JPH09287163A - Working machine of hydraulic shovel - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce the weight and increase the durability, by providing pins fixed to the bracket of a working tool, and a fixing member provided with a smaller slit in which the pin is inserted, than the maximum pin diameter and a fixing part of the pin and decreasing the surface pressure of the fixing part. SOLUTION: A fitting link 1 in which the front ends 38a, 38b of a working machine link are connected to long holes, is set perpendicular and the slit 2a of the fitting member 2 is turned downward to fit to pins 3a, 3b. Then, a bucket cylinder is stretched to move the working link 38 forward and the holes of the front end of the fitting link 1 is positioned to coincide to the fitting holes of the pin of the bucket brackets 35a, 35b. And the pin 39 is inserted for a detent. And the pins 3a, 3b are fitted to the fixing part of the fitting member 2 to securely fix a working tool like a bucket and an arm. Accordingly, the fixing part of the pin 3 and the fixing part of the fitting member 2 are arranged to contact these mutual planes and hence, the surface pressure is reduced. In this way, the contact width of the pin 3 and the fitting member 2 can be lessened, the fitting member 2 can be lightened and the cost can be reduced.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine for a hydraulic excavator in which working tools such as a bucket and a breaker are detachably attached to an arm tip of the working machine for the hydraulic shovel through an engaging link.

[0002]

2. Description of the Related Art Hydraulic excavators are widely used for gravel and soil extraction, road construction, farmland preparation, land preparation, water and sewer construction, and building foundation construction. In addition to various buckets used for these operations, various work machine attachments such as hydraulic breakers and crushers have been developed and provided. Generally, in the case of small-scale construction, the number of hydraulic excavators to be input is small, and it is necessary to carry out several operations with one hydraulic excavator, and work tools such as buckets (various work machine attachments) using a quick coupler. By making effective use of these, efficient construction is possible.

A conventional hydraulic excavator will be described with reference to FIG. An upper swing body 23 is mounted on a lower traveling body 21 of the hydraulic excavator 20 via a swing circle 22. The upper swing body 23 can swing by a swing motor (not shown). A work machine 30 is attached to the upper swing body 23. The work machine 30 includes a boom 31, an arm 33, and a bucket 35, and the hydraulic hydraulic loaders 32, 3 are provided.
It is driven by 4, 36.

By the way, the conventional quick coupler 60 has four
There is a point support structure, which will be described with reference to FIG. The arm 51 is connected to the bucket cylinder 52 and the link 53 via a lever 54. The quick coupler 50 is connected to the tip end of the arm 51 by a pin 50a, is rotatably connected by a link 53 and a pin 50b, and is connected by one end of a bracket 55a of the bucket 55 by a pin 50c and the other end of the bracket 55a. And pin 5
It is connected by 0d. The pin 50c is adapted to engage with a groove provided in the quick coupler 60, as shown in a detailed view of a portion P in FIG. 15, to facilitate the mounting of the bucket 55. When the quick coupler 50 is used, the bucket 55 rotates around the pin 50a of the arm 51, so that the bucket 55 rotates about the turning radius R0 when the quick coupler 50 is not used. Has become.

The present applicant has filed an application for a working machine for a hydraulic excavator using a three-point supporting quick coupler in Japanese Patent Application No. 7-317327. The content of this application is such that a chisel of a breaker can be inserted between a first bracket and a second bracket that are fixed to a hackett and are separated from each other on the left and right.

[0006]

A pin 50c which engages with a hook portion of a conventional four-point supporting quick coupler 60 is shown in FIG.
As shown in the detailed view of P part of No. 5, there is a problem that the line contact occurs, a large surface pressure is generated and the engaging part is worn early. For this reason, it is necessary to make the plate material of the quick coupler 60 thick, which causes a problem that the weight becomes heavy, and the four-point support causes a large size and a high cost.

Further, when the four-point-supporting quick coupler shown in FIG. 11 is used, the bucket blade edge force FE decreases in proportion to R0 / R, and the blade edge force equivalent to that when no quick coupler is used is obtained. There is a problem that you can not. In addition, the operating angle of the bucket blade edge increases as the turning radius increases, so if the work machine is operated as if driving without using the quick coupler, the bucket blade edge would be displayed on the lower surface of the boom, the back of the arm, or the cab. There is a problem of causing collision.

In addition, when exchanging a standard bucket for another work tool with one hydraulic excavator, if the mounting pin diameter is different, the boss portion of the bracket of the work tool or the like needs to be corrected or additionally worked. There is a problem that it becomes extremely difficult. Further, in the case of the quick coupler having the four-point support structure shown in FIG. 15, when exchanging the bucket with the breaker, it is necessary to remove the two pins 50c and 50d, which takes a lot of time for exchanging work. Also, the pins 50c, 5
0d has a problem of being deformed and damaged by repeated attachments and detachments.

The present invention focuses on the above-mentioned conventional problems, and a quick coupler for connecting the tip of an arm, a work implement link, and a work implement such as a bucket has a pin and an engaging member for engaging the work implement such as a bucket. The surface pressure of the engaging part is lowered to reduce the weight and durability, and the bucket blade tip force is not significantly reduced by approaching the bucket turning radius when the quick coupler is not used, and the mounting pin diameter is different. Another object of the present invention is to provide a hydraulic excavator work machine in which other work implements can be easily replaced, and in which a work implement such as a bucket can be replaced by removing only one pin of the quick coupler.

[0010]

In order to achieve the above object, a first invention of a working machine for a hydraulic excavator according to the present invention is a working tool such as a boom, an arm and a bucket which are sequentially connected from a vehicle body, An engagement link that is connected to one end of the work implement such as the bucket and that engages with the work implement link, and an engagement member that is connected to the other end of the work implement such as the bucket and that engages with the arm. In a working machine for a hydraulic excavator equipped with a pin 3a, 3b fixed to brackets 35a, 35b of a working tool 35 such as the bucket, and a pin 3
The engaging member 2 has slit portions 2a, 2a smaller than the maximum diameters of the pins 3a, 3b into which the pins a, 3b are inserted and fixing portions 2c, 2c for fixing the pins 3a, 3b. . According to the above configuration, as shown in FIGS. 3 to 5, the slit portions 2a, 2a of the engaging member 2 are inserted into the tips of the pins 3a, 3b, and the engaging members 2 are integrally fixed. By rotating the coupling link 1 by approximately 90 °, the pins 3a and 3b engage with the fixed portions 2c and 2c of the engaging member 2, so that the work implement 35 such as a bucket and the arm can be reliably engaged. Therefore, the engaging portions between the pins 3a and 3b and the fixing portions 2c and 2c of the engaging member 2 come into surface contact with each other, so that the surface pressure is small and abrasion of the engaging member 2 and the pins 3a and 3b can be prevented, so that durability is improved. And the surface pressure can be reduced by the structure of the pins 3a and 3b and the engaging member 2. Therefore, the contact width between the pins 3a and 3b and the engaging member 2 can be reduced, so that the engaging member 2 is lightweight and the cost is low.

A second aspect of the present invention is a work tool such as a boom, an arm and a bucket which are sequentially connected from the vehicle body, and an engagement which is connected to both ends of the work tool such as the bucket and is engaged with the work machine link and the arm. In a hydraulic excavator work machine including a link, a pin 45 fixed to the brackets 35a and 35b of the work implement 35 such as the bucket, and a pin 45.
Slit part 1 smaller than the maximum diameter of the pin 45 for inserting
0c and an engaging link 10 having a fixing portion 10d for fixing the pin 45. According to the above configuration, the slit 45 of the engagement link 10 is inserted into the tip of the pin 45 and the engagement link 10 is rotated by approximately 90 °, so that the pin 45 is fixed to the fixing portion 1 of the engagement link 10.
Since it is engaged with 0d, it can be reliably engaged with the work implement 35 such as a bucket. Therefore, since the engaging portion between the pin 45 and the fixed portion 10d of the engaging link 10 comes into contact with the surface, the surface pressure is small and abrasion of the engaging link 10 and the pin 45 can be prevented. The structure of the pin 45 and the engagement link 10 makes it possible to reduce the surface pressure. Therefore, since the contact width between the pin 45 and the engagement link 10 can be reduced, the engagement link 10 is lightweight and the cost is low.

According to a third aspect of the present invention, there is provided a boom and arm sequentially connected to a vehicle body, and a hydraulic excavator working machine in which a bucket is attached to a tip of the arm via an engaging link.
Brackets 35a and 35b fixed to the bucket 35
And the pins 3a, on one side of the brackets 35a, 35b.
An engaging member 2 supported by 3b and connected to the arm 33, one end fixed to the engaging member 2, and the other end engaging the other side of the brackets 35a and 35b and the working machine link 38 with a pin 39. And the engaging link 1 having the elongated hole 1a. According to the above configuration, even if the distance between the two attachment holes of the arm 33 provided on the brackets 35a and 35b of the bucket 35 and the work implement link 38 is different, the long hole provided in the engagement link 1 is provided. The working machine link 38 can be moved by 1a, the hole of the working link 38 and the hole of the brackets 35a and 35b of the bucket 35 can be aligned, and the pin 39 can be inserted and mounted. Therefore, it is possible to easily attach work implements such as buckets of each manufacturer with one hydraulic excavator without any repair work or the like, so that work efficiency is improved. In this case, in order to adjust the distance between the two attachment holes of the arm 33 and the work implement link 38, in addition to the elongated hole 1a provided in the engagement link 1, for example, a movable hook is provided on the engagement link 1. It is also possible to provide (a device that can be expanded and contracted by a spring or the like) so that the working machine link 38 can be attached to this movable hook. Moreover,
Since the engagement link is manufactured from a single steel plate, it is lightweight, can be easily installed by one person, and the manufacturing cost is low. Further, since the engaging link has a two-point support structure, the turning point of the bucket 35 does not change, and the bucket blade tip force equivalent to that when the engaging link is not used can be obtained.

A fourth aspect of the present invention is the structure of the third aspect, wherein the arm 33 and the bracket 35a of the bucket 35,
35a are provided with slits 2a and 2b in the engaging member 2 that engages with the tips of the pins 3a and 3b, and the engaging link 1 fixed to the engaging member 2 is rotated by about 90 °. The pins 3a and 3b are fixed to the fixing portion 2c of the engaging member 2. According to the above configuration, when the engagement link 1 is brought into a substantially vertical state, the tip ends of the pins 3a and 3b and the slit portion 2a of the engagement member 2 are engaged with each other, and the engagement link 1 is made substantially in this state. When rotated by 90 °, the pins 3a and 3b engage with the fixed portion 2c of the engaging member 2 and do not come out from the slit portion 2a. In this case, the thickness T0 of the tips of the pins 3a, 3b, the pin 3a,
Assuming that the maximum diameter T1 of 3b is T1 and the opening amount T3 of the slit portion 2a is T3, T0 <T3, T1> T3. Therefore, the engagement link and the engagement member can be reliably maintained in the engaged state only by rotating the engagement link by approximately 90 °.

A fifth aspect of the invention is the configuration of the third or fourth aspect of the invention, in which the engaging member 2 and the engaging link 1 are fixed to each other by a pin 2b. According to the above configuration, since the engaging member 2 and the engaging link 1 are fixed to each other, the slits 2a, 2a of the engaging member 2 and the pins 3a, 3b can maintain a constant relative relationship. .
Therefore, the work implement 35 such as a bucket can be reliably engaged.

According to a sixth aspect of the present invention, a work tool such as a boom, an arm and a bucket, which is sequentially connected from the vehicle body, is connected to both ends of the work tool such as the bucket, and is engaged with the work machine link and the arm. In a hydraulic excavator working machine provided with a link, a first connecting portion 40 for connecting to the arm tip portion, and a bracket 35 for a working tool such as a bucket.
a hook-shaped second connecting portion 4 which is connected to one end of a, 35b
1 and brackets 35a, 35b for work implements such as buckets
Long hole-shaped third connecting the other end of the work machine link 38 together
The engaging link 10 having the connecting portion 42 of the working machine link 38, and the connecting hole of the working machine link 38 and the third connecting portion 42 having the long hole shape of the engaging link 10, and mounting various working tools. Pipe members 43 having different hole diameters D3 corresponding to the holes,
The pin 39 is inserted into the pipe member 43 and various work tools are attached to the pin 39 having different outer diameters. According to the above configuration, if various kinds of pipe members 43 having different hole diameters D3 and pins 39 having different outer diameters are prepared, various types of work tools such as standard buckets, slope buckets, breakers and gripping devices can be obtained. Replacement installation is possible. As a result, various work tools, or even if the pin diameters of the work tools differ from one manufacturer to another, if pipe members 43 having different hole diameters D3 are prepared, the work tools can be easily replaced without repair work. It will be possible. Further, since the pipe-shaped member 43 and the pin 39 do not move relative to each other, they do not wear. Furthermore, when the work implement is replaced, the pipe member 4
Since it is not necessary to disassemble the sliding portion between the work piece No. 3 and the working machine link 38, dust is not mixed in and the wear life is extended. Therefore, by using various pipe members 43 having different hole diameters, various working tools such as buckets and breakers can be mounted, and further, the wear life of the connecting portions such as the engagement link 10 and the pin 39 is extended and the durability is improved. The property is improved. Furthermore,
In the conventional quick coupler, as shown in FIG. 15, the two pins 50c and 50d were removed and the bucket was replaced with another working tool. However, according to the present invention, the pin 3 of the engagement link 10 is replaced.
If only one 9 is removed, the hook portion 10b can be detached from the pin 45, so that it is easy to replace the bucket with another work tool, and the replacement time can be shortened. Further, since the pipe member 43 and the pin 39 do not slide, it is not necessary to lubricate the inner cylindrical portion of the pipe member 43 and the outer peripheral portion of the pin 39 with grease. In the conventional grease lubrication structure, a grease hole is machined in the pin, but the pin 39 of the present invention does not require machining of the grease hole, and is therefore easy to manufacture.

In a seventh aspect of the invention, in the structure of the sixth aspect of the invention, notches 43a are provided at the left and right ends of the pipe member 43, and a slit portion 10e for receiving and stopping the notches 43a is provided in the engagement link 10. It has a different structure. According to the above configuration, the slit portion 10e of the engagement link 10 and the notch portion 43a of the pipe member 43 are slidably engaged. The contact between the two becomes a plane contact. Therefore, the engagement link 10 and the pipe member 43 do not rotate relative to each other, and since the contact surface is wide, the wear life is extended and the durability is improved.

[0017]

BEST MODE FOR CARRYING OUT THE INVENTION An embodiment of a working machine for a hydraulic excavator according to the first embodiment of the present invention will be described below with reference to FIGS. 1 to 5. The same reference numerals as in FIG. 14 are the same, and detailed description of the configuration is omitted. First, the arm 33 shown in FIG. 1 and the lever 3 operated by the bucket cylinder 36.
A link 38 interlocking with 7 is attached to the brackets 35a, 35b of the bucket via the engagement link 1. The engagement state between the arm 33 and the link 38 and the engagement link 1 will be described with reference to FIG.

Next, the bracket 35a and the bracket 35b, which are separated from each other in the left and right directions in FIG. 2, are fixed to the bucket 35. One end of the engaging link 1 and the engaging member 2 are integrally fixed by a pin 2b. The engaging member 2 is connected to the arm 33, and the left and right ends are pins 3
It is engaged by a and 3b. The pins 3a and 3b are integrally fixed to the bracket 35a and the bracket 35b by rotation prevention. The other end of the engagement link 1 and the tip portions 38a and 38b of the link 38 of the working machine are connected to each other by a connecting member 38c.
Are linked by A pin 39 is provided in a hole in which the engaging link 1 and the tip end portions 38a and 38b of the link 38 of the working machine are aligned.
Is inserted. This pin 39 is the bracket 35a
It is fixed integrally by a rotation stopper. Section AA and section BB shown in the drawings will be described with reference to FIGS.

The cross section AA of FIG. 2 will be described with reference to FIG.
The tip of the pin 3a, which is integrally fixed to the bracket 35b of the bucket 35 by rotation prevention, has the shape of the hatched portion shown in the figure. The diameter of the pin 3a is set to be larger than the opening amount of the slit portion 2a of the engaging member 2. Therefore, as shown in the figure, the engaging member 2 cannot be disengaged from the pin 3a, and the engaged state is shown. The cross section BB of FIG. 2 will be described with reference to FIG. The tip of the pin 3b, which is integrally fixed to the bracket 35a of the bucket 35 by a rotation stop, has the shape of the hatched portion shown in the figure. The diameter of the pin 3b is set to be larger than the opening amount of the slit portion 2a of the engaging member 2. Therefore, as shown in the figure, the engagement member 2 cannot be disengaged from the pin 3b, and the engagement state is shown. Because of this, both ends of the engaging member 2 are engaged with the pins 3a and 3b and are securely held.

Next, the operation of FIGS. 1 to 4 will be described with reference to FIG.
This will be described with reference to FIG. As shown in FIG.
The distal end portions 38a and 38b of the link 38 of the working machine are connected to the elongated hole 1a of the engagement link 1 via the connecting member 38c. When the engagement link 1 is brought into a substantially vertical state, the slit portion 2a of the engagement member 2 is directed downward, and the pins 3a and 3b.
Can be engaged with the tip of the. When the bucket cylinder 36 is extended from this state, the work implement link 38 is operated forward via the lever 37, and the engagement link 1 moves in the direction indicated by the arrow. Then, as shown in FIG. 5 (b), the engagement link 1 is rotated by approximately 90 °, and the work implement link 38 is movable in the elongated hole 1 a of the engagement link 1. Holes at the tip and bucket brackets 35a, 3
5b is aligned with the pin mounting hole 40, and the pin 39 shown in FIG. 2 is inserted to prevent rotation. By rotating the engagement link 1 by approximately 90 °, the slit portion 2a of the engagement member 2 is formed.
Is to the right, and the pins 3a and 3b are in engagement with the fixed portions 2c and 2c of the engagement member 2.

As described above, the slit portions 2a, 2a of the engaging member 2 are inserted into the tips of the pins 3a, 3b, and the engaging link 1 integrally fixed to the engaging member 2 is rotated by about 90 °. By doing so, the pins 3a and 3b engage with the fixed portions 2c and 2c of the engaging member 2, so that the working tool 35 such as a bucket and the arm can be reliably engaged. Therefore, the pins 3a, 3b
Since the engaging portions between the fixing portions 2c and 2c of the engaging member 2 come into surface contact, the surface pressure is small and the engaging member 2 and the pins 3a and 3b are small.
Since the wear of the pins can be prevented, the durability can be improved, and the surface pressure can be reduced by the structure of the pins 3a and 3b and the engaging member 2. As a result, the contact width between the pins 3a and 3b and the engaging member 2 can be reduced, so that the engaging member 2 is lightweight and the cost is low.

Further, the bracket 35a of the bucket 35,
Even if the distance between the two attachment holes of the arm 33 and the work implement link 38 provided on 35b is different, the work implement link 38 is moved by the elongated hole 1a provided on the engagement link 1 The hole of the link 38 and the bracket 35a of the bucket 35,
The pin 39 can be inserted and mounted by aligning with the hole of 35b. Therefore, it is possible to easily attach work implements such as buckets of each manufacturer with one hydraulic excavator without any repair work or the like, so that work efficiency is improved. In this case, in order to adjust the distance between the two attachment holes of the arm 33 and the work implement link 38, in addition to the elongated hole 1a provided in the engagement link 1, for example, a movable hook is provided on the engagement link 1. It is also possible to provide (a device that can be expanded and contracted by a spring or the like) so that the working machine link 38 can be attached to this movable hook. Moreover, since the engagement link is manufactured from a single steel plate, it is lightweight, can be easily mounted by one person, and the manufacturing cost is low. Since the engagement link 1 has a two-point support structure, the turning point of the bucket 35 does not change, and the bucket blade force equivalent to that when the engagement link 1 is not used can be obtained.

Furthermore, since the engaging member 2 and the engaging link 1 are fixed by the pin 2b, the relative relationship between the slit portions 2a, 2a of the engaging member 2 and the pins 3a, 3b can be kept constant. Therefore, the work implement 35 such as a bucket can be reliably engaged.

Next, an embodiment of the working machine for the hydraulic excavator according to the second embodiment of the present invention will be described with reference to FIGS. 6 to 9.
It is to be noted that the components denoted by the same reference numerals as those in FIGS. 1 to 4 are the same and will be described with reference to FIGS. The working machine of the second hydraulic excavator uses the engagement link 10 that supports three points. As shown in FIG. 6A, the arm 33 supports the engagement link 10 by the pin 33a. The pin 33a serves as the pivot point of the bucket 35. Pins 45 are attached to the brackets 35a and 35b of the bucket. As shown in FIGS. 6B and 7 of the CC cross section of FIG. 6A, the engagement link 10 connected to the arm 33 and the work implement link 38 moves in the direction shown by the arrow in FIG. 7. Then, the slit portion 10c of the hook portion 10b of the engagement link 10 is inserted into the pin 45, and the engagement link 10 is replaced by approximately 9
By rotating 0 °, the pin 45 engages with the fixed portion 10d of the engagement link 10. As a result, the pin 45 does not come out of the slit portion 10c of the hook portion 10b, so that the pin 45 can be reliably engaged. A lever 37 that operates with a bucket cylinder 36 is attached to the arm 33. Working machine link 38 connected to this lever 37
Is the long hole 10 provided in the engaging link 10 as in FIG.
a and the tip end portion 38a of the link 38 of the working machine are the connecting member 38.
and the engagement link 10 and the link 38 of the working machine.
The pin 39 is inserted into the matching hole of the front end portion 38a of the. The pin 39 is integrally fixed to the bracket 35a by a rotation stop.

As shown in FIG. 8 in FIG. 7 viewed from Z and in FIG. 9 in section D-D in FIG. 8, a pin 45 engaged with the hook portion 10b.
Has a shape having a straight line portion and a circular portion whose cross sections are parallel to each other. When the engagement is started, the slit portion 10c of the hook portion 10b is engaged with the parallel straight line portion of the pin 45, and then, By rotating the engagement link 10 forward by about 90 °, the fixing portion 10d of the hook portion 10b is fixed to the pin 45.
Engage with the circular part of. Therefore, the engagement link 10 can be maintained in the engaged state without being disengaged from the pin 45.

Next, the operation of FIGS. 6 to 9 will be described. The slit portion 10 of the engaging link 10 is provided at the tip of the pin 45.
By inserting c and rotating the engagement link 10 by approximately 90 °, the pin 45 engages with the fixed portion 10d of the engagement link 10, so that it can be reliably engaged with the work implement 35 such as a bucket. Therefore, the fixing portion 1 of the pin 45 and the engagement link 10
Since the engaging portion with 0d comes into contact with the surface, the surface pressure is small and wear of the engaging link 10 and the pin 45 can be prevented, so that the durability is improved and the structure of the pin 45 and the engaging link 10 improves the surface pressure. Can be reduced. As a result, the contact width between the pin 45 and the engagement link 10 can be reduced, so that the engagement link 10 is lightweight and low in cost. Further, as in the first embodiment, it is possible to easily attach various work implement attachments of each manufacturer with one hydraulic excavator.

Next, an embodiment of the hydraulic excavator working machine according to the third embodiment of the present invention will be described with reference to FIGS. It is to be noted that the components denoted by the same reference numerals as those in FIGS. 1 to 9 are the same and will be described with reference to FIGS. FIG. 10 is a side cross-sectional view showing the mounting portion of the bucket 35 of the working machine of the third hydraulic excavator, and uses the engagement link 10 of three-point support like the working machine of the second hydraulic excavator. .
As shown in FIG. 10, the engagement link 10 is supported by the pin 33 a at the tip of the arm 33, and constitutes the first connecting portion 40. The hook portion 10b of the engagement link 10 is engaged with the pin 45 fixed to one end of the brackets 35a and 35b fixed to the bucket 35 to form the second connecting portion 41. The detent slit portion 10e of the elongated hole 10a provided at the tip of the engagement link 10, the other ends of the brackets 35a and 35b of the bucket 35, and the working machine link 38 are connected together, and the third connection is formed. It constitutes the section 42. Since the first connecting portion 40 and the second connecting portion 41 are the same as those in the second embodiment, the description thereof will be omitted, and the third connecting portion 42 will be described below.

FIG. 11 is a sectional view taken along line EE of FIG. 10 and 11, the tip portion 38 of the working machine link 38
a and the detent slit portion 10e of the engagement link 10 are positioned, and the pipe member 43 is inserted to engage them. Further, the pipe member 43 and the holes at the other ends of the brackets 35a and 35b of the bucket 35 are positioned, and the pin 39 is inserted to prevent the bracket 35a from rotating.

FIG. 12 is a sectional view taken along the line FF of FIG. 11, and FIG. 13 is a view taken along the line GG of FIG. As shown in FIG. 13, a round hole 10f is provided at one end of the elongated hole 10a of the engagement link 10, and its diameter D1 is slightly larger than the diameter D2 of the pipe member 43. As shown in FIG. 12, various kinds of pipe members 43 having different hole diameters D3 are prepared.
Work tools such as various buckets having different diameters of the mounting pins 39 can be mounted. Reference numeral 38b is a bush provided on the tip end portion 38a of the working machine link 38, and is engaged with the outer peripheral portion of the pipe member 43. As shown in FIGS. 12 and 13,
Cutout portions 43a, 43a are provided at both ends of the pipe member 43, and the pipe member 43 is inserted from one side of the round hole 10f of the engagement link 10 and then moved in the lateral direction to prevent rotation of the engagement link 10. The slit portion 10e is slidably engaged with the notch portion 43a.

Next, the operation of FIGS. 10 to 13 will be described. The first connecting portion 40 and the second connecting portion 41 are the second
Since it is the same as the embodiment, the description thereof will be omitted and the operation of the third connecting portion 42 will be described. First, the bush 38b and the pipe member 43 are inserted into the distal end portion 38a of the working machine link 38.
A bush 38b is attached to the tip 38a of the working machine link 38.
The pipe member 43 with the engaging link 10
It is inserted into the circular hole 10f and fixed in a predetermined position as shown in FIG. With this configuration, even when the work tool is replaced with another work tool having a different pin-to-pin distance, as shown in FIG. The position of the pin 39 can be set to a predetermined position by adjusting the position in 10a.

According to the third embodiment of the present invention, if various kinds of pipe members 43 having different hole diameters D3 are prepared, various working tools such as standard buckets, slope buckets, breakers and gripping devices can be replaced. It can be installed. As a result, the pipe member 43 having a different hole diameter D3 even if the pin diameter of the work tool is different depending on various work tools or manufacturers.
By preparing, the work tool can be easily replaced and attached without performing repair work. Further, the pipe-shaped member 43
Since the pin 39 and the pin 39 do not move relative to each other, they do not wear. Further, since it is not necessary to disassemble the sliding portion between the pipe member 43 and the working machine link 38 when the work implement is replaced, dust is not mixed in and the wear life is extended. Therefore, by using various pipe members having different hole diameters, various types of work tools such as buckets and breakers can be mounted, and the wear life of the connecting portions such as the engagement links and pins is extended.
Furthermore, the slit portion 10e of the engagement link 10 and the cutout portion 43a of the pipe member 43 are slidably engaged. The contact between the two becomes a plane contact. Therefore, the engagement link 10 and the pipe member 43 do not rotate relative to each other, and since the contact surface is wide, the wear life is extended. Further, in the conventional quick coupler, as shown in FIG. 15, the two pins 50c and 50d were removed and the bucket was replaced with another work implement. However, according to the present invention, the pin 39 of the engagement link 10 is If only the book is removed, the hook portion 10b can be removed from the pin 45, so that it is easy to replace the bucket with another work implement. Further, the pipe member 43 and the pin 3
Since it does not slide with 9, it is not necessary to lubricate the inner tubular portion of the pipe member 43 and the outer peripheral portion of the pin 39 with grease.
In the conventional grease lubrication structure, the grease hole is formed in the pin, but the pin 39 of the present invention does not require the formation of the grease hole.

Although the hydraulic excavator has been described as the engagement link of the working machine of the hydraulic excavator of the present invention, it goes without saying that it can be applied to other construction machines and industrial machines.

[Brief description of drawings]

FIG. 1 is a side view of a working machine for a hydraulic excavator according to a first embodiment of the present invention.

FIG. 2 is a plan view of the same.

FIG. 3 is a sectional view taken along line AA of FIG. 2;

FIG. 4 is a sectional view taken along line BB of FIG. 2;

5 (a) and 5 (b) are operation explanatory views of the engagement link.

FIG. 6A is a side view of a working machine for a hydraulic excavator according to a second embodiment of the present invention. (B) is CC sectional drawing.

FIG. 7 is an operation explanatory view of the engagement link of the same.

FIG. 8 is a Z view of FIG. 7.

FIG. 9 is a sectional view taken along line DD of FIG. 8;

FIG. 10 is a side sectional view of a working machine for a hydraulic excavator according to a third embodiment of the present invention.

11 is a sectional view taken along line EE of FIG.

FIG. 12 is a sectional view taken along line FF of FIG. 11;

FIG. 13 is a view taken along the line GG in FIG.

FIG. 14 is a side view of the hydraulic excavator.

FIG. 15 is an explanatory view of a working machine using a conventional four-point supporting quick coupler.

[Explanation of symbols]

 1, 10 Engagement link 1a, 10a Long hole 2 Engagement member 2a Slit part 2c Fixing part 3a, 3b Pin 10b Hook part 10c Slit part 10d Fixing part 10e Detent slit part 33 Arm 35 Bucket (work tool such as bucket) 35a, 35b Bracket 36 Bucket cylinder 38 Working machine link 38a Working machine link tip 39, 45 pin 43 Pipe member 43a Notch

Claims (7)

[Claims] 1. A work tool such as a boom, an arm, and a bucket that are sequentially connected from the vehicle body, an engagement link that is connected to one end of the work tool such as the bucket and that engages with a work machine link, the bucket, and the like. Connected to the other end of the work tool of
In a hydraulic excavator work machine provided with an engagement member that engages with an arm, pins (3a, 3b) fixed to the brackets (35a, 35b) of the work implement (35) such as the bucket, and the pins (3a, 3b)
The slits (2a, 2a) smaller than the maximum diameter of the pins (3a, 3b) for inserting the pins, and the fixing parts (2c, 2c) for fixing the pins (3a, 3b)
A working machine for a hydraulic excavator, comprising: the engaging member (2) having 2. A work tool such as a boom, an arm and a bucket which are sequentially connected from the vehicle body, and an engagement link which is connected to both ends of the work tool such as the bucket and is engaged with the work machine link and the arm. In the working machine of the provided hydraulic excavator, the bracket (35a, 3a of the working tool (35) such as the bucket is provided.
5b) and the pin (45) for inserting the pin (45)
A working machine for a hydraulic excavator, comprising a slit part (10c) smaller than the maximum diameter of 5) and an engagement link (10) having a fixing part (10d) for fixing a pin (45). 3. A hydraulic excavator working machine in which a boom and an arm that are sequentially connected from a vehicle body and a working tool such as a bucket are attached to the tip of the arm via an engagement link.
Bracket (35) fixed to the work implement (35) such as the bucket
a, 35b) and one side of the bracket (35a, 35b) with a pin (3
a, 3b) and an engaging member (2) that is connected to the arm (33) and has one end fixed to the engaging member (2) and the other end on the other side of the bracket (35a, 35b). And an engagement link having an elongated hole (1a) for engaging the work implement link (38) with the pin (39)
(1) A hydraulic excavator working machine comprising: 4. An engagement member (2) engaging with a tip end of a pin (3a, 3b) for supporting the arm (33) and a bracket (35a, 35b) of the bucket (35) has a slit portion (2). 2a, 2a),
The engagement link (1) fixed to the engagement member (2) is substantially
The working machine for a hydraulic excavator according to claim 3, wherein the pin (3a, 3b) is fixed to the fixing portion (2c, 2c) of the engaging member (2) by rotating it by 0 °. 5. The engagement member (2) and the engagement link (1)
The said and are fixed by the pin (2b).
Or the working machine of the hydraulic excavator described in 4. 6. A work tool such as a boom, an arm and a bucket which are sequentially connected from the vehicle body, and an engagement link which is connected to both ends of the work tool such as the bucket and is engaged with the work machine link and the arm. In a working machine for a hydraulic excavator provided, a first connecting part (40) for connecting to the arm tip part
And a hook-shaped second connecting portion (41) for connecting to one end of the bracket (35a, 35b) of the work implement such as a bucket, and the other end of the bracket (35a, 35b) of the work implement such as the bucket and the work machine. Link
An engaging link (10) having a third connecting portion (42) in the shape of an elongated hole for connecting together (38), a connecting hole of the working machine link (38) and an elongated hole of the engaging link (10) The third connecting part (42) in the shape of
And various hole diameters D3 corresponding to the mounting holes of various work tools
Different pipe members (43), and various pins (3) with different outer diameters to be inserted into this pipe member (43) and for mounting various work tools.
9) A hydraulic excavator work machine characterized by comprising 7. The working machine for hydraulic excavator according to claim 6, wherein notches (43a) are formed at left and right ends of the pipe member (43).
The hydraulic excavator working machine is characterized in that the engaging link (10) is provided with a slit portion (10e) which is provided with a slit portion (10e) for receiving and stopping the cutout portion (43a).