JPH10231533A - Pin structure in swing connection part in work machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a pin structure for a swing connection part in which passages of pressure oil to an actuator can be secured for pins while restricting strength deterioration of the pins to the minimum, and without complicating structures of bearings to support the pins. SOLUTION: A work machine is provided with a bucket 9, a first boom 1, a second boom 3, and a third boom 5 connected by pins 2, 4 for oscillating it, an offset cylinder to drive them, and arm cylinder 14, and a bucket cylinder 17. In this case, through holes 21, 22 are formed in radial directions of the pins 2, 4 in the work machine to be passages to introduce pressure oil to the arm cylinder 14 and the bucket cylinder 17, thereby the passages of pressure oil for the pins 2, 4 can be secured while restricting deterioration of strength of the pins 2, 4 to the minimum, and without complicating structures of bearings to support the pins 2, 4.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a working machine having a working tool, a plurality of working links, and a plurality of actuators for hydraulically driving the working tools. The present invention relates to a pin structure of a swing connection portion in a working machine, which is applied to a machine and is suitable for improving the arrangement of piping near a pin connection portion connecting between respective working links of the working machine.

[0002]

2. Description of the Related Art A working machine of a conventional hydraulic working machine is called
A hydraulic excavator equipped with an offset type working machine will be described as an example. A working machine of a general offset hydraulic excavator is configured as shown in FIGS. 4 to 6, and includes a first boom 52 whose base end is connected to a revolving unit 50 by a pin 51 so as to be vertically movable, A second boom 54 having a base end connected to the distal end of the first boom 52 so as to be able to move left and right by a pin 53, and a distal end of the second boom 54 is connected to be movable left and right by a pin 55. A third boom 56 having a proximal end, an arm 58 having a proximal end movably connected to the distal end of the third boom 56 by a pin 57, and a pin A bucket 60, which is a work tool, which is swingably connected by 59, is provided with a plurality of working cylinders 61, 62, 63, and 64, which are a plurality of actuators for driving them. Each of the working cylinders 61 to 64 is a revolving unit 1
Is driven by the pressure oil from the hydraulic pumps arranged in each being guided through a total of eight (four in the figure) piping (rubber or other hoses) 65 for each two. ing. Each of the pipes 65 may cause contact with an obstacle or the like during the operation depending on its arrangement.
First boom 5 which is a working machine to avoid it as much as possible
2, it is arranged on the upper surface or the side surface along the second boom 54 and the third boom 56. However, even with such a configuration, especially around each pin connection portion, when each of the working links such as the first to third booms and the arm swings with each other, there is a slack that prevents the pipe from being pulled. This is necessary in the arrangement of the pipes, and the projecting link will protrude from the work link by the amount of the slack. This looseness causes the piping to protrude laterally at the tip of the second boom 54 at the time of offsetting, particularly in the case of the offset type working link mechanism. Proposals to prevent this have been reported in
No. 364. The working machine according to this proposal is configured as shown in FIGS. 7 to 9, and has a first boom 70 whose base end is connected to a revolving body by a pin so as to be vertically movable.
A second boom 73 having a proximal end connected to the distal end side of the first boom 70 so as to be movable left and right by pins 71 and 72 divided into two vertically, and a distal end side of the second boom 73. Boom 76 having a base end side movably connected by pins 74 and 75 vertically divided into two parts.
An arm 78 having a proximal end connected to the distal end of the third boom 76 so as to be vertically movable by a pin 77;
A bucket, which is a working tool, which is swingably connected to the distal end of the arm 78 by a pin, includes a plurality of actuators (the boom cylinder is omitted in the figure) for driving the buckets. , An arm cylinder 80 and a bucket cylinder 81. Each actuator is driven by pressure oil from a hydraulic pump disposed on the revolving structure being guided through a total of eight pipes (hoses made of rubber or the like) 82 each. Of the eight pipes 82, six pipes 82 connected to the offset cylinder 79, the arm cylinder 80, and the bucket cylinder 81 are provided with a first boom as a working machine in order to avoid contact with an obstacle as much as possible. 7
0, the second boom 73 and the third boom 76. In this case, since it is particularly difficult to secure a space for arrangement at the pin connection portion, a pin for connecting the first boom 70 and the second boom 73 and a pin for connecting the second boom 73 and the third boom 76 are particularly provided. As described above, the pins 71 and 72 and the pins 74 and 75 are respectively divided into two, and a space is formed between the pins in the axial direction, and the pipe 82 is passed there.

[0003]

In the above-described pin structure of the conventional working machine, the pins are divided into two in order to form a space for passing a pipe. The structure of the bearing becomes complicated, and in consideration of the load acting on each pin connection, the strength of the bearing must be increased as compared with the case of one pin. As a result, the pin connection becomes large, When the weight of the working machine itself increases, the stability at the time of working decreases.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and has as its object to reduce the strength of a pin as much as possible and to reduce the path of pressure oil to an actuator without complicating the structure of a bearing that supports the pin. It is an object of the present invention to provide a pin structure of a swing connection portion in a working machine that can secure a pin to a pin.

[0005]

In order to achieve the above object, a work implement, a plurality of work links connected by pins for swinging the work implement, and a plurality of actuators for driving them are provided. A hydraulic working machine, the base end of which is swingably mounted on a main body by means of a pin, wherein the working machine has a through-hole in a radial direction of the pin which serves as a path for guiding hydraulic oil to an actuator. Is formed.

[0006] The plurality of working links constituting the working machine include at least one of a boom and an arm, and an actuator is provided in a radial direction of the pin connecting the boom or the arm to another working link. A through-hole serving as a path for guiding the pressurized oil may be formed.

Further, a pipe for guiding pressure oil to an actuator may be passed through a through hole formed in a radial direction of the pin in the working machine.

The plurality of working links constituting the working machine are offset type working link mechanisms including at least a first boom, a second boom, a third boom and an arm, and are swingably attached to the main body. Second in first boom
The boom is movable left and right, the second boom is movable left and right, the third boom is vertically movable and the arm is connected by pins, and at least the second boom and the third boom are connected. A through-hole may be formed in the radial direction of the pin, and a pipe for guiding pressure oil to at least one of an actuator for driving the work implement or an actuator for driving the arm may be passed through the through-hole.

Also, there is provided a working machine comprising a working tool, a plurality of working links connected by pins for swinging the working tool, and a plurality of actuators for driving them.
In a hydraulic working machine whose base end side is swingably attached to a main body by a pin, a plurality of through holes serving as a path for guiding pressure oil to an actuator may be formed in a radial direction of the pin in the working machine. good.

[0010] Furthermore, a connecting member for pipe connection is attached to each of the open ends of the plurality of through holes formed in the pin, and a pipe for guiding pressure oil to the actuator is attached to the connecting member. Is also good.

[0011] In the pin structure of the swing connection portion in the working machine configured as described above, the path for guiding the pressure oil to the pin is formed, so that the working machine is not made heavy and the structure is not complicated. Thus, a path for the pressure oil in a narrow portion around the pin is secured. And, since the pins for connecting the working tool and the working link of the working machine are formed from one like the general one, the bearing to be supported is also similar to the general one at two places above and below the pin. It is sufficient to support, and the structure of the bearing does not become complicated.

Further, this configuration is suitable for an offset type working link mechanism in which the number of links of the working machine and the number of actuators for driving the working machine are large, and the amount of deflection of a pipe for guiding hydraulic oil to the actuator during the operation is changed. In particular, since the area around the pin connection is narrow, the path for guiding the pressurized oil to the actuator is formed in the pin itself, reducing the change in the amount of deflection of the pipe and preventing the pipe from jumping out of the work equipment. Can be reduced.

As described above, since the through-hole serving as a path for guiding the pressure oil to the actuator in the radial direction of the pin of the swing connection portion in the working machine is formed, the pin itself is one without being divided. Therefore, the bearing for supporting may have a normal configuration, and sufficient durability can be maintained because the pins are not divided even with respect to the load acting on the pins.

[0014]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, a first embodiment of the present invention will be described with reference to FIGS. This drawing shows a configuration in which the working machine is composed of an offset type working link mechanism and a bucket which is a working tool. The working link of the working machine includes a main body (not shown) (for example, a revolving body of a hydraulic shovel). First boom (low boom) 1 attached to the base end side so as to be able to move up and down (possible to elevate) with a horizontal pin
A second boom (upper boom) 3 attached to the tip of the first boom 1 so as to be able to move left and right by means of a vertically placed pin 2, and a vertically movable pin 4 at the tip of the second boom 3 A third boom (offset boom) 5 attached to the
The arm 9 is attached to the arm 7 so as to be able to move up and down (up and down). I have. On the lower surface side of the first boom 1,
A boom cylinder, which is an actuator for driving the boom cylinder, is attached to the main body (not shown).
The bracket 1 provided on one side of the third boom 5 is provided on the bracket 10 provided on one side of the tip of the first boom 1.
1 and a rod 12 is attached in parallel with the second boom 3. An offset cylinder (offset actuator) is attached to a bracket (not shown) provided on the other side of the first boom 1 at the other side surface of the second boom 3. ing. An arm cylinder (arm actuator) 1 having a piston rod distal end connected to a bracket 13 provided on the base end side of the arm 7 is located above the third boom 5.
4 is attached. On the upper surface side of the arm 7, a cylindrical portion is attached to the bracket 13, and a tip end portion of a piston rod is connected to a back portion of the bucket 9 via links 15 and 16 at the tip end portion of the arm 7. Actuator) 17 is provided. The two pipes connected to the boom cylinder are provided from the main body, and the two pipes communicating with the offset cylinder are not shown in the first boom 1.
After being arranged along the upper surface of the second boom 3, the second boom 3 is connected to the offset cylinder side after being bent, and the two pipes 18 and 19 of the arm cylinder 14 and the bucket cylinder 17 are connected to the first boom 1 After being arranged along the upper surface of the first boom 1, it is guided into the second boom 3 through the insertion port 20 provided on the rod 12 side of the tip of the first boom 1, and is radially located at the intermediate portion between the pins 2 and 4. Formed through holes 21 and 22
Through the opening 23 provided at the distal end of the second boom 3 and into the third boom 5, and after being taken out of the third boom 5, the arm 23 is passed through the bracket 13. After that, they are connected to the bucket cylinders 17 respectively.

With the above configuration, the bucket cylinder 17
And pipes 18 and 19 for guiding pressure oil to arm cylinder 14
Through the through holes 21 and 22 in the second boom 3, which are paths for guiding the pressurized oil formed on the pins 2 and 4, so that the pipes 18, which are relatively close to the bucket 9 as the working tool,
Since the pipe 19 is prevented from jumping out of the work machine as much as possible, the pipe is less likely to come into contact with the excavated material during the work. In addition, the number of links of the working machine such as the first to third booms 1, 3, 5, 5 and the arm 7 and the bucket 9 and the number of actuators for driving the link are large, and piping for guiding the pressure oil to the offset cylinder at the time of the offset operation In the case of the offset type working link mechanism in which the amount of deflection of the pin 18 changes, the circumference of the connecting portion of the pin 4 is particularly narrow, so that the path through which the pipe 18 for guiding the pressurized oil to the offset cylinder to the pin 4 itself is provided. By forming the pipe, a space for passing the pipe 18 can be secured, and a change in the amount of deflection of the pipe at the time of the offset operation can be reduced, so that even if the pipe jumps out of the working machine, it is extremely reduced. . Since both pins 2 and 4 are formed by one member as in the case of a general pin, the bearing to be supported is the second boom 3.
, The upper and lower positions are the same as those of the conventional working machine, and the structure of the bearing is not complicated.

Next, a second embodiment of the present invention will be described with reference to FIG. This figure shows a modified example of each pin applied to the positions of the pins 2 and 4 shown in FIG. 1, and other configurations are the same as those in FIG. Four through holes 32 and 33 are formed in the pins 30 and 31 in the radial direction of the intermediate portion, respectively, in parallel with the vertical direction. The two pipes 36 and 37 connected to the arm cylinder 14 and the bucket cylinder 17 via the nipples 34 and 35, respectively, are connected. As described above, even when the through holes 32 and 33 formed in the pins 30 and 31 by using the nipples 34 and 35 are used as paths for directly guiding the pressurized oil, the same operation as in the first embodiment is performed. Further, the size of the through holes 32 and 33 can be set to the minimum necessary hole diameter for passing the pressure oil.

Next, although not shown, other application examples and other modifications will be described below.

In each of the above embodiments, an offset type working link having a relatively large number of working links is taken as an example. However, a plurality of working links constituting a working machine are constituted by at least one of a boom or an arm. A through-hole may be formed in the radial direction of at least one pin connecting the boom or arm and another working link, as a path for guiding pressure oil to an actuator for driving the working link. In this case, Is a general excavator equipped with a boom, an arm, and a bucket, and a more specific example is a hydraulic excavator.

In each of the above embodiments, the pipes 18, 19
And the pipes 36 and 37 are installed inside the second boom 3 from the distal end of the first boom 1.
And the through holes 22 and 33 formed in the pins 4 and 31 on the tip of the second boom 3, that is, the pins 4 and 31 on the tip of the second boom 3 are inserted. Only the through-holes 22 and 33 may be passed through, and after the first boom 1 is internally provided in the same manner as in Japanese Utility Model Publication No. 7-56364 described as the prior art, the second boom shown in each of the above-described embodiments is provided. You may comprise so that the boom 3 may be equipped.

In each of the above embodiments, the pin structure in the working machine is shown. However, since the pin for connecting the working machine to the main body can be similarly configured, for example, the base end of the first boom 1 can be used. By applying a so-called swing type excavator that turns the side in the left and right direction to perform gutter work, etc., the interior of the piping at the swing post part of the main body can be configured without complicating the pin bearing structure Can be.

As a modification of the first embodiment, two through-holes are formed in the radial direction of the pins 2 and 4 in parallel in the vertical direction, and two pipes 18 and 19 are respectively formed as a set. You can pass through. Of course, two pipes 18 or 19
It is also possible to form through holes in the pins 2 and 4 through which the pipes 18 and 19 connected to either the arm cylinder 14 or the bucket cylinder 17 pass.

As a modification of the second embodiment, four through holes 3 formed in the radial direction of the pins 30 and 31 are provided.
The pipes 36 and 37 may be passed through the pipes 2 and 33, respectively.
In this case, the nipples 34 and 35 need not be used, but the diameters of the through holes 32 and 33 need to be large enough to allow the pipes 36 and 37 to pass through.

As described above, pins 2, 4 and 30, 31
By forming the path for guiding the pressure oil to the pin, a path for the pressure oil in a narrow portion around the pin is secured without making the working machine heavy and without complicating the structure. And the bearing which supports the pin which connects the working tool and the working link of the working machine may be supported at two places above and below the pin, which is the same as general pin support, and the structure of the bearing becomes complicated. Nothing.

[0024]

According to the pin structure of the swing connection portion in the working machine of the present invention described above, the through hole serving as a path for guiding the pressure oil to the actuator in the radial direction of the pin of the swing connection portion in the work machine is formed. By forming the pin, the path of the pressure oil to the actuator can be secured to the pin without reducing the strength of the pin as much as possible and without complicating the structure of the bearing that supports the pin.

[Brief description of the drawings]

FIG. 1 is a side view for illustrating a first embodiment of the present invention, showing a configuration in which a working machine includes an offset type working link mechanism and a bucket as a working tool.

FIG. 2 is an enlarged view for explaining a structure of pins 2 and 4 shown in FIG. 1;

FIG. 3 is an explanatory enlarged view illustrating a second embodiment of the present invention and illustrating the structure of pins 30 and 31 replacing pins 2 and 4 of FIG. 1 similarly to FIG. 2;

FIG. 4 is an explanatory perspective view showing a conventional offset hydraulic excavator.

5 is an explanatory side view showing the structure of the work machine of FIG. 4 without piping.

6 is an explanatory top view showing a state where the work machine of FIG. 5 is viewed from above.

FIG. 7 is a cross-sectional view for explaining a working machine of a conventional offset hydraulic excavator, showing a structure centering on a pin connecting portion between a first boom and a second boom, and showing an internal structure of a pipe. is there.

FIG. 8 is an explanatory cross-sectional view related to FIG. 7, showing a structure centering on a pin connection portion between a first boom, a second boom, and a third boom.

FIG. 9 is an explanatory cross-sectional view related to FIG. 7, showing a structure centering on a pin connection portion between a second boom, a third boom, and an arm.

[Explanation of symbols]

 1 1 boom 2 pin 3 2nd boom 4 pin 5 3rd boom 6 pin 7 arm 8 pin 9 bucket 14 arm cylinder 17 bucket cylinder 18 piping 19 piping 21 through hole 22 through hole 30 pin 31 pin 32 pin 32 through hole 33 through hole 34 Nipple 35 Nipple 36 Piping 37 Piping

 ──────────────────────────────────────────────────続 き Continuing from the front page (72) Inventor Kazunori Sukuzawa 650, Kandamachi, Tsuchiura-shi, Ibaraki Prefecture Within Hitachi Construction Machinery Engineering Co., Ltd.

Claims (6)

[Claims] 1. A work machine comprising a work implement, a plurality of work links connected by pins for swinging the work implement, and a plurality of actuators for driving the work implement. A hydraulic working machine pivotally attached to the working machine, wherein a through hole is formed in a radial direction of the pin in the working machine so as to guide pressure oil to an actuator. Pin structure of connection part. 2. A plurality of working links constituting the working machine, each comprising at least one of a boom and an arm, and an actuator is provided in a radial direction of the pin connecting the boom or the arm to another working link. 2. The pin structure of a swing connection part in a working machine according to claim 1, wherein a through-hole serving as a path for guiding the pressurized oil is formed. 3. The swing connection in a working machine according to claim 1, wherein a pipe for guiding pressure oil to an actuator is passed through a through hole formed in a radial direction of the pin in the working machine. Pin structure of the part. 4. A plurality of working links constituting said working machine are offset type working link mechanisms including at least a first boom, a second boom, a third boom and an arm.
A second boom is connected to the first boom swingably attached to the main body so that the second boom can move left and right, a second boom can move left and right, and an arm is connected to the third boom so that the arm can move up and down. Forming at least a through hole in the radial direction of the pin for connecting the second boom and the third boom,
2. The pin structure of a swing connection part in a working machine according to claim 1, wherein a pipe for guiding pressure oil to at least one of an actuator for driving the work implement and an actuator for driving the arm is passed through the through hole. 5. A work machine comprising a work implement, a plurality of work links connected by pins for swinging the work implement, and a plurality of actuators for driving the work implement, the base end of which is a main body. A hydraulic working machine pivotally mounted by a pin on the working machine, wherein a plurality of through holes serving as a path for guiding pressure oil to an actuator are formed in a radial direction of the pin in the working machine. Pin structure of swing connection. 6. A connector for pipe connection is attached to each of the openings of the plurality of through holes formed in the pin, and a pipe for guiding pressure oil to the actuator is attached to the connector. The pin structure of the swing connection part in the work machine according to claim 5, characterized in that: