The base end portions of the two drive jacks 20 are connected to each other by a pin member 29, and the rod 22 of the second drive jack 20 is connected to the first base boom 12 by a pin member 23.

Further, a base end portion of the first drive jack 19 is connected to a mounting bracket 24 provided on the swing frame 10 by a pin member 25.
The rod 26 of 9 is connected to the upper end of the lever 18 by a pin member 27.

At the bottom of the base boom 12 is a mounting bracket 2.
8 is fixedly installed, and the base end of the second boom hoisting cylinder 21 is attached to the pin member 3 on this mounting bracket 28.
0, and the second boom hoisting cylinder 21
The rod 31 is connected to the rear end of the second boom 13 by a pin member 32.

Additionally, a mounting bracket 33 is attached to the second boom 13.
The base end of an arm cylinder 34 is connected to this mounting bracket 33 by a pin member 35, and the rod 36 of the arm cylinder 34 is connected to the rear end of the arm 14 by a pin member 37.

A bucket belt 38 is tiltably attached to the tip of the arm 14, and the bucket belt 38 is tilted by a bucket cylinder 39 provided on the arm 14 via a link lever mechanism 45.

The working arm device 11 configured in this manner is located on the center line C of the vehicle body B, and on the left and right sides of the working arm device 11 are a driver's cab 40 mounted on the revolving frame 10, tanks, etc. 41, an engine, hydraulic equipment, and weights 42 are arranged, and these mounting structures 43 form a storage section 44 in the center of the vehicle body B in which the working arm device 11 is stored.

When the working arm device 11 is stored in the storage section 44, the turning center P of the vehicle body B and the driver's cab 4 are connected to each other.
The arrangement of the working arm device 11, the storage section 44, and the mounting structure 43 is taken into consideration so that the working arm device 11 fits within a locus circle S whose radius is a straight-line distance R from the front outer end Q of the working arm device 11.

Next, the operation will be explained.

The first drive jack 19 of the inverted drive link mechanism 17 swings and holds the lever 18;
The second drive jack 20 swings and holds the base boom 12.

That is, when the base boom 12 is held by the second drive jack 20 and the lever 18 is swung by the first drive jack 19, the base boom 12 is inverted via the second drive jack 20. Also, the first
Even if the lever 18 is fixed by holding the drive jack 19 and the second drive jack 20 is operated, the base boom 12 moves in an inverted motion.

The operation of the first drive jack 19 moves the base boom 12 upside down within the range on the right side in FIG. 2, and the operation of the second drive jack 20 moves the base boom 12 within the range on the left side in FIG. Do a handstand exercise.

Such movement of the base boom 12 causes the second boom 13 articulated at the tip to be transported in the longitudinal and up-down directions of the vehicle body B, and the rearward transport displacement of the vehicle body B causes the retreat of the second boom 13 to be carried out in the second direction. By folding it toward the base boom 12 using the boom hoisting cylinder 21, it is stored in the storage section 44 of the vehicle main body B, as shown in FIG. 3, and accommodated within the above-mentioned locus circle S.

Furthermore, by transporting and displacing the second boom 13 to the front of the vehicle body B and moving it in the vertical direction and the movement of the arm 14, a backhoe operation is performed as shown in FIG.

By doing so, the overall length and height of the vehicle can be made compact, and running stability can be obtained by moving the working arm device 11 toward the center of gravity of the vehicle.

The inverted drive link mechanism 17 is shown in FIGS. 7 and 8.
shows another embodiment of.

These inverted drive link mechanisms 17 connect the base arm 12 and lever 18 to separate mounting brackets 47 and 48 protruding from the revolving frame 10 using pin members 45 and 46, respectively. The fulcrum is shifted back and forth.

Figures 4 to 6 show an example of application when a front loading bucket is installed.As shown in Figure 4, when the base boom 12 is pushed backwards and the second boom 13 is folded and stored, the working arm There is no instability in the position of the center of gravity of the vehicle due to the device 11.
By operating the working arm device 11 as shown in FIGS. 6 and 6, it is possible to perform tasks such as scooping and loading materials, and one vehicle can be used for general purposes. Further, as shown in FIG. 9, a counterweight 50 is swingably provided on the revolving frame 10, a lever 51 is pivotally supported on the extension line of the axis of the pin 25, and one end of this lever 51 is connected to the counterweight 50 via a link 52. The other end of the lever 51 may be connected to a link 53 pivoted on the extension of the axis of the pin 23, and the counterweight 50 may be raised or lowered by rotation of the base boom 12.

The present invention has been described in detail above, and the base boom 12 is provided on the revolving frame 10 so that it can be raised and lowered, and the second boom 13 is provided on the base boom 12 so that it can be raised and lowered, and the second boom 13 has a bucket 38 at its tip.
The base boom 12 is provided with a second boom hoisting cylinder 21 for hoisting the second boom 13, and the second boom 13 is provided with an arm cylinder 34 for hoisting the arm 14. , lever 1 on the rotating frame 10
8 is swingably provided, one end side of the lever 18 and the base boom 12 are swingably connected to each other by a second drive jack 20, and the other end side of the lever 18 is swingably connected to the swing frame 10. The first established
The working arm device 11 is constructed by connecting the ends of the drive jack 19 so as to be swingable, and the mounting structure 43 on the rotating frame 10 forms the storage section 44 in which the working arm device 11 is stored when folded. Most of the device can be folded and stored on the vehicle body side, making it possible to further shorten the overall length of the vehicle and its overall height, thereby improving the stability of the vehicle body during driving.

Moreover, in the present invention, the working arm device 11 is arranged to fit within the maximum locus circle S centered on the rotation center Q of the mounting structure 43 when stored in the storage section 44, so that the working arm device 11 is not attached to the mounting structure. This allows the work to be carried out within the maximum trajectory circle of , making it possible to perform work in narrow spaces.

[Brief explanation of the drawing]

Fig. 1 is a side view showing the working arm device in a retracted state according to an embodiment of the present invention, Fig. 2 is a side view showing the operating state of the working arm device, and Fig. 3 shows the vehicle mounting structure and the working arm device. FIG. 4 is a side view showing the working arm device in a retracted state in another embodiment of the present invention; FIGS. 5 and 6 are side views showing the operating state of the working arm device; FIG. 7 and FIG. 8 are side views showing other aspects of the inverted drive link mechanism, and FIG.
The figure is a side view of another embodiment of the invention. 10 is a rotating frame, 11 is a working arm device, 12
1 is a base boom, 13 is a second boom, 14 is an arm, 18 is a lever, 19 is a first drive jack, 2
0 is a second drive jack, 21 is a second boom hoisting cylinder, 34 is an arm cylinder, 44 is a storage section,
S is the maximum trajectory circle.

Claims (1)

[Claims] 1. A base boom 12 is provided on the revolving frame 10 so that it can be raised and lowered, and a second boom 13 is provided on the base boom 12 so that it can be raised and lowered, and the second boom 13 is provided with an arm 14 having a bucket 38 at its tip. The base boom 12 is provided with a second boom hoisting cylinder 21 for hoisting the second boom 13, and the second boom 13 is provided with an arm cylinder 34 for hoisting the arm 14. 18 is swingably provided, and the lever 18
An end portion of a first drive jack 19 whose one end side and the base boom 12 are swingably connected to each other by a second drive jack 20, and the other end side of a lever 18 is swingably provided to the swing frame 10. A hydraulic excavator is characterized in that a working arm device 11 is constructed by swingably connecting the working arm device 11, and a storage section 44 is formed in the rotating frame 10 in which the working arm device 11 is stored in a mounting structure 43 when folded. 2. The base boom 12 is provided on the revolving frame 10 so that it can be raised and lowered, and the second boom 13 is provided on the base boom 12 so that it can be raised and lowered, and the arm 14 with a bucket 38 at the tip is provided on the second boom 13 so that it can be raised and lowered. The boom 12 is provided with a second boom hoisting cylinder 21 for raising and lowering the second boom 13, and the second boom 13 is provided with an arm cylinder 34 for raising and lowering the arm 14, so that the lever 18 can be pivoted on the revolving frame 10. Provided, lever 1
8 and the base boom 12 are swingably connected to each other by a second drive jack 20, and the other end of the lever 18 is swingably provided on the swing frame 10. The working arm device 11 is configured by swingably connecting the working arm device 11, and a mounting structure 43 on the rotating frame 10 forms a storage section 44 in which the working arm device 11 is stored when folded. When the working arm device 11 is stored in the rotation center Q of the mounting structure 43,
A hydraulic excavator characterized by being configured to fit within a maximum locus circle S centered at .