JPS6237182B2 - - 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 transportation is not economical because it requires a truck vehicle with a longer loading floor than the vehicle itself.

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 difficult to perform various types of work using buckets and the like using highly versatile shovel-type excavators.

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. It is possible to improve the stability of the vehicle body while driving, and in addition, compared to conventional work arm devices, the arm can be freely changed from folding and storing to the vehicle body side to movement displacement during work. To provide a hydraulic excavator capable of exhibiting a working ability comparable to that of a dedicated vehicle even when the machine is mutually replaced with a bucket for bucket hoe work and a bucket for front loader work.

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

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

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

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 portion of the base boom 12 is connected to the base boom 12 by a pin member 29, and the rod 22 of the second drive jack 20 is connected to the 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 undulation cylinder 21 is connected to this mounting bracket 28 by a pin member 30, and the rod 31 of the undulation cylinder 21 is connected to the rear end of the arm 14 by a pin member 32. There is.

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, a locus circle S whose radius is the straight-line distance R between the center P of the vehicle body B and the front outer end Q of the driver's cab 40 is created.
The working arm device 1 is arranged so that the working arm device 11 is housed in the
1, the storage section 44, and the mounting structure 43 are arranged in consideration.

Next, the operation will be explained.

The first drive jack 19 of the inverted drive link mechanism 17 functions to hold the lever 18 from swinging;
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 is carried out by transporting the arm 14 articulated at the tip in the longitudinal and up-down directions of the vehicle body B, and by transporting the arm 14 toward the rear of the vehicle body B and retracting the arm 14 using the luffing cylinder 21. By folding to the base boom 12 side, the third
As shown in the figure, it is stored in the storage section 44 of the vehicle main body B and accommodated within the above-mentioned locus circle S.

Furthermore, by transporting and displacing the arm 14 to the front of the vehicle body B and moving it in the vertical direction and the movement of the base boom 12, 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. 6 and 7.
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.

4 and 5 show an example of application when a front loading bucket is attached, and as shown in FIG. 4, when the base boom 12 is tilted backward and the arm 14 is folded and stored,
1, there is no instability in the position of the center of gravity of the vehicle, and by operating the working arm device 11 as shown in FIG. 5, it is possible to perform tasks such as scooping and loading materials, and one vehicle can be used for general purposes.

The present invention has been described in detail above, and the base frame 12 is provided on the revolving frame 10 so as to be able to rise and fall, and the arm 14 having a bucket at the tip is provided on the base arm 12 so as to be tiltable, and the base boom 1
2 is provided with a luffing cylinder 21 for raising and lowering the arm 14, a lever 18 is swingably provided on the revolving frame 10, and one end of the lever 18 and the base boom 12 are swingable relative to each other by a second drive jack 20. Since the other end of the lever 18 is swingably connected to the end of the first drive jack 19 that is swingably provided on the swing frame 10, most of the working arm device can be folded toward the vehicle body. The base boom can be folded and stored in the vehicle body, making it possible to further shorten the overall length and height of the vehicle, thereby improving vehicle stability while driving. This bucket work machine is equipped with an arm that can be moved in the longitudinal and up-down directions of the vehicle body, and can be freely changed from folding and storing on the vehicle body side to movement displacement during work, compared to conventional work arm devices. Buckho work bucket,
Even if it is mutually replaced with a front loader work bucket, it can demonstrate work performance comparable to that of a dedicated vehicle.

[Brief explanation of the drawing]

Fig. 1 is a side view showing a state in which the working arm device is retracted 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 is a side view showing the working arm device in an operating state. FIG. 4 is a side view showing the working arm device in a retracted state in another embodiment of the present invention, FIG. 5 is a side view showing the operating state of the working arm device, FIG. FIG. 7 is a side view showing another aspect of the inverted drive link mechanism. 10 is a rotating frame, 12 is a base boom, 1
4 is an arm, 18 is a lever, 19 is a first drive jack, 20 is a second drive jack, 21 is an elevating cylinder, and 34 is an arm cylinder.

Claims (1)

[Claims] 1. A base frame 12 is provided on the revolving frame 10 so that it can be raised and lowered, and an arm 14 with a bucket at the tip is provided on the base arm 12 so that it can be tilted.
The base boom 12 is provided with a hoisting cylinder 21 that performs the hoisting operation of the arm 14, the swing frame 10 is provided with a lever 18 swingably, and one end of the lever 18 and the base boom 12 are connected to a second drive jack 20.
lever 18.
A hydraulic excavator characterized in that an end portion of a first drive jack 19 swingably provided on the revolving frame 10 is swingably connected to the other end side.