JPH11200409A - Structure for placing flexible pipe of swing type working machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a structure for placing the flexible pipes of a swing type working machine, suited for miniaturizing a main body while providing good maintainability and visibility and preventing oil fouling. SOLUTION: A swing bracket 6 is connected by a vertical pin to a base 2 having a hydraulic source 3, and a swing hydraulic cylinder 8 is suspended between the base 2 and the side face 6s of the swing bracket 6. A working machine 4 having a working-machine hydraulic actuator is provided on the swing bracket 6, and a plurality of flexible pipes P (P1, P2) to be placed between the hydraulic source 3 and the working-machine hydraulic actuator of the swing type working machine 4 are placed on the side of the swing bracket 6 where the swing hydraulic cylinder 8 is placed. In that case, a first support member 10 into which the flexible pipes P combined are loosely fitted is provided on the side face 6s of the swing bracket 6, and a clearance for a curve is provided in the part of each flexible pipe P situated within an area extending from the base 2 to the first support member 10, this part being placed between the swing bracket 6 and the swing hydraulic cylinder 8.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an arrangement structure of a flexible pipe of a swing type working machine of a machine having a swing type working machine, such as a power shovel.

[0002]

2. Description of the Related Art Some construction machines such as so-called power shovels and cranes have a swing type working machine as illustrated in FIG. This example will be described with reference to FIG.

The example of FIG. 7 is a small excavator. Like a medium-sized or large-sized excavator, the excavator has a base 2 rotatable on a traveling body 1 and a hydraulic source 3 mounted on the base 2. (Not shown), a work machine 4 and a driver's seat 5. A swing bracket 6 is pin-connected to the base 2 by a vertical pin 7, and a swing hydraulic cylinder 8 is installed between the swing bracket 6 and a side surface of the swing bracket 6. Swing bracket 6
The working machine 4 is provided on the upper side. Therefore, as shown in FIG.
When the swing hydraulic cylinder 8 is expanded and contracted X1, the swing bracket 6 swings around the vertical pin 7 X2 (left and right direction X2), and accordingly, the work implement 4 on the swing bracket 6 also swings. Thus, some power shovels have a swing type working machine.

The working machine 4 has various working machine hydraulic actuators. The working machine 4 of the example machine has a boom 41 whose base end is connected to the base 2 by a lateral pin and which can be raised and lowered by a hydraulic cylinder 91 for a boom, and a hydraulic cylinder 92 for an arm which has a rear end connected to the distal end of the boom 41 by a lateral pin. The arm 42 is rotatable by the arm 42, and the bucket 43 is connected to the distal end of the arm 42 by a horizontal pin at the bottom rear surface and is rotatable by a bucket hydraulic cylinder 93. In this case, the hydraulic cylinders 91 to 93 for the boom, the arm, and the bucket serve as hydraulic actuators for the working machine.
As is well known, the work machine of the power shovel is not only the above-mentioned boom & arm type, but also an offset boom type,
There are various specifications such as a rotary arm type, and various types of attachments such as breakers, clamshells and cutters are prepared in place of the bucket 43. Most of these are driven by respective hydraulic actuators. The hydraulic actuator for work equipment includes these various hydraulic actuators. Hereinafter, such various hydraulic actuators are collectively referred to and denoted by reference numeral “9”, which is referred to as a working machine hydraulic actuator 9.

[0005] In a power shovel having such a swing-type working machine, high-efficiency work is achieved in a small space such as a bottleneck in a city, as shown in FIG. In order to “achieve high-efficiency work in a small space”, a power shovel or the like equipped with a swing-type work machine is also required to be downsized or ultra-miniaturized to correspond to the small space.

The arrangement of the flexible tube with respect to the hydraulic actuator 9 for the working machine of such a swing type working machine is similar to that of a medium-sized or large-sized excavator.
It is usually arranged on the upper surface of the. By the way, the flexible tube needs to be arranged with a length in which a “bending allowance” according to the undulation or swing of the boom 41 is secured. Similarly, the power shovel also needs to be configured to have a “bending space” corresponding to the “bending margin”. However, for example, in the case of a power shovel or the like in which the base end of the boom 41 is provided at the lower front part of the driver's seat 5, the "bending space" is secured by protruding the base end of the boom 41 forward, and only the protrusion amount There is a problem that miniaturization of a power shovel or the like is hindered. Even if the size is reduced in such a state, the "bending space" becomes smaller. For this reason, there is a problem that the maintainability of the flexible tube or the peripheral members of the flexible tube is reduced. On the other hand, for example, the base end of the boom 41 is connected to the driver's seat 5
In the case of a power shovel or the like provided on the side of the vehicle, a "bending space" can be easily secured, but there is a problem that the visibility of the driver's seat 5 from the side is reduced due to the bending of the flexible tube. In any case, when the flexible tube is damaged or detached, there is a problem that oil in the flexible tube stains around the driver's seat 5 and the boom 41. In order to solve such a problem, FIG.
As shown in FIG. 11 and FIG. 11, a structure is known in which a flexible tube P is disposed on the side of the swing bracket 6 where the hydraulic cylinder for swing 8 is disposed. Details are as follows.

(1) FIG.
This is a technique described in Japanese Unexamined Patent Publication (Kokai) No. H10-26095. As shown in the top view of the swing bracket portion in FIG. 7A and the side view in FIG. 7B, the bottom of the cylinder 8a of the hydraulic cylinder for swing 8 is pin-connected to the swing bracket 6, and the hydraulic cylinder for swing 8 Of the piston rod 8b is connected to the base 2 with a pin. A flexible tube connection block 61a extends outward from the side surface of the swing bracket 6, and a loose fitting clamp 61b extends outward from the side surface of the cylinder 8a on the head side. Each of the plurality of flexible tubes P has a distal end connected to the flexible tube connection block 61a, a flexible portion loosely fitted by the loose fitting clamp 61b, and a "bend margin" from the loose fitting clamp 61b to the base 2.
Having. In addition, each flexible tube P is arranged apart from each other,
It does not come into contact with each other and does not come into contact with the swing hydraulic cylinder 8 or the swing bracket 6.

(2) FIG. 11 shows a technique described in Japanese Utility Model Publication No. 1-24207. Also, the bottom of the cylinder 8a of the swing hydraulic cylinder 8 is pin-connected to the swing bracket 6, and the tip of the piston rod 8b of the swing hydraulic cylinder 8 is pin-connected to the base 2. A freely rotatable clamp 62a extends outward on the side surface of the swing bracket 6, and a loose fit clamp 62b extends outward on the side surface of the cylinder 8a on the head side. Each of the plurality of flexible tubes P is fixedly gripped and penetrated at the front part by a freely rotatable clamp 62a, and the flexible part is loosely fitted by a loose fitting clamp 62b, and extends from the loose fitting clamp 62b to the base 2. It has a "bending margin."
Incidentally, as shown in FIG.
Similarly to the technique described in Japanese Patent Application Publication No. 8 (1994), the flexible pipes P are arranged separately from each other so that they do not contact each other and do not contact the swing hydraulic cylinder 8 or the swing bracket 6.

[0009]

However, the above-mentioned "flexible pipe P is connected to the swing hydraulic cylinder 8 of the swing bracket 6".
Has the following problems.

(1) In order to reduce the size of an example machine working in a narrow bottleneck, it is important that each component does not protrude outward from the main body of the example machine. However, in the arrangement structure of the flexible tube of the above-described conventional swing type working machine, the flexible tube P projects outward beyond the hydraulic cylinder 8 for swing. In addition, the amount of protrusion occupies a large space as much as the flexible tubes P are arranged apart from each other. Of course, the flexible tube connection block 61a, the loose fitting clamp 61b, and the freely rotating clamp 62
a and the loose fit clamp 62b also project outward. Moreover, the loose fit clamp 61b and the loose fit clamp 62b move with the expansion and contraction of the hydraulic cylinder 8 for swing and the turning of the base 2. Therefore, the flexible tube P can easily come into contact with the worker and the surrounding fixtures, as well as the flexible tube connection block 61a, the loose fitting clamp 61b, the freely rotating clamp 62a and the loose fitting clamp 62b.
There is a problem that it is easily damaged by contact. That is, there is a problem that the main body of the example machine is substantially enlarged.

(2) The "bending margin" of the flexible tube P is provided on the rear side of the loose fitting clamp 61b or the loose fitting clamp 62b. Moreover, the loose fitting clamp 61b and the loose fitting clamp 62b
Is provided on the head side of the cylinder 8a. That is, no “bending allowance” of the flexible tube P is provided on the front side of the loose fitting clamp 61b or the loose fitting clamp 62b. For this reason, in the above-mentioned prior art, the miniaturization of the example machine main body is inhibited by the length of the cylinder 8a.

The present invention has been made in view of the above-mentioned prior art, and provides a flexible pipe arrangement structure of a swing-type working machine which has good maintainability and visibility and can prevent contamination of a driver's seat and around a boom by oil. The purpose is to do. Another object of the present invention is to provide a flexible pipe arrangement structure of a swing working machine suitable for downsizing a main body on which the flexible pipe arrangement structure of the swing working machine is mounted.

[0013]

In order to achieve the above-mentioned object, a first arrangement of the flexible tube of the swing-type working machine according to the present invention is as follows. Are connected by a vertical pin 7, a swing hydraulic cylinder 8 is installed between the base 2 and the side surface 6 s of the swing bracket 6, and a working machine 4 having a working machine hydraulic actuator 9 is provided on the swing bracket 6. A plurality of flexible pipes P arranged between the hydraulic source 3 and the hydraulic actuator 9 for the working machine in the swing-type working machine 4 in which the working machine 4 can be freely swung in the left-right direction X2 by the swing hydraulic cylinder 8 are mounted. In the arrangement structure of the flexible pipes P of the swing type working machine 4 arranged on the side of the swing bracket 6 where the hydraulic cylinders 8 for swinging are arranged, the flexible pipes P are bundled and loosely fitted. The support member 10 is provided on the side surface 6 s of the swing bracket 6, and a bend allowance is provided in a portion of the flexible tube P located in a region from the base 2 to the first support member 10. It is characterized in that it is arranged between the hydraulic cylinder 8.

According to the first configuration, the following operation and effect can be obtained. (1) Since the first support member 10 bundles the flexible tubes P, a bending margin is further provided at a portion of the flexible tube P located in a region from the base 2 to the first support member 10. Is disposed between the swing bracket 6 and the swing hydraulic cylinder 8, so that the "bending allowance" of the flexible tube P is not wasted as much as the length of the cylinder 8a unlike the related art. Therefore, it is suitable for reducing the size of the vehicle body on which the first configuration is mounted. Further, since there is almost no portion including the flexible tube P that protrudes outward from the main body (specifically, since the flexible tube P is surrounded by the swing bracket 6 and the swing hydraulic cylinder 8), the flexible tube P is flexible. The pipe P hardly comes into contact with the worker or the surrounding fixture, and therefore hardly breaks. If the flexible tube P
Can be prevented from being stained around the driver's seat by oil. Further, since the flexible tube P is arranged on the side of the swing bracket 6 on which the hydraulic cylinder 8 for swing is arranged, the maintainability and visibility are good. (2) Since the first support member 10 loosely fits the flexible tube P, a "bend margin" occurs not only at the rear of the first support member 10 but also at the front. That is, the degree of freedom of bending is increased, and therefore, local bending is less likely to occur, and the service life of the flexible tube P can be prolonged accordingly.

Second, in the first configuration, the flexible tube P
Is provided on the base 2.

According to the second configuration, the following operation and effect can be obtained. Depending on the shape of the base 2 and the form in which the flexible tube P is led out from the base 2, the flexible tube P may come into contact with, for example, a sharp corner of the base 2 and be easily damaged. However, according to the second configuration, the second support member 20 can be provided so as to avoid contact. Moreover, the second support member 20 bundles the rear part of the flexible tube P, while the first support member 10 bundles the front part of the flexible tube P and loosely fits. Therefore, the operation and effect of the first configuration are not impaired.

Third, in the first or second configuration,
The first support member 10 in which the flexible tubes P are bundled and loosely fitted has one or both of the rolling member 13a and the covering member 20a at a contact portion with the flexible tube P.

According to the third configuration, the following operation and effect can be obtained. Since the first support member 10 bundles and fits the flexible tubes P loosely, as is apparent from the operation and effect of the first configuration,
The substantially entire length of the flexible tube P can be used as a "bend margin". However, since the contact portion of the flexible tube P with the first support member 10 is substantially the same, there is a concern that the flexible tube P may be worn out as it is. However, in the third configuration, the first support member 10 is provided with the rolling member 13a and the covering member 20 in contact with the flexible tube P.
Since it has one or both of a, abrasion can be suppressed.

Fourth, in the second configuration, the flexible tube P
When the second support member 20 for bundling the flexible tube P fits loosely into the flexible tube P, the second support member 20 contacts one of the rolling member 13a and the covering member 20a or It is characterized by having both.

According to the fourth configuration, the following operation and effect can be obtained. The second support member 20 in the second configuration merely bundles the flexible tubes P. That is, the second support member 20 in the second configuration is configured such that the flexible tubes P are bundled and fixed,
And loose fitting. In the former type, the portion of the flexible tube P behind the second support member 20 cannot be used as a “bending margin”. On the other hand, in the latter type, the portion of the flexible tube P behind the second support member 20 can also be used as a "bending margin". Since the contact points are almost the same, there is a concern about abrasion. However, in the fourth configuration, similarly to the above-described third configuration, the second support member 20 includes the flexible tube P
Since one or both of the rolling member 13a and the covering member 20a are provided at the contact portion with the contact member, wear can be suppressed.

[0021]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to FIGS. 1 to 3 show the first embodiment.
Embodiment, FIGS. 4 to 6 show another embodiment. The example machine having the embodiment was the small power shovel illustrated in FIG. Therefore, the same elements as those in FIG. 7 are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a perspective view of a swing bracket portion of an example machine. Of the left and right side surfaces of the swing bracket 6, the first support member 10 is outwardly provided on the side surface 6 s on the side where the hydraulic cylinder for swing 8 is disposed and near the connecting position of the horizontal pin at the base end of the boom 41. It is provided. Further, a second support member 20 is fixed to a side surface 2s of the protruding portion 2a of the base 2. The plurality of flexible tubes P pass through the first and second support members 10 and 20 and are arranged between the swing bracket 6 and the swing hydraulic cylinder 8 so as to have a downwardly bent “bend margin”.

As shown in the assembly drawing of FIG. 2, the first support member 10 includes a pair of front and rear rods 11F and 11B and a bar 12
, Rollers 13a to 13c, and bolts 14 and 14. Rods 11F and 11B have bolt holes 11a at their base ends.
And is erected on the side surface 6s of the swing bracket 6 by bolts (not shown) through the bolt holes 11a. The rod 11F is fitted around the roller 13a from the tip and the rod 11B is fitted around the roller 13b from the tip so as to rotate freely.
Further, a bar 12 on which a roller 13c is rotatably fitted to the outside is erected between both ends by a bolt 14. The first support member 10 is, as shown in FIG.
Are bundled and supported in an annular shape surrounded by the side surface 6s of the swing bracket 6 and the rollers 13a to 13c.

As shown in the perspective view of FIG. 3, the second support member 20 is formed by bending and forming both ends of a flat plate 20b having bolt holes 20c at both ends and covering with resin leather 20a. And a bolt (not shown) through the bolt hole 20c.
This is screwed on the side surface 2s of the protrusion 2a of the base 2. Then, the second support member 20 bundles and fixes the flexible tubes P as shown in FIG.

The operation and effect of the above embodiment will be described.

(1) The first support member 10 is provided in the side surface 6s of the swing bracket 6 near the connecting position of the horizontal pin at the base end of the boom 41. Therefore, even if the boom 41 is raised and lowered, the flexible tube P bends substantially on the axis of the boom 41 (that is, on the pin axis of the substantially horizontal pin). Therefore boom 41
The bending trajectory of the flexible tube P at the time of the undulation becomes small, so that the flexible tube P does not suddenly protrude outward at a specific undulation angle. In other words, the appearance is improved by that much, and there is no contact or interference with others, which contributes to downsizing of the example machine main body.

(2) Since the first support member 10 loosely fits the flexible tube P, a "bend margin" behind the first support member 10 is provided.
In addition to the original, a subtle "bending allowance" occurs in the front as well. In other words, the degree of freedom of bending of the flexible tube P is increased, so that local bending is unlikely to occur.
The service life of the device.

(3) Even if the boom 41 is undulated and swings, the flexible tube P is connected to the rollers 13a to 13 of the first support member 10.
(c) does not give excessive bending or bending to the flexible tube (P). When the flexible tube P slides, the rollers 13a to 13c rotate, so that the flexible tube P slides smoothly, so that the flexible tube P can be prevented from being worn.

(4) Since the second support member 20 has the resin leather 20a serving as a covering member at the contact portion with the flexible tube P, the flexible tube P can be protected from external force. The covering member 20a may be, for example, a rubber hose or the like, or may be a coating with a low friction coefficient member such as Teflon. The use life of the flexible tube P is further extended by using such a low coefficient of friction member.

(5) The flexible tube P is made up of the first and second support members 1
0 and 20, and between the swing bracket 6 and the hydraulic hydraulic cylinder 8 with a downwardly protruding “bending allowance”. Further, the first and second support members 10 and 20 bundle the flexible tube P.
Thus, it is possible to eliminate a space in which the "bending allowance" of the flexible tube P is wasted as much as the length of the cylinder 8a as in the related art. Therefore, it contributes to downsizing of the example machine.

(6) Since the flexible tube P is surrounded by the swing bracket 6 and the swing hydraulic cylinder 8, the flexible tube P hardly comes into contact with an operator or a peripheral fixture, and is thus damaged. hard. The swing hydraulic cylinder 8 is usually provided on the opposite side of the driver's seat 5 as shown in FIG. There is no contamination of the upper surface of the boom 41 or the like.

(7) Since the flexible tube P is arranged on the side of the swing bracket 6 where the hydraulic cylinder for swing 8 is arranged, the maintainability and visibility are good.

Another embodiment will be described below.

(1) The first support member 10 includes three rollers 1 in front, rear, and side, excluding the side surface 6s of the swing bracket 6.
Although 3a to 13c are provided, as shown in FIG. 4, if the roller 13d is also provided on the side surface 6s of the swing bracket 6, the above-mentioned "sliding of the flexible tube P becomes smooth,
Therefore, the wear of the flexible tube P can be prevented ". Note that the rollers 13a to 13d may not be cylindrical members, but may be configured by arranging a plurality of rolling members like abacus balls. Further, the second support member 20 may be configured as shown in FIG. Further, as illustrated in FIG. 5, a configuration may be adopted in which a resin bar 20a is covered on a concave bar 20d having a fixed portion with a bolt or the like on the side surface 6s of the swing bracket 6 at both ends. FIG. 6
As shown in (1), the annular member 20e may be covered with a resin leather 20a and fixed to the side surface 6s of the swing bracket 6 via a universal joint 20f. In short, it is important that the first support member 10 is configured so that the flexible tube P is bundled and loosely fitted, for example, the resin leather 20a or the roller 1a.
3a to 13d may be omitted. Even in this case, substantially the same operation and effect as in the above embodiment can be obtained.

(2) Although the second support member 20 is covered with the resin leather 20a to protect the flexible tube P, the resin leather 20a may be omitted. That is, as described above, the flexible tube P is provided between the first and second support members 10 and 20 and the swing bracket 6
And the hydraulic cylinder for swing 8 are arranged so as to have a downwardly protruding “bending allowance”.
This is because the flexible tube P hardly slides on the support member 20 and therefore does not wear due to the sliding.
When the base 2 side of the flexible tube P does not contact the sharp corners of the base 2 or the like, as described above, the flexible tube P is moved between the first and second support members 10 and 20, and Since the swing bracket 6 and the swing hydraulic cylinder 8 are arranged with a downwardly protruding “bending allowance”, the second support member 20 may be omitted. That is, the second support member 20 may be used for positioning the flexible tube P as necessary, and therefore, the form may be the same as that in FIGS. 2 and 4 to 6.

(3) When the rolling members and the covering members are provided on the first and second support members 10 and 20, the present invention is not limited to either one as in the above embodiment, but may be a combination of both. It does not matter.

[Brief description of the drawings]

FIG. 1 is a perspective view of a swing bracket section in an embodiment.

FIG. 2 is an assembly view of a first support member.

FIG. 3 is a perspective view of a second support member.

FIG. 4 is a perspective view of another example of the first support member.

FIG. 5 is a perspective view of another example of the first support member.

FIG. 6 is a perspective view of another example of the first support member.

FIG. 7 is a perspective view of a small power shovel having a swing type working machine.

FIG. 8 is a diagram of the swing mechanism of FIG. 7;

FIG. 9 is an explanatory diagram of an excavation work on a narrow road by the power shovel of FIG. 7;

10A and 10B show a conventional example, in which FIG. 10A is a top view of a swing bracket portion, and FIG. 10B is a side view.

FIG. 11 is a top view of another conventional swing bracket portion.

[Explanation of symbols]

2 ... Base, 3 ... Hydraulic source, 4 ... Swing type working machine, 6 ... Swing bracket, 6s ... Swing bracket side surface, 7
... vertical pin, 8 ... hydraulic cylinder for swing, 9 ... hydraulic actuator for work equipment, 10 ... first support member, 13a-1
3c: rolling member (roller), 20: second support member, 20
a: coating member (resin leather), P: flexible tube, X2: swing direction (left-right direction).

Claims (4)

[Claims] 1. A swing bracket 6 is connected to a base 2 having a hydraulic pressure source 3 by a vertical pin 7, and a swing hydraulic cylinder 8 is installed between the base 2 and a side surface 6s of the swing bracket 6. The work machine 4 having the machine hydraulic actuator 9 is provided on the swing bracket 6, and the work machine 4 can be freely swung in the left-right direction X <b> 2 by the swing hydraulic cylinder 8. In the arrangement structure of the flexible pipes P of the swing type working machine 4 in which a plurality of flexible pipes P arranged between the hydraulic actuators 9 are arranged on the arrangement side of the swing hydraulic cylinders 8 of the swing bracket 6, The first support member 10 into which the flexible tubes P are bundled and loosely fitted is attached to the swing bracket 6.
And the first support member 1 from the base 2.
A flexible pipe having a bending margin is provided at a portion of the flexible tube P located in a region up to zero, and this portion is disposed between the swing bracket 6 and the hydraulic hydraulic cylinder 8 for swing. Arrangement structure. 2. The flexible tube arrangement structure of a swing type working machine according to claim 1, wherein a second support member 20 for bundling the flexible tubes P is provided on the base 2. 3. The first support member 10 according to claim 1, wherein the first support member 10 that bundles and loosely fits the flexible tubes P has one of a rolling member 13a and a covering member 20a in a contact portion with the flexible tubes P. Or the arrangement structure of the flexible tube of the swing type working machine characterized by having both. 4. When the second support member 20 that bundles the flexible tubes P is loosely fitted with the flexible tubes P, the second support member 20 is in contact with the flexible tube P. Rolling member 13
a and a covering member 20a, or both.