JP2002021812A - Three-face protecting structure of almost u-shaped section of hydraulic cylinder - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a protecting structure of a hydraulic cylinder rod for angle mounting in a hydraulic cylinder for angle a three-face protecting cover of almost U-shaped section protecting three sides of upward, inward, and downward sides of the hydraulic cylinder for angle, in a multi-functional excavating work machine provided with a bucket and a blade. SOLUTION: A guided member is provided in a side face of an external peripheral surface of a cylinder part of a hydraulic cylinder for angle, a guide plate supporting and guiding the guided member interposed is provided in an inner side face of a side surface plate of a three-face protecting cover of U-shaped section provided in a rod part of the hydraulic cylinder for angle in a multi-functional excavating work machine, a slide guide member is provided in an upper face and a lower face of the external peripheral surface in the cylinder part of the hydraulic cylinder for angle.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multifunctional excavating machine having a shovel-based front attachment and a blade used for digging work and leveling work in a landscaping business or a relatively narrow construction site. The present invention relates to a three-sided protection structure for a hydraulic cylinder that performs an angle operation on a mounted blade.

[0002]

2. Description of the Related Art In a landscaping business, which is a relatively small-scale civil engineering work, or a work site in a relatively narrow construction site, it is necessary to promote labor-saving and efficient work to shorten the construction period. Therefore, the mechanization of these excavation work and leveling work is being promoted, and excavation is performed by using a bucket of a multifunctional excavator equipped with a bucket and a blade in one excavator, and the excavated soil and the like are removed. The excavator is used to push earth and sand with a blade while moving forward, to perform leveling work while moving forward, and to level the ground excavated while moving backward using a blade.

A conventional multifunctional excavator equipped with buckets and blades will be described with reference to the drawings. FIG. 1 shows a blade 6 attached to a lower traveling unit 1 and a bucket 12 attached to an upper revolving unit 2. It is a side view of a multifunctional excavator. An upper revolving unit 2 is rotatably mounted via a revolving round body 3 provided on the lower traveling unit 1. And
A blade 6 for leveling the ground is mounted on a blade elevating frame 7 attached to the lower traveling body 1 in front of or behind the lower traveling body 1, and the blade elevating frame 7 is moved by a blade elevating hydraulic cylinder 8. Is raised and lowered to adjust the height of the blade 6, and the ground leveling work is performed while the excavator is moving forward or backward.

[0004] During the leveling operation, the hydraulic cylinder 8 for raising and lowering the blade is provided so that the hydraulic cylinder 8 for raising and lowering the blade is not damaged by soil or the like falling from above over the blade 6 during the leveling operation. And a hydraulic cylinder protective cover 24 for raising and lowering the blade only on its upper surface.
Is provided. The hydraulic cylinder protection covers 35 and 36 are provided not only for the blade lifting hydraulic cylinder 8 but also for the other hydraulic cylinders 25 and 26.

[0005] A base end of a boom 10 is attached to the upper swing body 2 via a boom support 9 in front of the upper swing body 2.
An arm 11 is attached to a leading end of the “0”, and a bucket 12 for excavating and loading earth and sand is attached to the leading end. Reference numeral 13 denotes a boom lifting hydraulic cylinder for the boom 10, reference numeral 14 denotes an arm hydraulic cylinder for the arm 11, and reference numeral 15 denotes a bucket hydraulic cylinder for the bucket 12. These boom lifting hydraulic cylinder 13 and arm hydraulic cylinder 1
4. The hydraulic cylinder 15 for the bucket excavates the ground and excavates the ground by the bucket 12 by bending the boom 10, the arm 11, and the bucket 12 by operating the operation lever 17 attached to the operation lever stand 16 by the operator. It carries out the work of transporting and loading earth and sand, moving forward and backward, rotating, and turning the upper rotating body. In addition,
Reference numeral 4 denotes a seat for an operator, reference numeral 5 denotes a canopy, and reference numeral 16 denotes an operation lever stand of the operation lever 17.

Next, a multifunctional excavator equipped with a conventionally known bucket and blade will be described with reference to FIG. FIG. 2 is a developed plan view showing a structure for attaching a hydraulic hose to a hydraulic cylinder of a conventional multifunctional excavator. Among various operations of a multifunctional excavator equipped with a conventionally known bucket and blade, for example, the operator is attached to an operation lever stand 16 provided on the upper revolving unit 2 by an operator to operate the blade 6 at an angle. When the operation lever 17 for angle operation is operated, the pressure oil generated by the operation of the operation lever 17 is supplied to the lower traveling body 1 from the oil passage of the swivel joint 21 inside the revolving round body 3 provided on the lower traveling body 1 side. The selected angle operation selector valve 22 is switched.

[0007] The selector valve 22 is connected to hydraulic oil from a hydraulic pump (not shown). When the selector valve 22 is switched, the hydraulic oil from the hydraulic pump is connected to the output port of the selector valve 22. Through the angle hydraulic hoses 32, 32, one end of which is mounted on the bracket 31 provided on the blade elevating frame 7, and the other end of which is mounted on the bracket 30 provided on the back surface of the blade 6. It is sent to the rod side or the bottom side, expands and contracts the angle hydraulic cylinder 26, and advances and retreats the left and right ends of the blade 6 attached to the excavator in the front-rear direction to make an angle to the blade 6. Reference numeral 34
Is an inverted U-shaped hydraulic hose guide for guiding and supporting the hydraulic hose, and is provided on the upper surface side of the blade lifting frame 7.

In order to supply the pressure oil to the angle hydraulic cylinder 26 which makes the blade 6 angle in the front-rear direction in this way, from the angle operation selector valve 22 to the rod side or the bottom side of the angle hydraulic cylinder 26, It is connected by one angle hydraulic hose 32 along the outside of the blade elevating frame 7.

The angle hydraulic cylinder 26 has a bottom side of the angle hydraulic cylinder 26 attached to an angle hydraulic cylinder mounting bracket 37 provided on a side surface of the blade elevating frame 7 via a universal joint. The rod portion of the angle hydraulic cylinder 26 is mounted on a mounting bracket 30 provided on the back surface of the blade 6 via a spherical bush.

The angle hydraulic cylinder 26 attached to the blade elevating frame 7 and the back side of the blade 6 expands and contracts when pressure oil is supplied to the rod side or the bottom side of the angle hydraulic cylinder 26. , By the expansion and contraction of the angle hydraulic cylinder 26,
The blade 6 whose rear surface is pivotally supported at the center of the distal end of the blade elevating frame 7 has the left and right ends of the blade that are angled in the front-rear direction with the pivot portion as the center, and the blade 6 is moved in accordance with the forward and backward movement of the excavator. The earth or sand on the front or back of the blade is discharged to the side along the inclination of the blade.

[0011]

However, in the conventional multifunctional excavator equipped with a bucket and a blade, particularly in a leveling operation while dragging the blade 6 to the ground and moving backward, the blade is not moved as in the case of forward movement. The earth and sand do not pass over the surface of the blade 6, but the earth and sand accumulate on the side of the dragged blade 6 where the hydraulic cylinder for each operation is attached, and the accumulated earth and sand hit the exposed rod portion of the hydraulic cylinder for each operation, It is easily damaged by earth and sand.

In the conventional multifunctional excavator, since only the hydraulic cylinder protection covers 24, 25, and 35 are provided on the upper side of each working hydraulic cylinder, the exposed excavator is not protected by the hydraulic cylinder protection cover. The side and lower part of the rod part of the hydraulic cylinder are damaged and damaged by earth and sand. When the rod portion is damaged in this way, the sealing performance between the rod portion and the cylinder portion of the hydraulic cylinder is impaired, and the function as the hydraulic cylinder is impaired. At the end, the entire hydraulic cylinder must be replaced.

In particular, the angle hydraulic cylinder 26 for tilting the blade 6 in the front-rear direction is provided on the ground on which the leveling work of the blade elevating frame is performed as compared with the other hydraulic cylinders 8 for raising and lowering the blade and the hydraulic cylinder 25 for tilting. Since it is attached to a location close to G, the inside and lower part of the rod part is more easily damaged and damaged by earth and sand than other hydraulic cylinders. The angle hydraulic cylinder 26 is attached to a location close to the ground G, and is relatively hard to see by the operator. In many cases, the lower side of the rod portion of the cylinder 26 was damaged by hitting a stone or rock on the ground G.

The present invention has been made in view of the above-mentioned problems, and has a substantially U-shaped cross section having three surfaces for protecting the upper, inner, and lower sides of an angle hydraulic cylinder. It is an object of the present invention to provide a protection structure for an angle hydraulic cylinder rod in which the three-sided protective cover is attached to the angle hydraulic cylinder.

[0015]

According to one aspect of the present invention, there is provided a multifunctional excavator having a bucket and a blade, wherein the rod portion of a hydraulic cylinder for an angle is provided. A three-sided protection cover having a substantially U-shaped cross section for protecting the upper side, the inner side, and the lower side of the rod is attached to the mounting member of the rod portion.

In order to achieve the above object, the invention according to claim 2 of the present invention is characterized in that the inner surface of the side plate of the three-sided protective cover is provided on the outer surface of the cylinder portion of the angle hydraulic cylinder. A guide plate for supporting and guiding the provided guided member is provided, and a sliding guide member is provided on an upper surface and a lower surface of an outer peripheral surface of a cylinder portion of the angle hydraulic cylinder. is there. In order to achieve the above object, the invention according to claim 3 of the present invention is characterized in that the sliding guide member is made of rubber or synthetic resin.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below with reference to FIG.
This will be described with reference to FIGS. FIG. 3 is a side view of the hydraulic cylinder equipped with the hydraulic cylinder three-side protection cover of the present invention, FIG. 4 is a plan view of the hydraulic cylinder equipped with the hydraulic cylinder three-side protection cover of the present invention, and FIG. It is sectional drawing by the yy line of FIG.

The angle hydraulic cylinder 26 for angled the blade 6 of the multifunctional excavator in the front-rear direction is provided with a mounting member 39 of the cylinder part of the angle hydraulic cylinder 26 provided on a side surface of the blade elevating frame 7. The mounting member 40 of the rod portion of the angle hydraulic cylinder 26 is attached to a mounting bracket 30 provided on the back side of the blade 6 by a spherical bush. Mounted through.

The mounting member 40 of the rod portion of the angle hydraulic cylinder 26 includes a hydraulic cylinder 2 for the angle.
From the three steel plates of the upper surface plate 411 of the three-side protection cover, the side surface plate 412 of the three-side protection cover 41, and the lower surface plate 413 of the three-side protection cover having a margin slightly longer than the length of the rod portion 6 at the time of maximum extension. A hydraulic cylinder three-sided protective cover 41 having a substantially U-shaped cross section is provided. A side plate 412 of the three-sided protective cover 41 is mounted on a mounting boss member 42 provided on the mounting member 40 by mounting bolts 43. The rod is covered and protected.

Then, the side plate 41 of the three-side protection cover 41
2 is provided with guide plates 46, 46 for supporting and guiding the member to be guided 45 provided on the inner surface of the cylinder portion of the angle hydraulic cylinder 26 described later.

On the other hand, a sliding guide member 44 made of rubber or synthetic resin is provided on the upper surface of the cylinder portion of the angle hydraulic cylinder 26, and a rubber or synthetic resin material is similarly provided on the lower surface of the cylinder portion of the hydraulic cylinder 26. Sliding guide members 44 are provided on the outer peripheral surface of the cylinder portion of the hydraulic cylinder 26.
5 are provided.

Therefore, the angle hydraulic cylinder 2
With the expansion and contraction of 6, the rod portion of the angle hydraulic cylinder 26 is covered by the three-sided protective cover 41 having a substantially U-shaped cross section. Can be prevented. Also, the angle hydraulic cylinder 26
With the expansion and contraction of the three-side protection cover 41 attached to the rod portion of the angle hydraulic cylinder 26, the guide plates 46, 46 provided on the side plates 412 of the three-side protection cover 41 Since the guide member 45 is supported and guided across the guided member 45 provided on the inner surface of the cylinder portion, the three-side protection cover 41 attached to the rod portion of the angle hydraulic cylinder 26 is detached from the cylinder portion of the angle hydraulic cylinder 26. It is supported and guided without doing.

The three-sided protective cover 41 has a gap corresponding to the thickness of the sliding guide members 44 provided on the outer peripheral surface of the cylinder portion of the angle hydraulic cylinder 26 and the upper and lower surfaces of the cylinder portion of the angle hydraulic cylinder 26. Is supported by sliding. One end of the three-side protection cover 41 attached to the rod portion of the angle hydraulic cylinder 26 is attached to an attachment boss member 42 provided on the attachment member 40 of the rod portion, and the other end has a thickness corresponding to the thickness of the sliding guide member 44. Therefore, unlike the support in the cantilever support state, the slide support is performed in a stable state.

Further, even if earth and sand hit the upper surface plate 411 and the lower surface plate 413 of the three-surface protection cover 41 during the work, the upper surface plate 411 and the lower surface plate 413 of the three-surface protection cover 41 and the upper surface of the cylinder portion of the angle hydraulic cylinder 26 are removed. Since the sliding guide member 44 made of rubber or synthetic resin is interposed between the lower surface and the lower surface, the three-side protection cover 41 can reduce the impact with earth and sand.

Since the mounting member 40 is mounted on the mounting bracket 30 provided on the back surface of the blade 6 via the spherical bush, the rod portion of the angle hydraulic cylinder 26 swings when the blade 6 moves up and down. There is a possibility that the three-sided protective cover 41 itself, which is attached with the mounting bolts 43 for protecting the rod portion of the angle hydraulic cylinder 26, may be twisted together. In consideration of the angle at which the angle hydraulic cylinder 26 swings, a larger spherical bush is used in advance to cope with twisting of the three-side protection cover 41 by elevating the blade 6.

A three-sided protective cover 41 having a substantially U-shaped cross section is provided.
As shown in FIG. 5, the top plate 411, the side plate 412 of the three-side protection cover 41, and the bottom plate 41 of the three-side protection cover
Although the hydraulic cylinder three-side protection cover 41 made of three steel plates 3 and having a substantially U-shaped cross section is shown, a three-side protection cover having a cross-sectional shape as shown in FIGS. 6 and 7 may be a modification of the three-side protection cover. .

[0027]

As described above, in the protection structure for a hydraulic cylinder rod for an angle according to the present invention, a cross-section substantially protecting the upper side, the inner side, and the lower side of the rod portion of the angle hydraulic cylinder is provided. U-shaped three-sided protective cover,
By attaching to the mounting member of the rod portion, it is possible to prevent the earth and sand during the leveling work from being damaged on the exposed rod portion of the angle hydraulic cylinder.

Also, a three-sided protective cover having a U-shaped cross section provided over the rod portion and the cylinder portion of the angle hydraulic cylinder is supported by the guided member provided on the cylinder portion and the guided member provided on the rod portion. Since the support guide is provided by the guide plate for guiding, there is an effect that the three-sided protective cover having a substantially U-shaped cross section can be reliably supported and guided during the support guide.

Further, since a sliding guide member made of rubber or synthetic resin is provided on the upper and lower surfaces of the cylinder portion of the angle hydraulic cylinder, the three-side protection cover 41 can reduce the impact with earth and sand. It has the effect of

[Brief description of the drawings]

FIG. 1 is a side view of a multifunctional excavator equipped with a bucket and a blade,

FIG. 2 is an exploded plan view showing a mounting structure of a hydraulic hose to a hydraulic cylinder of a conventional multifunctional excavator,

FIG. 3 is a side view of a hydraulic cylinder equipped with a hydraulic cylinder three-side protection cover of the present invention;

FIG. 4 is a plan view of a hydraulic cylinder equipped with a hydraulic cylinder three-side protection cover according to the present invention;

FIG. 5 is a sectional view taken along the line II in FIG. 3;

FIG. 6 is a cross-sectional view of a modified example of the hydraulic cylinder three-sided protective cover of the present invention.

FIG. 7 is a sectional view of another modification of the hydraulic cylinder three-side protection cover of the present invention.

[Explanation of symbols]

1 lower traveling structure, 2 upper revolving structure, 3 revolving round body,
4 seats, 5 canopy, 6 blades, 7
Blade lifting frame, 8 blade lifting hydraulic cylinder, 9 boom support, 10 boom, 11 arm, 12 bucket, 13 boom lifting hydraulic cylinder, 14 arm hydraulic cylinder, 15 bucket hydraulic cylinder, 16 operating lever stand,
17 operation lever, 18 mounting bracket, 19
Hydraulic cylinder for tilting, 20 machine units, 21 swivel joint, 22 selector valve, 23
Blade lifting hydraulic cylinder mounting member, 24 Blade lifting hydraulic cylinder protection cover, 25 Tilt hydraulic cylinder, 26 Angle hydraulic cylinder, 2
7 Frame mounting bracket, 28 Hydraulic hose relay holding bracket, 29 Hose connection joint, 3
0 mounting bracket, 31 mounting bracket, 3
2 hydraulic hose for angle, 33 hydraulic hose for tilt, 34 hydraulic hose guide, 35 hydraulic cylinder protective cover for angle, 36 hydraulic cylinder protective cover for tilt, 37 hydraulic cylinder mounting bracket for angle, 38 rod part, 39 cylinder part mounting 40 mounting member of rod part, 41 hydraulic cylinder three-side protection cover, 411 three-side protection cover top plate, 412 three-side protection cover side plate, 413 three-side protection cover bottom plate, 42 mounting boss member, 43
Mounting bolt, 44 sliding guide member, 45 guided member, 46 guide plate, G ground.

Claims (3)

[Claims] 1. A multifunctional excavator equipped with a bucket and a blade, which has a substantially U-shaped cross section for protecting the upper, inner and lower three sides of a rod portion of an angle hydraulic cylinder. A protection structure for an angle hydraulic cylinder rod, wherein a cover is attached to an attachment member of the rod portion. 2. A guide plate for supporting and guiding a member to be guided provided on a side surface of an outer peripheral surface of a cylinder portion of an angle hydraulic cylinder is provided on an inner surface of a side plate of the three-surface protection cover. The angle hydraulic cylinder rod protection structure according to claim 1, wherein a sliding guide member is provided on an upper surface and a lower surface of an outer peripheral surface of a cylinder portion of the hydraulic cylinder. 3. The protection structure for an angle hydraulic cylinder rod according to claim 1, wherein said sliding guide member is made of rubber or synthetic resin.