JPH07238569A - Hydraulic shovel - Google Patents

Abstract

PURPOSE:To constitute such a hydrulic shovel having excellent beauty, compact efficiency, work efficiency, protective efficiency of a piping cover and maintenance of pressure oil supply pipes by devising the constitution of a protection cover of the pressure oil supply pipes and a protection cover mounting section. CONSTITUTION:A sectional shape of a boom 3 is so formed that it is a frame shape formed in a square or the like, at least one side of a lower plate 3a thereof is projected outward from the outside of one side plate 3b and that pressure oil supply pipes 3-26 are piped along the outside of one side plate 3b. The circumference of the pressure oil supply pipes is covered with a piping cover 51 fromed in the shape not projected to the outside from the lower plate mentioned above. An upper plate 3c of the boom can be also projected in the same direction. The piping cover can be projected to the outside from one side of the lower plate 3a.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic excavator,
In particular, the present invention relates to the shape of the boom and the mounting structure of the pipe cover for protecting the pressure oil supply pipe that is piped along the boom.

[0002]

2. Description of the Related Art A hydraulic excavator comprises a traveling body, a revolving body rotatably mounted on the traveling body, a boom rotatably pin-connected to the revolving body, and a rotating body with respect to the boom. An arm that is pin-connectable, a bucket that is rotatably pin-connected to the arm, a boom hydraulic cylinder that drives the boom, an arm hydraulic cylinder that drives the arm, and the bucket. It is mainly composed of a hydraulic cylinder for a bucket to be driven. On the revolving structure, a hydraulic pressure generating device including a prime mover and a hydraulic pump driven by the prime mover is mounted, and an operation lever group for controlling the operation of each hydraulic cylinder is arranged. A separate cab is provided. The hydraulic pressure generator and each hydraulic cylinder are connected via a pressure oil supply pipe that is arranged along the side surface of the boom, and the amount and direction of the pressure oil flowing through the pressure oil supply pipe are determined by the operating lever. The desired work such as excavation is performed by selectively operating the boom, the arm, and the bucket under the control of.

By the way, in a large hydraulic working machine such as a hydraulic excavator, aesthetic superiority or compactness is not a problem so far, and the pressure oil supply pipe is exposed, that is, visible from the outside. Often piped. However, in recent years, due to the improvement of living standards and the accompanying increase in aesthetic sense, it is not enough for a construction machine to be merely functionally superior, and it is now required to have an excellent aesthetic appearance. This tendency is particularly strong in compact and elegantly shaped hydraulic excavators used in urban areas and residential areas.

In order to meet such demands, hydraulic excavators having a aesthetic appearance improved by piping the pressure oil supply pipe so as not to be seen from the outside have been conventionally provided on the market. Figure 11
Is the first of the conventional piping methods for the pressure oil supply pipe.
FIG. 3 is a diagram showing an example, in which a plurality of pressure oil supply pipes 62 are pierced inside a boom 61 having a quadrangular or similar frame cross section. FIG. 12 is a view showing a second example of the side plate 6 that constitutes the boom 61.
A pressure oil supply pipe 62 is fixedly mounted on the outer surface of 1a via a fixture 63, and the periphery thereof is covered with a pipe cover 64.

[0005]

DISCLOSURE OF THE INVENTION Problems to be Solved by the Invention
In the former of the types of piping methods, since the pressure oil supply pipe 62 is penetrated into the boom 61, it is difficult to inspect, repair, or replace the pressure oil supply pipe 62, and the ease of maintenance deteriorates. There is inconvenience. On the other hand, in the latter, since the pressure oil supply pipe 62 and the pipe cover 64 are attached to the outer surface of the boom 61, the work must be performed with care so that the pipe cover 64 does not collide with earth and sand. In a hydraulic excavator of a type that is poor in performance and the operator can see the pipe cover 64 only obliquely from below the boom 61 on the side opposite to the pipe cover mounting surface, the pipe cover 64 is hidden behind the boom 61 depending on the work. Therefore, the pipe cover 64 is liable to be damaged accidentally during work, and in the worst case, the pressure oil supply pipe 6
There is a risk of damage up to 2. In particular, in an offset type hydraulic excavator including a first boom pin-connected to the revolving structure and a second boom pin-movably laterally movable to the first boom by an offset cylinder, When the two booms are offset, the pipe cover 64 easily collides with the earth and sand in the excavated portion, so that the above-mentioned inconvenience is likely to occur.

The present invention solves the disadvantages of the prior art and provides a hydraulic excavator which is excellent in aesthetics, compactness, workability, and protection of the pipe cover, and which can easily maintain the pressure oil supply pipe. To aim.

[0007]

In order to achieve the above-mentioned object, the present invention provides a traveling body, a revolving structure on which a hydraulic pressure generator is mounted, and a boom rotatably pin-connected to the revolving structure. An arm pivotably connected to the boom, a bucket pivotably connected to the arm, a boom hydraulic cylinder for driving the boom, and an arm for driving the arm. Hydraulic cylinder, a bucket hydraulic cylinder that drives the bucket, and a pressure oil supply pipe that is piped along the outer surface of the boom and that supplies pressure oil from the hydraulic pressure generator to the hydraulic cylinders.
In a hydraulic excavator including a pipe cover that protects the pressure oil supply pipe, the lower plate of the boom is formed in a shape in which at least one side of the boom protrudes outward from the outer surface of one of the side plates. The pressure oil supply pipe is arranged along the outer surface of the side plate on the side where the lower plate projects, and the periphery of the pressure oil supply pipe is covered with a pipe cover.

The boom is formed in a quadrilateral shape or a frame shape similar to this, and at least one side of the lower plate thereof projects outwardly from the outer surface of one side plate. be able to. Further, in order to ensure the protection of the pipe cover, the amount of protrusion of the lower plate may be equal to or more than the amount of protrusion of the pipe cover. Furthermore, in order to enhance the protection effect of the pipe cover,
Not only the lower plate of the boom but also the upper plate thereof can be protruded outward at one side from the outer surface of the side plate to which the pressure oil supply pipe is attached. Further, the mounting method and the mounting position of the piping cover can be appropriately changed as necessary, but in order to simplify the configuration and facilitate the mounting and dismounting work, at least one side of the piping cover is It is preferable to be detachably fastened to the upper surface of the lower plate constituting the boom.

The present invention is of course effective for a general type hydraulic excavator provided with one boom integrally formed, but when it is applied to the offset type hydraulic excavator where the pipe cover easily collides with earth and sand. Especially effective.

[0010]

[Operation] If the pressure oil supply pipe is arranged along the outer surface of the side plate that constitutes the boom and the periphery of the boom is covered with the pipe cover, the pressure oil supply pipe will not be directly visible. It can be elegant and compact. Also, if the pipe cover is detachably fixed to the boom by, for example, bolt fastening, the pressure oil supply pipe can be easily inspected, repaired, or replaced by removing the pipe cover, which makes maintenance easy. Not harmed. Further, if the lower plate of the boom is projected outward from the outer surface of the side plate on which the pressure oil supply pipe is piped, even if the pipe cover cannot be visually recognized, it is easy to estimate the position of the pipe cover with respect to the earth and sand, etc. It is possible to effectively prevent collision of dirt and the like on the pipe cover during work, and prevent deformation of the pipe cover and damage to the pressure oil supply pipe. Therefore, it is possible to provide a hydraulic excavator excellent in aesthetic appearance, compactness, workability, and protection of the pipe cover, while hardly impairing the ease of maintenance.

[0011]

EXAMPLES An example of a hydraulic excavator according to the present invention will be described below.
A description will be given based on FIGS. 1 to 10. 1 is a side view of a hydraulic excavator according to an embodiment, FIG. 2 is an exploded perspective view of a boom and a pressure oil supply pipe, FIG. 3 is a perspective view of a first pipe fitting, and FIG. 4 is a second pipe fitting. FIG. 5 is a sectional view of the first boom, FIG. 6 is an exploded perspective view of the boom and the pipe cover, FIG. 7 is a sectional view of the second boom, and FIG. 8 is a plan view showing a state during excavation work. FIG. 9 is a sectional view of a first boom and a second boom according to another embodiment, and FIG. 10 is a sectional view of a first boom and a second boom according to still another embodiment.

In FIG. 1, 1 is a traveling body, 2 is a revolving body,
Reference numeral 3 is a first boom vertically connected to the revolving structure 2 by a pin, 4 is a second boom vertically connected to the tip of the first boom 3, and 5 is vertically moved at a tip of the second boom 4. An arm which is pin-connected so as to be possible, and 6 is a bucket which is pin-movably connected to the tip of the arm 5 so as to be movable up and down, and a front portion for working by these both booms 3, 4 and the arm 5 and the bucket 6. Make up 7. 8 is a boom cylinder that drives the first boom 3, 9 is an offset cylinder that drives the second boom 4, 10 is an arm cylinder that drives the arm 5, 11 is a bucket cylinder that drives the bucket 6, and each of these Hydraulic cylinders 8, 9, 10, 11
Is operated by pressure oil supplied from a hydraulic pressure generator (not shown) mounted on the revolving structure 2. That is, by operating the operation lever 13 arranged in the operator's cab 12 to control the amount and the flow direction of the pressure oil supplied from the oil pressure generator, the hydraulic cylinder corresponding to the operated operation lever is operated. It is operated at a speed according to the operation amount of the lever.

The pressure oil is supplied from the hydraulic pressure generator to each hydraulic cylinder through a pressure oil supply pipe. In FIG. 2, the first
2 shows the configuration of a pressure oil supply pipe that is connected to the second booms 3 and 4. As is apparent from this figure, the first boom 3 is provided with three pressure oil supply pipes 21 to 26, which are three systems connected to the offset cylinder 9, the arm cylinder 10, and the bucket cylinder 11, and the second boom. In boom 4,
Two systems connected to the arm cylinder 10 and the bucket cylinder 11, a total of four pressure oil supply pipes 33 to 36 are attached.

The pressure oil supply pipes 21 to 26 are mounted on the outer surface of the first boom 3 by a mounting tool 41. Fixture 41
As shown in an enlarged view in FIG. 3, the holding member 41 in which the tube storage recesses 41a are formed in parallel to each other, and the bolt through holes 41b are formed in the portions other than the tube storage recesses 41a.
c and a bolt 41d that fastens the bolt to the first boom 3, and sandwiches the pressure oil supply pipes 21 to 26 with the housing recess 41a of the pipe and the outer surface of the first boom 3, and penetrates the bolt through hole 41b. And is detachably fixed by a bolt 41d screwed to the first boom 3. Of the pressure oil supply pipes 21 to 26 attached to the outer surface of the first boom 3, the pressure oil supply pipes 21 and 22 for the offset cylinder 9 pass from one side surface of the first boom 3 to below the lower plate. It is turned to the other side surface side and connected to the offset cylinder 9 via the extension pipes 27 and 28.

The pressure oil supply pipes 33 to 36 are attached to the outer surface of the second boom 4 by the attachments 42. Fixture 42
As shown in an enlarged view in FIG. 4, a frame-shaped holding member 42a having through holes that can individually penetrate the four tubes and a bolt through hole 42b are opened, and are integrated with the holding member 42a. It consists of a fixed member 42c configured and a bolt 42d that fastens the fixed member 42c to the second boom 4, and penetrates the four pressure oil supply pipes 33 to 36 in the through holes formed in the holding member 42a. Bolt through hole 4 formed in the fixing member 42c
A bolt 42d that penetrates 2b and is screwed into the second boom 4
It is detachably fixed at. Of the pressure oil supply pipes 33 to 36 attached to the outer surface of the second boom 4, the pressure oil supply pipes 33 and 34 for the arm cylinder 10 have one end attached to the first arm 3 as the pressure oil supply pipe for the arm cylinder. It is connected to the supply pipes 23 and 24, and the other end is connected to the arm cylinder 10 via the connection member 37 and the extension pipes 38 and 39.
Further, the pressure oil supply pipes 35, 36 for the bucket cylinder 11
Has one end connected to the pressure oil supply pipes 25 and 26 for the bucket cylinder attached to the first arm 3, and the other end connected to the bucket cylinder 11 (not shown) via the distributor 40.

As shown in FIG. 5, the first boom 3 has a quadrilateral cross section or a frame shape similar to this, and one side of the lower plate 3a has pressure oil supply pipes 21 to 21. It is formed in a shape projecting outward from the outer surface of the one side plate 3b to which 26 is attached. As shown in FIGS. 5 and 6, the pipe cover 51 attached to the first boom 3 is
It is composed of a cover portion 51b having a bolt through hole 51a formed therein and an abutting portion 51c formed by erecting both side edges of the cover portion 51b in the same direction, and the total height H ₁ thereof is the protruding amount S _{1 of the} lower plate 3a. Is formed smaller than. As shown in FIG. 5, the pipe cover 51 is attached so as to cover the pressure oil supply pipes 23 to 26, and is detachably fixed by a bolt 52 penetrating the bolt through hole 51a and screwed into the side plate 3b. To be done.

As shown in FIG. 7, the second boom 4 also has a quadrilateral cross section or a frame shape similar to this, and one side of the lower plate 4a has pressure oil supply pipes 33 to 33. 36 is formed in a shape protruding outward from the outer surface of the one side plate 4b to which 36 is attached. The pipe cover 53 attached to the second boom 4 is, as shown in FIGS. 6 and 7,
A flat cover portion 53a, the both sides of the cover portion 53a becomes in the standing in the same direction, and consists of the fixed portion 53c and the bolt through holes 53b are opened at predetermined intervals, the overall height H ₂ is It is formed to be smaller than the protruding amount S ₂ of the lower plate 4a. As shown in FIG. 7, the pipe cover 53 is attached so as to cover the pressure oil supply pipes 33 to 36 and is formed on one side of the lower plate 4a protruding from the side plate 4b and on the side plate 4b. It is detachably fixed to the mounting portion 4c with a bolt 52.

Reference numerals 54 and 55 in FIG. 6 denote third and fourth pipe covers, respectively, which cover and protect the pressure oil supply pipe exposed near the tip of the second arm 4. Regarding the third and fourth piping covers 54 and 55, the second
Even if it projects from the outer surface of the arm 4, there is no practical problem.

The hydraulic excavator of this embodiment has the first and second hydraulic excavators.
Since the pressure oil supply pipes 21 to 26 and 33 to 36 are piped along the outer surfaces of the side plates 3b and 4b constituting the booms 3 and 4, and the periphery thereof is covered with the pipe covers 51, 53, 54 and 55, The exposed portion of the pressure oil supply pipe can be reduced, and the appearance of the hydraulic excavator can be made elegant and compact.
Further, since these pipe covers are fastened to the booms 3 and 4 by bolts, these pipe covers can be easily removed from the booms 3 and 4 as needed, and maintenance can be performed easily. Furthermore, since the lower plates 3a and 4a of the booms 3 and 4 protrude outward from the outer surfaces of the side plates 3b and 4b on which the pressure oil supply pipes 21 to 26 and 33 to 36 are arranged, as shown in FIG. Even if the piping covers 51 and 53 cannot be visually recognized directly because the booms 3 and 4 are viewed from diagonally below, it is easy to estimate the positions of these piping covers with respect to the sediment, and the collision of the sediments with these piping covers. Can be effectively prevented, so that excavation work can be performed accurately and efficiently, and damage to the pipe cover and hence the pressure oil supply pipe can be prevented. In addition, since the pipe covers 51 and 53 are formed so as not to project outward from the side end portions of the lower plate,
When the booms 3 and 4 are lowered and offset, collision of dirt and the like on the pipe cover can be effectively prevented, and deformation of the pipe cover and damage to the pressure oil supply pipe can be prevented. Therefore, it is possible to provide a hydraulic excavator excellent in aesthetic appearance, compactness, workability, and protection of the pipe cover, while hardly impairing the ease of maintenance.

The gist of the present invention is that the lower plate of the boom is
It is at a point of projecting outward from the outer surface of the side plate to which the pressure oil supply pipe is attached, and the shapes of the boom and the pipe cover, the arrangement of the pressure oil supply pipe, and the like are not limited to the above-mentioned embodiment. Absent. Other examples of the present invention will be listed below.

As shown in FIG. 9, the lower plate 3a of the boom 3 is used.
Not only the upper plate 3c but also one side of the upper plate 3c can be projected outward from the outer surface of the side plate 3b to which the pressure oil supply pipes 21 to 26 are attached. By doing so, the effect of protecting the pipe cover can be further enhanced. Of course, the second boom 4 can be similarly configured.

As shown in FIG. 10, the lower plate 3 of the boom 3 is
It is also possible to project the left and right sides of a to the outside from the outer surface of each side plate 3b, 3d, and distribute the pressure oil supply pipes to the outer surface of each side plate. Of course, both left and right sides of the lower plate and the upper plate of the boom can be projected outward from the outer surface of each side plate.
Also, the second boom 4 can be configured in the same manner.

In each of the above-described embodiments, the so-called offset type hydraulic excavator has been described as an example, but the present invention can be applied to a normal hydraulic excavator having one boom and an arm connected to the boom as constituent elements.

In each of the above-described embodiments, the boom has a quadrilateral or a similar frame shape in cross section, but may have any other shape.

In each of the above embodiments, the amount of protrusion of the lower plate is made larger than the amount of protrusion of the pipe cover, but the amount of protrusion of the lower plate can be made equal to the amount of protrusion of the pipe cover,
The amount of protrusion of the lower plate can be made smaller than the amount of protrusion of the pipe cover.

[0026]

As described above, according to the present invention,
The pressure oil supply pipe was piped along the outer surface of the side plate that constitutes the boom, and the surrounding area was covered with the pipe cover, so the exposed part of the pressure oil supply pipe could be reduced, and the appearance of the hydraulic excavator was elegant and It can be made compact. Further, since each of these pipe covers is bolted to the boom, these pipe covers can be easily removed from the boom as needed, and maintenance can be performed easily.
Also, since the bottom plate of the boom projects outward from the outer surface of the side plate where the pressure oil supply pipe is piped, even if you cannot see the pipe cover directly because you are looking at the boom obliquely from below, earth and sand etc. Since it is easy to estimate the position of these pipe covers with respect to the pipe cover, and it is possible to effectively prevent the collision of soil and sand on these pipe covers, excavation work can be performed accurately and efficiently, and damage to the pipe cover and thus the pressure oil supply pipe can be prevented. Can be prevented. Therefore, it is possible to provide a hydraulic excavator excellent in aesthetic appearance, compactness, workability, and protection of the pipe cover, while hardly impairing the ease of maintenance.

[Brief description of drawings]

FIG. 1 is a side view of a hydraulic excavator according to an embodiment.

FIG. 2 is an exploded perspective view of a boom and a pressure oil supply pipe.

FIG. 3 is a perspective view of a first pipe fitting.

FIG. 4 is a perspective view of a second pipe fitting.

FIG. 5 is a sectional view of the first boom.

FIG. 6 is an exploded perspective view of a boom and a pipe cover.

FIG. 7 is a sectional view of a second boom.

FIG. 8 is a plan view showing a state during excavation work.

FIG. 9 is a cross-sectional view of a first boom and a second boom according to another embodiment.

FIG. 10 is a first boom and a second boom according to still another embodiment.
It is sectional drawing of a boom.

FIG. 11 is a cross-sectional view showing a first example of a conventionally proposed piping method for a pressure oil supply pipe.

FIG. 12 is a cross-sectional view showing a second example of a conventionally proposed piping method for a pressure oil supply pipe.

[Explanation of symbols]

 1 Traveling Body 2 Revolving Body 3 First Boom 3a Lower Plate 3b Side Plate 4 Second Boom 4a Lower Plate 4b Side Plate 5 Arm 6 Bucket 8 Boom Cylinder 9 Offset Cylinder 10 Arm Cylinder 11 Bucket Cylinder 21-26, 33-36 Pressure Oil Supply Pipes 51, 53, 54, 55 Piping covers

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Manabu Ogasawara 650, Kazunachi-cho, Tsuchiura-shi, Ibaraki Hitachi Construction Machinery Co., Ltd. Tsuchiura Plant

Claims (6)

[Claims] 1. A traveling body, a revolving structure on which a hydraulic pressure generating device is mounted, a boom rotatably pin-connected to the revolving structure, and an arm rotatably pin-connected to the boom. A bucket that is rotatably pin-connected to the arm, a boom hydraulic cylinder that drives the boom, an arm hydraulic cylinder that drives the arm, and a bucket hydraulic cylinder that drives the bucket, A pressure oil supply pipe that is piped along the outer surface of the boom and supplies pressure oil from the hydraulic pressure generator to each of the hydraulic cylinders;
In a hydraulic excavator including a pipe cover that protects the pressure oil supply pipe, the lower plate of the boom is formed in a shape in which at least one side of the boom protrudes outward from the outer surface of one of the side plates. A hydraulic excavator characterized in that the pressure oil supply pipe is arranged along the outer surface of the side plate on the side where the lower plate projects, and the periphery of the pressure oil supply pipe is covered with a pipe cover. 2. The hydraulic excavator according to claim 1, wherein the boom is formed in a quadrilateral cross section or a frame shape similar thereto, and at least one side of a lower plate of the boom is formed from an outer surface of one side plate. The hydraulic excavator is also characterized by protruding outward. 3. The hydraulic excavator according to claim 1, wherein the protrusion amount of the lower plate is equal to the protrusion amount of the pipe cover. 4. The hydraulic excavator according to claim 1, wherein an upper plate of the boom is formed in a shape in which at least one side of the boom projects outward from an outer surface of the one side plate. A hydraulic excavator characterized by that. 5. The hydraulic excavator according to claim 1, wherein one side of the pipe cover is detachably fastened to an upper surface of a lower plate of the boom. Hydraulic excavator. 6. The hydraulic excavator according to claim 1, wherein the boom is a first boom pivotally connected to the revolving structure by a pin, and an offset cylinder for the first boom. A hydraulic excavator, characterized in that it comprises a second boom that is pin-connected so as to be movable laterally.