JP2577751Y2 - Work machine with blade - Google Patents

Description

[Detailed description of the invention]

[0001]

The present invention relates to a hydraulic shovel,
The present invention relates to a working machine with a blade, such as a wheel loader or a bulldozer, which is suitably used for performing earth removal work and the like.

[0002]

2. Description of the Related Art FIGS.
A hydraulic excavator will be shown as an example of a working machine with a door.

In the figure, reference numeral 1 denotes a hydraulic excavator body as a working machine main body. The hydraulic excavator main body 1 includes a lower traveling body 2 and an upper revolving body 3 rotatably provided on the lower traveling body 2.
And a working device 4 provided on the upper swing body 3.

[0004] Reference numeral 5 denotes an earth removal device provided on the hydraulic excavator main body 1 for performing earth removal work. The earth removal device 5 is mounted on a track frame 2 A of the lower traveling body 2, on the left and right crawler belts 2.
B, and a pair of left and right support brackets 6 and 6 (only one is shown) provided between B and a pair of left and right arms 7 and 7 (one of which is rotatably supported by each support bracket 6). (Shown only), a blade 8 provided as a discharge plate provided on the tip end side of each arm 7, and a lifting cylinder 10 described later.

As shown in FIG. 7, each arm 7 is provided with an arm main body 7A, a boss 7B provided at a base end of the arm main body 7A, and an upwardly projecting intermediate portion of the arm main body 7A. A boss 7B of each arm 7 is rotatably supported by the support bracket 6 via a pin 9 so as to be rotatable.

A lifting cylinder 10 for raising and lowering the blade 8 is generally constituted by a tube 11 and a rod 12 projecting from the tube 11 as shown in FIG. The rod 12 has a mounting eye 11B described later rotatably mounted on a bracket portion 7C of the arm 7 via a pin 13, and the rod 12 has a mounting eye 12B described later mounted on the support bracket 6 via a pin 14 above the arm 7. It is pivotally supported.

Here, reference numeral 11 denotes a tube constituting the lifting cylinder 10. The tube 11 is fixed to a cylindrical tube main body 11A and a base end of the tube main body 11A. 7 and pressure oil supply / discharge ports 11C and 11D provided on the outer peripheral surface of the tube main body 11A on the base end side and the distal end side, respectively. A supply / discharge pipe 11F having a base 11E is attached to the base oil pressure supply / discharge port 11C.
The base 11E of 1F is connected to the pressure oil supply / discharge port 11D by the reinforcing member 1
It is connected on the tube main body 11A via 1G.

Reference numeral 12 denotes a rod. The rod 12 has a base end side slidably inserted into a tube main body 11A, and is fixed to a piston (not shown) in the tube main body 11A; It is roughly constituted by a mounting eye 12B provided on the distal end side of the main body 12A. The lifting / lowering cylinder 10 defines the interior of the tube body 11A into two oil chambers (not shown) by the pistons, and pressurized oil is supplied to the respective oil chambers from the respective pressure oil supply / discharge ports 11C and 11D communicating with the respective oil chambers. The piston is driven by supplying and discharging
2 is expanded and contracted from the tube 11.

Reference numeral 15 denotes a screw seat fixed to the outer peripheral surface on the distal end side of the tube main body 11A by means of welding or the like.
Screw holes 15A, 15A are formed.

Reference numeral 16 denotes a protective cover attached to the tube 11. The protective cover 16 is formed by bending a thin steel plate, for example, in a substantially U-shaped cross section.
Extending in the axial direction. The protective cover 16 is fastened to the screw seat 15 by bolts 17, 17,
It is attached to the distal end side of the tube main body 11A.

The prior art is constructed as described above, and excavates soil and the like by operating the working device 4 provided on the upper swing body 3. On the other hand, in the case of performing the unloading work by the unloading device 5 provided on the lower traveling body 2,
The rod 12 of the lifting cylinder 10 is extended to extend the arm 7
Is lowered together with the blade 8, and the hydraulic excavator body 1 is advanced while the lower surface of the blade 8 is in contact with the ground to perform earth discharging work. After completion of the discharging operation, the rod 12 is reduced into the tube 11 so that the arm 7 is swung upward to lift the blade 8 upward as shown by the two-dot chain line in FIG.

The protective cover 16 is connected to the rod body 12.
By covering the rod body 12A at an interval from the upper side of A, for example, rocks or the like that have fallen during excavation work collide with the rod body 12A of the lifting cylinder and damage the outer peripheral surface of the rod body 12A. Is prevented from doing so. Further, during the earth removal operation, the earth and sand to be earthed fall from the rear surface of the blade 8 to the lower traveling body 2 side over the upper end of the blade 8 and adhere to the outer peripheral surface of the rod body 12A. Slides with the tube 11, the rod body 12
Since the outer peripheral surface of A is damaged, this is prevented by the protective cover 16.

[0013]

In the prior art described above, the tip of the protective cover 16 contacts the mounting eye 12B or the support bracket 6 when the rod 12 is contracted at the minimum, and interferes with the operation of the elevating cylinder 10. , The protective cover 1
The length of the protective cover 16 is formed shorter than the length of the rod 12 protruding from the distal end of the tube 11 when the rod 12 is fully extended so that the rod 6 itself is not damaged. For this reason,
When a large amount of earth and rocks fall on the lifting cylinder 10 during the earth removal operation, the earth and sand are deposited on the upper surface of the protection cover 16, and the protection cover 16 is indicated by a two-dot chain line in FIG. In this case, the distal end of the protective cover 16 may be damaged by cutting the outer peripheral surface of the rod body 12A. There is a problem that the oil liquid in the cylinder 10 flows out.

The present invention has been made in view of the above-described problems of the prior art. The present invention can reliably protect the outer peripheral surface of the rod of the lifting cylinder even when the rod of the lifting cylinder is greatly extended, and can prevent oil leakage. Blur that can prevent the occurrence of
It is intended to provide a working machine with a sword.

[0015]

In order to solve the above-mentioned problem, the feature of the structure adopted in the invention of claim 1 is that the structure is fixed to the rod projecting end side of the lifting / lowering cylinder and is separated in the front-back direction in the axial direction.
And between a and a screw seat having a plurality of screw holes are formed, the maximum elongation to Ji <br/> length to reach the cube even when the order the rod to protect the protruding part before Symbol rod, before Symbol tube Protective cover extending along, and screwed into each screw hole of the screw seat,
At a plurality of positions separated from the base end side of the protective cover back and forth,
Fixed to the screw seat, Bei a plurality of bolts Ru extend to the outer peripheral side of <br/> the tube distal end side of the protective cover as a free end
Configuration . Also, the invention of claim 2 is:
The protective cover is formed by bending in a circumferential direction along the outer peripheral surface of the tube so as to partially cover the outer peripheral surface of the tube.

[0016]

According to the first aspect of the present invention, a plurality of axially separated plural parts are provided.
Screw holes with screw holes and screwed into these screw holes
Use multiple bolts to move the proximal end of the protective cover
Can be fixed to the rod in several positions, increasing the fixing strength
And the whole protective cover cantilevered to the protruding end of the rod.
It can be fixed in a supported state. Then, the protective cover fixed to <br/> projecting end of the rod, because it reaches the tube even when the maximum extension of the rod, even when earth removal work rod of the elevating cylinder is protruded largely from the tube, the rod The rod can be always covered with the protective cover, and the rod can be reliably protected from earth and sand falling on the lifting cylinder. In addition, according to the configuration of claim 2, the protective cover is bent in the circumferential direction along the outer peripheral surface of the tube and has a convex curved shape.
The strength against these earth and sand can be increased, and the rod of the lifting cylinder can be reliably protected by the protective cover.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of the present invention will be described below in detail with reference to FIGS. The same reference numerals are given to the same components as those of the above-described conventional technology, and the description thereof will be omitted.

FIGS. 1 to 4 show a first embodiment of the present invention.

In the figure, reference numeral 21 denotes an elevating cylinder, which is substantially the same as the cylinder 10 described in the prior art, and includes a tube 11 and a rod 22 to be described later slidably inserted into the tube 11. It is roughly composed of

Reference numeral 22 denotes a rod. The rod 22 is provided with a piston (not shown) at the base end side and is slidably inserted into the tube main body 11A in substantially the same manner as the rod 12 described in the related art. 22A and the rod body 2
Mounting eye 22B provided on the tip side (projecting end side) of 2A
However, a screw seat 23 is provided on the mounting eye 22B of the rod 22.

Here, the screw seat 23 is, as shown in FIG.
It is formed in a rectangular shape having a length substantially equal to the radius of the mounting eye 22B from a thick plate material, and its width is smaller than the width of the mounting eye 22B as shown in FIG. Then, the screw seat 23 is attached by welding tangentially to the upper surface side of the rod body 22 A. In addition, the screw seat 23
Has two screw holes 23A and 23A in a portion corresponding to a contact point with the mounting eye 22B and a front portion located on the tube 11 side.
23A are formed, and each screw hole 23A is formed on the shaft of the rod 22.
It is arranged in front and back in the direction .

Reference numeral 24 denotes a protective cover formed of, for example, a thin steel plate or the like. The protective cover 24 is located on the base end side.
Mounting part 24 fixed to mounting eye 22B side of rod 22
A and a cover portion 24B extending from the mounting portion 24A toward the tube 11 and having a free end on the distal end side.
Is, the cover unit 24B covers the rod 12 to the maximum extension of the rod 12 from above, and have a length reaching the tube 11. In here, the mounting portion 24A and the cover part 2
The central portion of 4B is formed as a rectangular flat portion 24C.
Have been. As shown in FIG. 3, both ends of the flat portion 24C in the width direction are bent along the outer peripheral surface of the tube 11 in a substantially “C” shape in the circumferential direction, and are formed between the mounting portion 24A and the cover portion 24B. Inclined portions 24D, 24D that become gradually wider are provided . Thereby , the protective cover 24 has a convex curved shape, and is disposed so as to face the tube 11 in a vertical direction at a predetermined interval.

Further, the mounting portion 24A of the protective cover 24
Is a bolt 2 screwed into each screw hole 23A of the screw seat 23.
5,25 to cover the screw seat 23 with, the screw seat 2
3 are fixed at two places separated from each other back and forth. Soshi
The protective cover 24 is attached to the rod 22 by each bolt 25.
Attached to the protruding end (mounting eye 22B) side with cantilever support
The distal end side of the cover portion 24B is located on the outer peripheral side of the tube 11.
It is configured to extend to .

The present embodiment has the above-described structure, and the protection cover 24 covers the rod 22 protruding from the tube 11 from above and protects the rod 22 from falling rocks and earth and sand. There is no particular difference from the prior art.

[0025] However, in this embodiment, extends with a predetermined length toward the tube 11 side to the mounting eye 22B of the rod 22, screw holes 23A in the longitudinal two positions in the axial direction, 23A is
A formed screw seat 23 is provided, and each screw hole of the screw seat 23 is provided.
By screwing the bolt 25 and 25 to 23A, the coercive
The mounting portion 24A of the protective cover 24 is
The protective cover 24 is formed so as to completely cover the rod 12 and reach the tube 11 even when the elevating cylinder 21 is fully extended, while being fixed to the mounting eye 22B of the pad 22 ,
Extend the distal end side of the protective cover 24 to the outer peripheral side of the tube 11.
The following functions and effects can be obtained
be able to. That is, with respect to the mounting eye 22B of the rod 22,
The protective cover 24 is formed by using a female screw seat 23 and each bolt 25.
Can be fixed in a cantilevered state, and two bolts 25, 25
Protective cover for mounting eye 22B of rod 22
24 as well as a protective cover.
-24 to extend the distal end side to the outer peripheral side of the tube 11,
No special guide member is required, and the lifting cylinder 21
The structure for attaching the protective cover 24 to the protective cover 24 can be simplified.
Wear. Then, by extending the rod 22 in a state of lowering the blade 8, even when performing <br/> earth removal work by Rukoto advance the undercarriage 2, a rod with a protective cover 24 2
2 can be reliably covered from above, and the lifting cylinder 1
Rocks, earth and sand, etc., which fall on the top surface 0 are flipped by the cover portion 24B of the protective cover 24 or dropped along the inclined portions 24D to effectively protect the protruding portion of the rod 22. it can.

The cover portion 24B is formed so that the inclined portions 24D and 24D are bent downward in the left-right direction with respect to the central portion 24C and formed in a convex curved shape so as to be strong against bending loads. Etc. fall on the cylinder 21,
Even if a large load acts on the protective cover 24, the protective cover 24 can be prevented from being bent and deformed. Even if the protective cover 24 is bent and deformed, the protective cover 2
4 has a sufficient length to reach the tube 11,
The distal end side of the cover portion 24B abuts on the outer peripheral surface of the tube 11, so that further deformation of the protective cover 24 can be restricted,
The protective cover 24 contacts the rod 22 and the rod body 22
Problems such as damage to A can be solved. Therefore, it is possible to form the protective cover 24 as thin as possible, and it is possible to reduce costs such as material costs.
Various effects are achieved, such as the structure of the protective cover 24 and the like can be simplified, and the workability during assembly can be improved.

Next, FIG. 5 shows a second embodiment of the present invention. In this embodiment, the same reference numerals are given to the same components as those described in the first embodiment, and the description thereof will be omitted. The feature of the present embodiment lies in that the screw seat is formed as long as the diameter of the mounting eye.

In the figure, reference numeral 31 denotes a rod according to the present embodiment, and the rod 31 is the rod 2 described in the first embodiment.
2. Similar to FIG. 2, the rod 31 is substantially composed of a rod body 31A and a mounting eye 31B.
A screw seat 32 is fixedly provided on 1B.

Here, the screw seat 32 is, as shown in FIG.
It is formed in a rectangular shape having a length substantially equal to the diameter of the mounting eye 31B from a thick plate material, and its width dimension is the mounting eye 31B.
B is smaller than the width dimension. The screw seat 3
2 includes a portion corresponding to the center in the length direction and a tube 11.
Two screw holes 32A, 32A in the front part located on the side
The screw seat 32 is attached to the upper surface of the rod body 31A by tangential welding.

As in the first embodiment, a protective cover 24 is fastened to the screw seat 32 via two bolts 25 (not shown).

In this embodiment having the above-described structure, substantially the same operation and effect as those of the first embodiment can be obtained. However, in this embodiment, the length of the screw seat 32 is increased. , The protective cover 24 is formed by the screw seat 32.
Of the protection cover 24 can be more effectively prevented from bending downward, and the cover body 24B of the protection cover 24 can be more effectively prevented. Can be more effectively prevented from rattling due to vibration or the like.

In the above embodiments, the protective cover 24
Of the cover portion 24B, a flat portion 24C having a flat plate shape, and an inclined portion 24 which is bent downward in the left-right direction from the flat portion 24C.
D and 24D have been described as being formed in a convex curved shape, but the present invention is not limited to this, and the cover portion 24B of the protective cover 24 is formed in an arc-shaped cross section so as to be curved along the outer peripheral surface of the tube 11. May be.

[0033]

As described above in detail, according to the first aspect of the present invention, a screw seat is fixed to the rod protruding end side of the lifting cylinder , and the screw seat is provided with a plurality of screw holes spaced apart in the axial direction.
And a plurality of bolts are screwed into each screw hole.
The base end of the protective cover to the protruding end of the rod.
At a plurality of positions , and the tip side of the protective cover is a free end.
Because it was configured to extend to the outer peripheral side of the tube and the coercive
Protective cover on the rod protruding end side with a screw seat and bolts.
And can be fixed in a cantilevered support state,
Can increase the fixing strength of the protective cover.
The tip of the protective cover to the outer circumference of the tube.
To eliminate the need for special guide members, etc.
The mounting structure of the protective cover can be simplified.
You. And, since the earth removal work or the like can cover the large projecting rods from Riue side by the protective cover from the tube, or playing the rocks and sediment falling down on the lifting cylinders by the protective cover, the protective It can be dropped along the outer peripheral surface of the cover, and the projecting portion of the rod can be reliably protected. In addition , even if the protective cover bends and deforms downward due to the weight of the deposited earth and sand, the distal end side of the protective cover abuts the outer peripheral surface of the tube, so that further bending and deformation can be restricted, and the protective cover can be restrained. The outer peripheral surface of the rod can be prevented from being damaged by contact with the rod, and the life of the lifting cylinder can be improved.

According to the second aspect of the present invention, a protective cover is provided.
Of the tube so as to partially cover the outer peripheral surface of the tube.
Since it is formed by bending in the circumferential direction along the outer peripheral surface,
The cross section of the bar becomes convexly curved, and the protective cover is
Can withstand the load from
The sediment deposited on the protective cover is deposited on the outer peripheral surface of the protective cover.
Along with the protective cover depending on the weight of the sediment.
Deflection and deformation can be prevented.

[Brief description of the drawings]

FIG. 1 is a front view showing a lifting cylinder and a protective cover according to a first embodiment of the present invention;

FIG. 2 is a partial plan view showing a state where the lifting cylinder in FIG. 1 is attached to a support bracket of a lower traveling body.

FIG. 3 is an enlarged sectional view taken in the direction of arrows III-III in FIG. 2;

FIG. 4 is an enlarged view of a main part of a rod showing a state where a screw seat is fixed to a mounting eye.

FIG. 5 is an enlarged view of a main part, similar to FIG. 4, showing a second embodiment.

FIG. 6 is an overall view showing a conventional hydraulic excavator.

FIG. 7 is an enlarged view of a main part of the discharging apparatus shown in FIG. 6;

FIG. 8 is a front view showing a lifting cylinder, a protective cover, and the like according to the related art.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Hydraulic excavator main body (working machine main body) 2 Lower traveling body 7 Arm 8 Blade 11 Tube 21 Elevating cylinder 22, 31 Rod 23, 32 Screw seat 24 Protective cover 25 Bolt

Claims (2)

(57) [Scope of request for utility model registration] A work machine body capable of traveling, an arm protruding from the work machine body having a base end rotatably attached to the work machine main body, a distal end side provided at a distal end side of the arm, and a descent. A lifting blade, which is provided between the working machine main body and the arm and is provided with a tube and a rod protruding from the tube so as to lift and lower the blade through an arm at times. in bladed working machine comprising a cylinder, it is secured to the rod projecting end of the lift cylinder, the axial direction
Screw seats with multiple screw holes spaced apart before and after
If, before SL has a maximum elongation even length to reach the tube when the order the rod to protect the protruding portion of the rod, the protective cover extending along the front Symbol tube, in each screw hole of the screw seat Screwed on the proximal end of the protective cover
A plurality of bolts fixed to the screw seat at a plurality of positions spaced apart from each other back and forth and extending to the outer peripheral side of the tube with the distal end side of the protective cover as a free end. With working machine. 2. The working machine with a blade according to claim 1, wherein the protective cover is formed by bending in a circumferential direction along an outer peripheral surface of the tube so as to partially cover an outer peripheral surface of the tube. .