JPH09111805A - Mounted structure of hydraulic cylinder for blade for use in construction machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To eliminate the necessity of guard members for a hydraulic cylinder which causes a blade to oscillate up and down and for piping so as to achieve cost reduction by providing the hydraulic cylinder inside a car body. SOLUTION: A hydraulic cylinder 17 which causes a blade 16 to oscillate up and down has its piston rod 17 a journalled to the upper side of the first end of a support arm 15 in such a way as to freely oscillate. The first end of a hydraulic cylinder barrel 17b is journalled, in such a way as to freely oscillate, to a mounting bracket 18 secured to the inner periphery of a cylindrical frame. Piping 19 for supplying pressure oil to the hydraulic cylinder 17 is connected via a rotary joint to a pressure oil feeding source provided in a revolving upper structure. Thus the piston rod 18a can be journalled to the upper part of the first end of the support arm 15 through the space between the upper and lower cross frames 12 of the piston rod 17a in such a way as to freely oscillate, so the hydraulic cylinder 17 can be almost entirely mounted inside a car body 9. Therefore the need for protective guards is eliminated and the number of part items can be reduced, leading to cost and weight reduction.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention belongs to the technical field of construction machines such as hydraulic excavators used for various construction works, works such as civil works.

[0002]

2. Description of the Related Art Generally, some construction machines of this type have blades attached to a car body of an undercarriage in which an upper revolving structure is rotatably supported so that a blade operation can be performed. As such, conventionally, as shown in FIG. 7, the support bracket 14 is fixed so as to protrude from the tip of the car body 9, and the support bracket 14 has a blade 16 attached to the tip thereof. The base end portion of the arm 15 and the base end portion of the hydraulic cylinder 17 whose front end portion is connected to the intermediate portion of the support arm 15 are swingably connected to each other, and the blade 16 is extended based on the expansion and contraction operation of the hydraulic cylinder 17. It was designed to perform vertical swing motion.

[0003]

However, in the above-mentioned conventional one, since the hydraulic cylinder 17 is interposed between the support bracket 14 and the support arm 15, not only the entire hydraulic cylinder 17 but Pipe 1 for supplying pressure oil
9 is exposed to the outside. Therefore, in order to protect the hydraulic cylinder 17 and the pipe 19, a guard member 20 needs to be additionally provided, and the long pipe 19 is complicatedly bent so as not to interfere with other members. Therefore, there is a problem to be solved by the present invention.

[0004]

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances in order to solve these problems, and a lower traveling mode in which an upper revolving structure is rotatably supported is provided. In a construction machine in which a base end portion of a support arm is swingably attached to a car body of a body, and a blade is attached to a tip end portion of the support arm, a support arm and a car body side are provided to swing the blade up and down. When installing the hydraulic cylinder between the
It is the interior of the car body. This makes it possible to effectively protect the hydraulic cylinder and the pipe for supplying pressure oil to the hydraulic cylinder without providing a separate guard member. In this case, when the car body has a cylindrical frame having a flange portion to which the turning circle is attached on the upper surface, the cylinder tubular portion of the hydraulic cylinder can be internally supported on the inner peripheral side of the cylindrical frame. . In addition, when the car body is configured by using a cylindrical frame having a flange portion to which a turning circle is attached on the upper surface and an upper and lower cross frames that connect the cylindrical frame and the track frame, a cylinder of a hydraulic cylinder is used. The tubular portion can be internally supported in the inner circumferential side or the left and right outer spaces of the cylindrical frame while being positioned between the upper and lower cross frames. Furthermore, a cylinder attachment portion to which a tip portion of a hydraulic cylinder is attached can be integrally formed with a base end portion of the support arm attached to the car body. By doing so, the number of parts can be reduced. .

[0005]

Next, an embodiment of the present invention will be described with reference to the drawings. In the drawings, reference numeral 1 is a hydraulic excavator, and the hydraulic excavator 1 includes a crawler type lower traveling body 2, an upper swinging body 3 swingably supported above the lower traveling body 2, and an upper swinging body 3. As in the prior art, the front attachment 4 and the like attached to the front portion are configured.

The base frame of the lower traveling body 2 includes a front idler 5, a drive sprocket 6, and a traveling roller 7.
It is composed of left and right track frames 8 to which various traveling devices such as are mounted, a car body 9 that supports the upper swing body 3, and the like, and the car body 9 further includes a flange portion 11a to which a swing circle 10 is mounted. A cylindrical frame 11 provided on the upper surface, and upper and lower cross frames 1 connecting the cylindrical frame 11 and the track frame 8
2. The support frame 13 is supported between the upper and lower cross frames 12 and is oriented in the vertical direction.

On the other hand, 14 is the upper and lower cross frames 1
2 is a left and right support bracket integrally fixed to the front end portion of the second support arm 14. The base end portions of the left and right support arms 15 facing the front-rear direction are connected to the support bracket 14 so as to be vertically swingable. Further, a blade 16 oriented in the left-right direction is integrally attached to the tip of the support arm 15. Further, the support arm 15 has a shape in which a base end side portion connected to the support bracket 14 bulges upward, and the left and right hydraulic cylinders 17 described later are described.
Each of the piston rods 17a has a tip end portion attached thereto.

The hydraulic cylinder 17 expands and contracts to swing the blade 16 up and down, and the base end portion of the cylinder barrel 17b is fixedly mounted on the inner peripheral side of the cylindrical frame 11. The bracket 18 is swingably supported. The piston rod 17a of the hydraulic cylinder 17 is swingably supported by the upper part of the base end side of the support arm 15 so as to pass through between the upper and lower cross frames 12, so that substantially the entire hydraulic cylinder 17 can be rotated. It is installed inside the body 9, that is, in the space sandwiched between the inner peripheral side of the cylindrical frame 11 and the upper and lower cross frames 12. Reference numeral 19 is a pipe connected to the cylinder cylinder 17b to supply pressure oil to the hydraulic cylinder 17,
The rotary joint 21 is provided on the pressure oil supply source side provided on the upper swing body 3.
Are connected via

In the structure constructed as described above, the vertical swing of the blade 16 is performed based on the expansion and contraction operation of the hydraulic cylinder 17, which is substantially entirely inside the car body 9, that is, the cylinder. It is installed in a space sandwiched between the inner peripheral side of the frame 11 and the upper and lower cross frames 12. As a result, the hydraulic cylinder 17 and the pipe 19 connected to the hydraulic cylinder 17 can be effectively protected from the earth and sand scattered during the work,
Unlike the conventional hydraulic cylinder that is exposed to the outside, it is not necessary to separately provide a guard member for protection, which contributes to cost reduction and weight reduction. Moreover, there is an advantage that it is not necessary to route the pipe to the outside unlike the conventional one, and the work of attaching the pipe 19 can be easily performed, and the appearance is neat. Moreover, in the present embodiment, the base end portion of the support arm 15 is integrally formed with a portion to which the tip end portion of the piston rod 17a of the hydraulic cylinder 17 is attached, so that a separate bracket for attaching the piston rod is not required. Can contribute to the reduction of the number of parts.

Of course, the present invention is not limited to the above-described embodiment, and one hydraulic cylinder 17 may be provided as in the second embodiment shown in FIG. 5. In this case,
The left and right support brackets 15 may be connected by the connecting rod 22, and the tip end portion of the hydraulic cylinder 17 may be pivotally supported by the intermediate portion of the connecting rod 22. Further, as in the third embodiment shown in FIG. 6, the cylinder cylinder 17b of the hydraulic cylinder 17 can be installed inside the space between the upper and lower cross frames 11 located on the left and right outside of the cylindrical frame 11.

[Brief description of the drawings]

FIG. 1 is a side view of a hydraulic excavator.

FIG. 2 is a perspective view of a base frame.

FIG. 3 is a plan view of a car body portion.

FIG. 4 is a side view showing a mounting portion of a hydraulic cylinder.

FIG. 5 is a plan view of a car body portion showing a second embodiment.

FIG. 6 is a plan view of a car body portion showing a third embodiment.

FIG. 7 is a side view showing a mounting portion of a conventional hydraulic cylinder.

[Explanation of symbols]

 2 Upper revolving structure 3 Lower traveling structure 8 Track frame 9 Car body 10 Revolving circle 11 Cylindrical frame 11a Flange part 12 Cross frame 15 Support arm 16 Blade 17 Hydraulic cylinder 17b Cylinder cylinder

Claims (4)

[Claims] 1. A construction machine in which a base end portion of a support arm is vertically swingably attached to a car body of a lower traveling body in which an upper swing body is swingably supported, and a blade is attached to a tip end portion of the support arm. In order to mount the hydraulic cylinder between the support arm and the car body side so as to swing the blade up and down, the mounting structure of the blade hydraulic cylinder in a construction machine in which the hydraulic cylinder is installed inside the car body. 2. The car body according to claim 1, wherein the car body has a cylindrical frame having a flange portion to which a turning circle is attached on an upper surface thereof, and the cylinder cylindrical portion of the hydraulic cylinder is internally supported on an inner peripheral side of the cylindrical frame. Structure for installing hydraulic cylinders for blades in existing construction machinery. 3. The car body according to claim 1, wherein the car body includes a cylindrical frame having a flange portion to which a turning circle is attached on an upper surface thereof, and an upper and lower cross frame connecting the cylindrical frame and the track frame. A mounting structure of a hydraulic cylinder for a blade in a construction machine in which a cylinder portion of a hydraulic cylinder is internally supported in an inner peripheral side or a left and right outer space of the cylindrical frame while being positioned between the upper and lower cross frames. 4. The blade for a construction machine according to claim 1, 2 or 3, wherein a cylinder attachment portion to which a tip portion of a hydraulic cylinder is attached is integrally formed with a base end portion of the support arm attached to the car body. Hydraulic cylinder mounting structure.