JP2003034948A - Link rod equipped with quick coupler function - Google Patents

Abstract

PROBLEM TO BE SOLVED: To overcome problems such that the great weight of a quick coupler at the mounting of the quick coupler exerts a bad influence upon the performance of a hydraulic backhoe and such that the manufacturing cost of a quick coupler device gets high to make application limited, in the conventional hydraulic excavator. SOLUTION: A link rod 1 equipped with a quick coupler function is composed of a link rod body 2 and a coupling fitting 3; a hydraulic-cylinder's-side boss 7 and a bucket's-side boss 8 are provided at both ends of the rod body 2; the boss 8 is composed of an integral-type boss having a C-shaped cross section; and a hook 13, which is pivotally mounted on an intermediate part of the boss having the C-shaped cross section, is supported oscillatably by the small-diameter hydraulic cylinder 11 which is pivotally mounted on the rod body 2. The boss 8 is made to abut on a pin 15 in a state in which the cylinder 11 is contracted; the cylinder 11 is extended; and the hook 13 is turned around a pin 12, so that the pin 15 can be prevented from coming off even during the operation of a bucket.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a link device for transmitting hydraulic pressure of a hydraulic excavator.

[0002]

2. Description of the Related Art Conventional hydraulic excavators are often equipped with attachments for excavation and loading work for excavation work, and it is necessary to replace them with different attachments such as various buckets according to various work contents. However, in that case, it is general to attach / detach the pin at the tip of the arm and the tip of the link rod to replace the attachment manually. It should be noted that, by mounting a device generally called a quick coupler that can attach and detach various attachments by hydraulic operation of a hydraulic excavator through the pins of the arm tip and the link rod tip, the attachment can be attached and detached by hydraulic operation. However, the weight of the quick coupler is large, which adversely affects the performance of the hydraulic excavator, and the manufacturing cost thereof becomes high, so that the applicable range is limited.

[0003]

In the conventional hydraulic excavator, when it is necessary to replace the attachment for excavation and loading work with a different attachment, the quick coupler is attached and detached by hydraulic operation. However, since the weight of the quick coupler becomes large, the performance of the hydraulic excavator is adversely affected, and the manufacturing cost of the quick coupler device becomes high, and the application is limited. With a device that can reduce manufacturing costs, a device with a wide range of application in which various attachments can be attached and detached by hydraulic operation is realized.

[0004]

In order to achieve the above object, in a link rod having a quick coupler function of the present invention, a link device for transmitting the hydraulic pressure of a hydraulic cylinder mounted on an arm of a hydraulic excavator to a bucket. In the state where the two pins are attached to the ear piece of the bucket, a hook provided in the middle of the integral C-shaped cross-section boss at the tip of the link rod is fixed to the link rod body by a small diameter hydraulic cylinder provided in the link rod. The pin can be pivotally mounted on one of the two pins by rotating it around the other end, and one end can be pivotally mounted on the C-shaped cross-section boss and the other end can be mounted on the tip boss of the arm. A bracket is attached to a bracket mounted via a pin so that the bracket can swing, and the bracket has a U-shaped cross-sectional opening. The bracket can be attached to the other of the two pins, and the attachment and detachment of the bucket can be done by expanding and contracting the hydraulic cylinder equipped with the hydraulic excavator and the small diameter hydraulic cylinder from the operating room of the hydraulic excavator. It is possible to realize the quick coupler function with the minimum weight increase due to, etc., and to realize a device that can reduce the adverse effect of the weight increase on the performance of the hydraulic excavator and reduce the manufacturing cost compared to the conventional quick coupler device. .

[0005]

DESCRIPTION OF THE PREFERRED EMBODIMENTS A link rod having a quick coupler function according to the present invention will be described with reference to the drawings. A link rod 1 shown in a perspective view of FIG. The rod main body has a function of transmitting the hydraulic pressure of the hydraulic cylinder 5 attached to the arm 4 of the hydraulic excavator to the bucket earpiece 6, but the link rod 1 of the present invention has a quick coupler function in conjunction with the connecting fitting. It is characterized by

First, the link rod main body 2 will be described with reference to a side view taken along the line AA 'of FIG. 1. A hydraulic cylinder side boss 7 and a bucket side boss 8 are provided at both ends of the link rod main body 2. The bucket side boss is composed of an integral type boss having a C-shaped cross section, and a pair of brackets 9 is provided at a position close to the hydraulic cylinder side boss, and a rear end portion of the small diameter hydraulic cylinder 11 is swingable by a pin 10. It will be configured to support.

Furthermore, a pin 14 fitted into a hole at the rear end of a hook 13 that is swingably supported around a pin 12 mounted in a hole near the bucket side boss of the link rod body. The tip of the small-diameter hydraulic cylinder is swingably supported via the pin so that the pin 15 mounted on the bucket earpiece 6 extends to the back of the bucket-side boss 8 when the small-diameter hydraulic cylinder is contracted. By inserting the small diameter hydraulic cylinder and rotating the hook 13 about the pin 12 in the inserted state, the pin attached to the bucket ear piece can be prevented from coming off during the bucket operation. The cylinder 16 extends and the hook can be fixed by the lock pin 17 at the tip thereof.

On the other hand, in the side view showing an example of the conventional quick coupler device shown in FIG. 2, the link rod 51 has a linear side shape having an arm side boss 52 and a bucket side boss 53 at both ends, and a hydraulic cylinder of the arm. 5 through the pins 25 and 15 to the quick coupler device 5
The quick coupler device generally has a weight several times to several tens of times that of the link rod 51. By providing the quick coupler function, the above quick coupler device can be omitted and the weight can be greatly reduced.

Next, the structure of the attachment / detachment mechanism of the link rod body 2 will be described with reference to FIG. 3. The left side of FIG. 3 shows the state where the small diameter hydraulic cylinder 11 contracts and the hook 13 opens, and the right side of the pin 15 has the pin 15 described above. After inserting the bucket side boss 8 with the hook open, the small diameter hydraulic cylinder extends to rotate the hook 13 around the pin 12 and the hook 13 is closed. By using the boss 8 as an example, an integrated boss having a C-shaped cross section shown in a perspective view of FIG. 4, the small-diameter hydraulic cylinder can be expanded and contracted to attach and detach the pin 15, and the lock hydraulic cylinder 16 and the lock pin 17 can be attached. Then, the rotation of the hook can be fixed.

Further, as shown in FIG. 4, the central portion of the integral boss having the C-shaped cross section is recessed, and the C-shaped welded outer peripheral portion of the central portion is welded to one end of the connecting fitting body 18. An arm-side boss 20 having a C-shaped cross-section, which is mounted in a state in which a bucket-side boss 19 having a cross-sectional shape is swingably supported and is welded to the other end of the connecting fitting body, has a tip at a tip boss 21 of the arm. The bracket 26 attached via the pin 27 is attached to the open outer periphery of the central portion of the U-shaped cross-section of the bracket 26, which is swingably supported.

Next, a state in which the bucket-side boss 19 welded to one end of the connecting fitting body 18 is mounted on the bucket-side boss 8 of the link rod body 2 is a cross section taken along the recessed central portion of the bucket-side boss. 5, when the bucket-side boss 19 shown on the left side is mounted on the bucket-side boss 8 of the link rod body 2, the opening of the bucket-side boss 8 having a C-shaped cross-section (indicated by diagonal lines). It is possible to mount the bucket-side boss 19 on the right side, but the bucket-side boss 19 has a size and shape that does not separate from the bucket-side boss 8 of the link rod body 2 in the movable range when the bucket is mounted on the right side.

Similarly, the arm-side boss 20 having a C-shaped cross-section at the other end of the connecting fitting body has a U-shaped cross-section having an opening in a bracket 26 attached to a tip boss 21 of the arm through a tip pin 27. FIG. 6 is an explanatory view of the situation of mounting on the outer peripheral portion of the recessed portion in the center, as shown in FIG.
Although it is possible to mount the bracket 26 depending on the position of the opening of the bracket 26 having a mold cross-sectional shape, the arm-side boss 20 has a size and shape that does not separate from the central portion of the bracket 26 in the movable range when the bucket is mounted on the right side. It will be configured.

Finally, a side view showing a state in which the bucket 22 is attached and detached by the link rod having the quick coupler function of the present invention will be described. Referring to FIG. 7, as shown in the left figure, the pin 15 and the pin 24 are provided on the bucket ear piece 6. After the bracket 26 at the tip of the arm body 23 is operated by a hydraulic excavator to attach it to the pin 24, the small diameter hydraulic cylinder 11 is contracted and the pin 15 is inserted into the bucket side boss 8 Extend the small hydraulic cylinder above to hook 13
Is rotated about the pin 12 so that the pin 15 attached to the bucket ear piece can be prevented from coming off during the bucket operation as shown in the right figure, and the lock hydraulic cylinder 16 and the lock pin 17 prevent the hook from rotating. Can be fixed.

On the contrary, when the bucket 20 is removed, as shown in FIG.
Lock pin 17 and lock hydraulic cylinder 1
After releasing the fixing of the hook 13 by 6, the small-diameter hydraulic cylinder 11 is contracted, the hook 13 is rotated in the opposite direction about the pin 12 to the state shown in the left figure, and then the bracket 26 is attached to the arm body 23 by a hydraulic excavator. Since it can be operated and removed from the pin 24, the bucket can be attached and detached by hydraulic operation from the operation chamber of the hydraulic excavator as in the conventional hydraulic operation quick coupler device.

Further, the connecting metal fitting body 18 when the bucket is mounted
The interference between the link rod body 2 and the link rod body 2 is, as shown in FIG.
(Shaded display) and the shape corresponding to the bent shape of the link device body can reduce the interference of the connecting fittings during excavation work of the hydraulic excavator.

[0016]

As a result, in the link device having the quick coupler function of the present invention, the bucket can be attached and detached by expanding and contracting the hydraulic cylinder provided in the hydraulic excavator and the small diameter hydraulic cylinder. It is possible to realize the quick coupler function with the minimum weight increase due to the equipment of and the equipment such as the small diameter hydraulic cylinder, and it is possible to reduce the weight increase compared to the conventional quick coupler device, so that the adverse effect on the performance of the hydraulic excavator It is possible to realize a device that can be reduced in number and can be manufactured at a low cost, and a device having a quick coupler function with a wide range of application can be realized.

[Brief description of drawings]

FIG. 1 is a perspective view and a side view of a link rod having a quick coupler function of the present invention.

FIG. 2 is a side view of an example of a conventional quick coupler device related to the present invention.

FIG. 3 is an explanatory view of an attachment / detachment mechanism of the link rod body of the link rod of the present invention.

FIG. 4 is an explanatory view of a linking metal fitting of the link rod of the present invention.

FIG. 5 is an explanatory diagram showing how the connecting bracket of the present invention is attached to the link rod body of the boss on the bucket side.

FIG. 6 is an explanatory diagram of how the connecting metal fitting of the present invention is mounted on the bracket of the arm-side boss.

FIG. 7 is an explanatory view of attaching and detaching the bucket of the link rod of the present invention.

FIG. 8 is an explanatory diagram of interference between the link rod connecting fitting of the present invention and the link rod body.

[Explanation of symbols]

1 link rod 2 Link rod body 3 connection metal fittings 4 arms 5 hydraulic cylinder 6 bucket ear wire 7 Hydraulic cylinder side boss 8 bucket side boss 9 bracket 10 pin 11 Small diameter hydraulic cylinder 12 pin 13 hooks 14 pin 15 pin 16 lock hydraulic cylinder 17 Lock Pin 18 Connecting bracket body 19 Bucket side boss 20 Arm side boss 21 Tip boss 22 buckets 23 Arm body 24 pin 25 pin 26 bracket 27 Tip pin 51 Link Rod 52 Arm side boss 53 Bucket side boss 54 Quick coupler device 55 ear wire 56 Ear metal reinforcement plate

Claims (2)

[Claims] 1. A link device for transmitting hydraulic pressure of a hydraulic cylinder mounted on an arm of a hydraulic excavator to a bucket, with a small-diameter hydraulic cylinder provided on a link rod in a state where two pins are mounted on an ear metal of the bucket. A hook provided in the middle of the integrated C-shaped cross-section boss at the tip of the link rod is rotated around a pin fixed to the link rod body, so that the link rod body can swing on one of the two pins. A connecting metal fitting that can be mounted and that is swingably mounted at one end to the C-shaped cross-section boss and swingably mounted at the other end to a bracket that is mounted to the arm tip boss via a tip pin; The hydraulic excavator is equipped with a bracket having a U-shaped cross-sectional opening so that the bracket can be attached to the other of the two pins and the bucket can be attached to and detached from the hydraulic excavator. A link rod with a quick coupler function that is made possible by expanding and contracting the hydraulic cylinder and the small diameter hydraulic cylinder. 2. The interference between the bucket and the link rod body at the time of operating a bucket during excavation work of a hydraulic excavator by forming the connecting fitting into a bent shape corresponding to the bent shape of the link rod body. A connecting metal fitting that can be made smaller.