JP4999591B2 - Piping arrangement structure in the truck frame - Google Patents

Description

  The present invention relates to an arrangement structure of pipes provided in a track frame for supplying pressure oil to a tilt cylinder or the like of a bulldozer.

Conventionally, in construction machines such as bulldozers, working machines such as blades are driven by pressure oil supplied to a hydraulic cylinder. This hydraulic cylinder is supplied with pressure oil that has passed through the track frame through a piping such as a rubber hose from a hydraulic pump installed on the main frame side in order to drive a work machine such as a blade attached to the outside of the track frame. .
For example, in Patent Document 1, a main frame and a track frame are connected by a pivot shaft, and pipe installation openings are provided in the vicinity of the pivot shaft connection portion and in the vicinity of the trunnion of the work machine on the outer surface of the track frame. There is disclosed a bulldozer track frame structure in which a hole is provided and piping for supplying pressure oil via a pipe member or the like is disposed substantially perpendicular to the main frame side from the vicinity of the trunnion.
Japanese Utility Model Publication No. 5-94060 (published on December 21, 1993)

However, the conventional track frame structure has the following problems.
That is, in the track frame structure disclosed in the above publication, piping for supplying pressure oil is installed along the inner surface side of the track frame on the connection side with the main frame, covered with a cover member, and the inner and outer sides of the track frame. These members are installed via a pipe material connected as a unit.

For this reason, there is a problem that the number of parts protecting the pipes and the pipes increases and the configuration becomes complicated.
The subject of this invention is providing the piping arrangement | positioning structure in the track frame which can reduce a number of parts and can simplify a structure, reducing the load concerning piping.

According to a first aspect of the present invention, there is provided a pipe arrangement structure in a track frame of a construction machine to which a working machine driven by a hydraulic cylinder is attached, the pipe arrangement structure in a truck frame, and a first opening portion and a second arrangement structure. An opening and piping are provided. The first opening is formed in the vicinity of the first rotating shaft that connects the main frame and the track frame of the construction machine in a rotatable state. The second opening is formed on the side surface of the track frame in the vicinity of the second rotation shaft that connects the work implement and the track frame in a rotatable state. The piping is arranged so as to connect the first opening and the second opening with the shortest distance.

Here, pipes that supply pressure oil to the hydraulic cylinders that drive the work machine through the main frame connected to the inner and outer surfaces of the track frame and the vicinity of the connection part with the work machine are connected to each connection part. It arrange | positions so that the 1st and 2nd opening part formed in the 1st and 2nd rotating shaft vicinity contained may be tied with the shortest distance.
Here, as the construction machine, a bulldozer, a trimming dozer, or the like equipped with a blade or the like can be considered as a working machine. Further, the pipe includes, for example, a hydraulic pipe that supplies pressure oil to a tilt hydraulic cylinder attached to an outside dozer in the case of a bulldozer. Further, as the first rotating shaft, a pivot shaft connecting the main frame and the track frame can be considered. As the second rotating shaft, a trunnion or the like that attaches a working machine such as a blade to the outer surface of the track frame in a rotatable state can be considered.

  Usually, the pivot shaft (first rotating shaft) and the trunnion (second rotating shaft) attached to both side surfaces of the track frame are arranged at positions shifted in the front-rear direction of the track frame. In the pipe arrangement structure in the track frame according to the present invention, the vicinity of the connection portion with the first rotation shaft corresponding to the pivot shaft or the like and the vicinity of the connection portion with the second rotation shaft corresponding to the trunnion or the like are the shortest distance. The pipes are arranged diagonally so as to connect.

  As a result, even when the track frame or work implement rotates on the first and second rotating shafts, the pipes are affected by the rotation because they are arranged so as to connect the vicinity of the first and second rotating shafts. The amount of movement can be minimized. Compared to the conventional structure in which the pipes are arranged substantially at right angles, for example, it is only necessary to fix one pipe material in the track frame by welding or the like and pass the pipes. Such parts can be reduced. As a result, the configuration can be simplified by reducing the number of parts protecting the pipe while reducing the load on the pipe.

The piping arrangement structure in the track frame according to the second invention is the piping arrangement structure in the track frame according to the first invention, and the first rotating shaft is a pivot shaft. And a 2nd rotating shaft is a trunnion.
Here, as the first and second rotating shafts attached in the vicinity of the first and second openings formed at both ends of the pipe in the track frame, the pivot shaft that connects the main frame and the track frame, In addition, a trunnion that connects a track frame and a work machine (such as an outside dozer) is specified.

  As a result, in a side view of a construction machine such as a bulldozer, even when the pivot shaft and the trunnion are displaced in the front-rear direction of the construction machine, the first formed in the vicinity of the attachment portion to the track frame. -By arranging the piping so that the second openings are connected to each other at the shortest distance, the number of parts protecting the piping can be reduced. For this reason, it is possible to supply pressure oil with a simplified piping arrangement structure to the hydraulic cylinders for tilting the blade and for the pitch through the track frame.

The piping arrangement structure in the track frame according to the third invention is the piping arrangement structure in the track frame according to the first or second invention, and connects the first opening and the second opening at the shortest distance. As described above, a pipe member fixed in the track frame is further provided.
Here, in order to protect the piping arranged to connect the first and second openings in the shortest distance in the track frame, a pipe material is provided so as to connect the first and second openings in the shortest distance. Yes.
Thereby, it is possible to prevent the piping from being damaged in the track frame and to easily perform the operation of passing the piping through the first and second openings along the pipe material.

  The piping arrangement structure in the track frame according to the fourth invention is the piping arrangement structure in the track frame according to the third invention, and the pipe material is fixed to the track frame by welding.

Here, the pipe material installed so as to connect the first and second openings in the track frame is fixed to the track frame by welding.
Thereby, the connection part of a pipe material and a track frame can be firmly fixed without a gap. As a result, even when earth and sand flows around the track frame, the earth and sand can be prevented from entering the inside of the truck frame.

The pipe arrangement structure in the track frame according to the fifth invention is the pipe arrangement structure in the track frame according to the third or fourth invention, and the second opening is formed to be elliptical. Yes.
Here, for example, the second opening formed in the vicinity of the trunnion on the connection side with the work machine is formed to have an elliptical shape.

Here, since the first opening and the second opening are arranged so as to be connected at the shortest distance, the pipe material having a substantially circular cross section arranged obliquely in the track frame is connected to the track frame. On the surface, it has an elliptical shape.
Thereby, the clearance gap in the connection part of the pipe material with respect to a track frame can be eliminated by making the 2nd opening part into an elliptical shape according to the connection part with a pipe material. As a result, it is possible to prevent soil and sand from entering the track frame, which is a part of the undercarriage exposed to the outside of the construction machine.

  According to the piping arrangement structure in the track frame according to the present invention, the number of parts can be reduced and the configuration can be simplified.

A bulldozer (construction machine) 1 that employs a piping arrangement structure in a track frame according to an embodiment of the present invention will be described below with reference to FIGS.
[Configuration of the entire bulldozer 1]
The bulldozer 1 according to the present embodiment is a construction machine that performs leveling work on rough terrain, and mainly includes a cab 2, a vehicle body frame 3, a work implement 6, and a traveling device 7, as shown in FIG.

The cab 2 is provided with an operator seat for a driver to sit on, a lever for various operations, a pedal, instruments, and the like. The cab 2 is configured by a floor frame (not shown) at the bottom, and pillars and side plates are placed on the floor frame.
The work frame 6 and the traveling device 7 are attached to the body frame 3, and the cab 2 is placed on the upper part thereof. Further, the body frame 3 is provided with an engine (not shown) and the like therein, and the rotational driving force generated in the engine is transmitted to the sprocket 73 of the traveling device 7 described later via the final reduction gear 35. The The internal structure of the vehicle body frame 3 will be described in detail later.

  As shown in FIG. 1, the work machine 6 is a mechanism for scraping the ground and carrying the earth and sand, and includes a blade 60, a support frame 61, a tilt cylinder (hydraulic cylinder) 62, and a lift cylinder 63. Have. The blade 60 is provided in front of the vehicle body frame 3 and has a plate shape with a curved front surface. One end of the support frame 61 is fixed to the blade 60, and the other end is attached to the track frame 71 of the traveling device 7. The support frame 61 supports the blade 60 from the track frame 71 side while being rotatable about the trunnion (second rotation shaft) 52 of the track frame 71. The tilt cylinder 62 expands and contracts by the pressure oil supplied from the track frame 71 through the support frame 61 to adjust the angle of the blade 60. The lift cylinder 63 adjusts the height position of the blade 60 by expanding and contracting as necessary during leveling work or the like. The arrangement structure in the track frame 71 of the tilt pipe (pipe) 53 that supplies pressure oil to the tilt cylinder 62 will be described in detail later.

The traveling device 7 includes a crawler belt P, a pair of left and right track frames 71 disposed along the longitudinal direction of the vehicle, an idler 72 that is a traveling wheel, a sprocket 73, and the like. The traveling device 7 is provided at each of the left and right lower portions of the vehicle body frame 3 and is capable of traveling on rough terrain by winding an endless crawler belt P.
[Configuration of inside and around track frame 71]
Here, the arrangement structure of the tilt pipes 53 in and around the track frame 71 will be described with reference to FIGS. The track frames 71 are provided in a substantially common configuration, one on each of the left and right sides of the main frame 70. Here, the track frame 71 provided on the left side of the main frame 70 will be described as an example. .

  The tilt pipe 53 of the present embodiment is formed of a rubber-based material such as butadiene rubber, and supplies pressure oil to adjust the angle of the blade 60 of the work machine 6. Then, the tilt pipe 53 is configured so that the pressure oil fed from a hydraulic pump (not shown) is supplied from the main frame 70 to the tilt cylinder 62 via the track frame 71 and the support frame 61 as shown in FIGS. To send.

  More specifically, as shown in FIGS. 3 and 4, the tilt pipe 53 includes a first opening 71 a and a second opening 71 b formed on the left and right side surfaces of the track frame 71 from the main frame 70 side. Through the track frame 71 obliquely. Then, it passes through the support frame 61 and is connected to the tilt cylinder 62 through a connection portion (trunnion 52) with the work machine 6 attached to the outer side surface of the track frame 71.

That is, in the track frame 71, in order to dispose the tilt pipe 53 to the tilt cylinder 62, the first opening 71a and the second opening 71b are respectively formed on the left and right side surfaces. A pipe member 55 is provided so as to connect the first and second openings 71a and 71b formed on the left and right side surfaces of the track frame 71 with the shortest distance.
As shown in FIGS. 4 and 5, the first opening 71 a is a through hole formed in the side surface of the track frame 71 facing the main frame 70. The first opening 71a is formed in the vicinity of a pivot shaft (first rotating shaft) 51 that connects the main frame 70 and the track frame 71 in a relatively rotatable state. The pivot shaft 51 serves as a rotation center when the track frame 71 rotates relative to the main frame 70 separately on the left and right when the bulldozer 1 rides on an obstacle such as a rock while the bulldozer 1 is traveling. Therefore, even when the track frame 71 rotates with respect to the main frame 70, the amount by which the tilt pipe 53 arranged across the main frame 70 and the track frame 71 is pulled can be minimized.

  As shown in FIGS. 4 and 6, the second opening 71 b is a through hole formed in the side surface of the track frame 71 on the connection side with the support frame 61 of the work machine 6. The second opening 71b is formed so as to pass through a trunnion (second rotation shaft) 52 for attaching the support frame 61 to the track frame 71 in a rotatable state. The trunnion 52 becomes the center of rotation of the support frame 61 of the work implement 6 when the lift cylinder 63 shown in FIG. 1 is driven to move the work implement 6 up and down in the height direction. For this reason, even when the work implement 6 is moved up and down in the height direction around the trunnion 52 by the lift cylinder 63, the amount by which the tilt pipe 53 is pulled can be minimized. Furthermore, the second opening 71b is formed so that a cross section, which will be described later, becomes an elliptical shape in accordance with the shape of the connection portion with the pipe member 55 having a substantially circular diameter. Thereby, intrusion of earth and sand into the track frame 71 can be avoided by attaching the pipe material 55 to the inner surface side of the track frame 71 without a gap at a connection portion with the pipe material 55.

  As shown in FIG. 4 and the like, the pipe material 55 is formed of a steel pipe having a substantially circular cross section. By passing the tilt pipe 53 through the hollow portion inside, the pipe 55 is damaged in the track frame 71. It is preventing. In addition, the pipe material 55 is fixed by welding at a connection portion with the second opening 71 b formed in the trunnion 52 that is on the connection side with the work machine 6. Thereby, the pipe material 55 can be firmly fixed to the inner surface side of the track frame 71 without a gap at a connection portion with the second opening 71 b formed in an elliptical shape.

<Flow of installation process of tilt pipe 53>
Here, the process of installing the tilt pipe 53 described above in the track frame 71 will be described.
First, the pipe material 55 is fixed to the inside of the track frame 71 in which the first and second openings 71a and 71b are formed on the left and right side surfaces by welding.

Next, the tilt pipe 53 is inserted from one end of the pipe member 55 fixed to the track frame 71 to the other end.
Next, the pipe cover 75 (see FIGS. 3 and 4) is attached to the first opening 71a formed on the side surface on the main frame 70 side.
Next, the end of the tilt pipe 53 disposed so as to penetrate the track frame 71 to the left and right is connected to the pipe on the main frame 70 side.

Next, the left and right track frames 71 are attached to the left and right side surfaces of the main frame 70 at the pivot shaft 51.
Finally, the support frame 61 of the work machine 6 is attached to each of the trunnion 52 portions outside the track frame 71.
In the arrangement structure of the tilt pipe 53 in the track frame 71 of the present embodiment, the pipe material 55 is fixed in the track frame 71 and then assembled through the tilt pipe 53 as described above.

Accordingly, when the tilt pipe 53 is installed so as to pass through the first and second openings 71 a and 71 b formed on the left and right side surfaces of the track frame 71 and penetrate the track frame 71, Since it is only necessary to insert the tilt pipe 53 from the end of this, workability is improved.
Further, in order to install the tilt pipe 53 so as to connect the first and second openings 71 a and 71 b with the shortest distance, the pipe material 55 is disposed obliquely in the track frame 71.

Accordingly, even when the tilt pipe 53 is disposed so as to penetrate the track frame 71, the tilt pipe 53 can be smoothly installed because there is no portion that bends at right angles.
[Features of Arrangement Structure of Tilt Pipe 53 in Track Frame 71]
(1)
In the arrangement structure of the tilt pipes 53 in the track frame 71 of the present embodiment, as shown in FIG. 4, the first opening 71a and the second opening 71b are formed on the left and right side surfaces of the track frame 71, respectively. Has been. The first opening 71 a is formed in the vicinity of the pivot shaft 51 on the side surface facing the main frame 70. The second opening 71 b is formed in the vicinity of the trunnion 52 on the side surface of the work machine 6 on the connection side with the support frame 61. The tilt pipe 53 that supplies pressure oil to the tilt cylinder 62 that drives the work machine 6 is disposed so as to connect the first and second openings 71a and 71b with the shortest distance.

  As a result, the tilt pipe 53 is installed so as to pass through the vicinity of the pivot shaft 51 and the trunnion 52, which are rotating shafts attached to the left and right side surfaces of the track frame 71, respectively. Thus, even when the main frame 70 and the work implement 6 are relatively rotated, the amount by which the tilt pipe 53 is pulled can be minimized.

  Further, in the present embodiment, the tilt pipe 53 is arranged so as to connect the first and second openings 71a and 71b formed on both side surfaces of the track frame 71 with the shortest distance. Therefore, after the tilt pipe 53 is arranged along the longitudinal direction of the track frame 71, the configuration is reduced by reducing the number of parts as compared with the conventional configuration in which the tilt pipe 53 is bent at a substantially right angle and passed through the track frame 71. It can be simplified.

(2)
In the arrangement structure of the tilt pipes 53 in the track frame of the present embodiment, as shown in FIG. 4 and the like, the first and second rotating shafts attached to the left and right side surfaces of the track frame 71 are pivot shafts on the main frame 70 side. 51, trunnions 52 are provided on the support frame 61 side of the work implement 6 respectively.

Thereby, for example, even when the support frame 61 is rotated around the trunnion 52 when the work machine 6 is driven, the tilt pipe 53 disposed so as to pass through the support frame 61 is pulled and damaged. Can be avoided.
(3)
In the arrangement structure of the tilt pipe 53 in the track frame of the present embodiment, as shown in FIG. 4 and the like, the pipe material 55 is attached along the portion in the track frame 71 where the tilt pipe 53 is installed.

Accordingly, the tilt pipe 53 can be protected by preventing the tilt pipe 53 from being damaged as a result of exposing the tilt pipe 53 in the track frame 71.
(4)
In the arrangement structure of the tilt pipes 53 in the track frame of the present embodiment, the pipe material 55 is fixed to the track frame 71 by welding as shown in FIGS.

Thereby, the connection part of the pipe material 55 and the track frame 71 can be firmly connected without a gap. As a result, it is possible to prevent intrusion of earth and sand from the connecting portion between the pipe material 55 and the track frame 71.
(5)
In the arrangement structure of the tilt pipes 53 in the track frame 71 according to the present embodiment, as shown in FIG. 4 and the like, the connection portion of the track frame 71 on the connection side with the work machine 6 is in an elliptical shape. The 2nd opening part 71b is formed so that it may become.

Thereby, in the connection part with the pipe material 55 which has a cross section of a substantially circular diameter, the welding connection of the pipe material 55 and the track frame 71 can be performed without gap. As a result, in the track frame 71, it is possible to surely prevent the intrusion of the earth and sand into the track frame 71 from both outer surfaces where the earth and sand easily enter.
[Other Embodiments]
As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment, A various change is possible in the range which does not deviate from the summary of invention.

(A)
In the above-described embodiment, the example in which the pipes arranged in the track frame 71 are arranged inside the pipe material 55 has been described. However, the present invention is not limited to this.
For example, piping may be installed in the track frame without using pipe material.
However, considering problems such as damage to the piping in the track frame, it is preferable to install the piping so as to be covered with a pipe material or the like as in the above embodiment.

(B)
In the above embodiment, an elliptical opening (second opening 71 b) is provided at a connection portion between the pipe material 55 for protecting the pipe disposed in the track frame 71 and the outer surface of the track frame 71. The example formed was explained. However, the present invention is not limited to this.

For example, when the cross-sectional shape of the pipe material is a square, the shape of the opening formed in the connection portion may be set according to the shape of the pipe material, such as forming a rectangular opening.
(C)
In the above-described embodiment, an example in which the substantially elliptical second opening 71 b is formed only in the connection portion between the pipe material 55 for protecting the pipe disposed in the track frame 71 and the outer surface of the track frame 71. And explained. However, the present invention is not limited to this.

For example, a substantially elliptical opening may be formed at the connection portion between the inner surface of the track frame and the pipe material.
In this case, it is possible to prevent entry of foreign matter or the like from the inside of the track frame.
(D)
In the above embodiment, the opening (first and second openings 71a, 71b) is formed on the inner and outer side surfaces of the track frame 71, and the tilt pipe 53 is disposed so as to pass through these openings. And explained. However, the present invention is not limited to this.

For example, when the connection portion between the work machine and the track frame is on the upper surface of the track frame, the piping is installed from the opening formed on the inner surface of the track frame through the opening formed on the upper surface. You may do it.
(E)
In the above embodiment, an example in which the piping arrangement structure in the track frame 71 according to the present invention is applied to the arrangement structure of the tilt piping 53 of the bulldozer 1 has been described. However, the present invention is not limited to this.

  For example, the present invention can be similarly applied to a pipe arrangement structure mounted on a track frame of another construction machine, such as a pitch pipe of a trimming dozer.

  Since the pipe arrangement structure in the track frame of the present invention has the effect of reducing the number of parts protecting the pipe while reducing the load on the pipe, the construction can be simplified. The present invention can be widely applied to the arrangement structure of the pipes installed in.

The side view which shows the external appearance of the bulldozer by which the piping arrangement | positioning structure in the track frame which concerns on one Embodiment of this invention was employ | adopted. FIG. 2 is an external view showing a configuration around a track frame included in the bulldozer of FIG. 1. Sectional drawing which shows arrangement | positioning of the tilt piping in the track frame of FIG. FIG. 4 is an enlarged cross-sectional view showing the arrangement of tilt pipes in the track frame of FIG. 3. The figure which shows the piping arrangement | positioning structure by the side of the main frame in the track frame of FIG. The figure which shows the piping arrangement | positioning structure by the side of the main frame in the track frame of FIG.

Explanation of symbols

1 Bulldozer (construction machine)
2 Cab 3 Body frame 6 Working machine 7 Travel device 35 Final reduction device 51 Pivot shaft (first rotation shaft)
52 trunnion (second rotary shaft)
53 Tilt piping (Piping)
55 Pipe material 60 Blade 61 Support frame 62 Tilt cylinder (hydraulic cylinder)
63 Lift cylinder 70 Main frame 71 Track frame 71a First opening 71b Second opening 72 Idler 73 Sprocket 75 Piping cover P Track

Claims (5)

A piping arrangement structure in a truck frame of a construction machine to which a working machine driven by a hydraulic cylinder is attached,
A first opening formed in the vicinity of a first rotating shaft for connecting the main frame of the construction machine and the track frame in a rotatable state;
A second opening formed on a side surface of the track frame in the vicinity of a second rotating shaft that connects the working machine and the track frame in a rotatable state;
The piping arranged to connect the first opening and the second opening at the shortest distance;
Piping arrangement structure in a truck frame equipped with. The first rotation axis is a pivot shaft,
The second rotation axis is a trunnion;
The piping arrangement structure in the track frame according to claim 1. A pipe member fixed in the track frame so as to connect the first opening and the second opening at the shortest distance;
The piping arrangement structure in the track frame according to claim 1 or 2. The pipe material is fixed to the track frame by welding,
The piping arrangement structure in the track frame according to claim 3. The second opening is formed to be elliptical.
The piping arrangement structure in the track frame according to claim 3 or 4.

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