JP2000170205A - Hydraulic piping for working mechanism of hydraulic excavator and discharging structure for earth and sand that fall into vehicle body - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent earth and sand from cumulating and stagnating in a piping deflective deformation space even when hydraulic piping is arranged on a back side of a boom of a working apparatus. SOLUTION: A boom 6 of a working apparatus is connected between a pair of right and left boom hoot pin brackets 11 with a boom hoot pin 12, and a piping deflective deformation space 27 wherein a size of a longitudinal direction of a vehicle body is large is formed between a connecting part of the boom of the working apparatus and a front wall 20 of a back cover body 19. A hydraulic hose 60 is arranged on a back surface 6a of the boom 6 of the working apparatus from a lower position of the boom hoot pin 12 through the piping deflective deformation space 27, and a earth and sand discharging duct is attached on the piping deflective deformation space 27, so that the falling earth and sand is discharged to an outside of the space to prevent from stagnating.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an offset boom type working mechanism having an undulating fulcrum near a turning center position of an upper vehicle body. The working mechanism and a working machine (bucket) mounted on the working mechanism are mounted on an upper body. The present invention relates to a hydraulic excavator that can be folded and turned within the turning radius of a vehicle body, and in particular, has an improved structure related to discharge of fallen earth and sand falling from a hydraulic pipe of a working mechanism and a working machine (hereinafter referred to as a bucket) onto an upper vehicle body. Hydraulic excavator.

[0002]

2. Description of the Related Art Japanese Unexamined Utility Model Publication No. 2-80162 discloses, for example, a structure related to discharge of earth and sand falling from a hydraulic pipe of a working mechanism and a bucket onto an upper vehicle body. Is, for example,
JP-A-37646 and JP-A-6-53371, and JP-A-4-61150 discloses an arrangement in which hydraulic piping is provided along a back surface of a boom from a fulcrum of a working mechanism.

[0003] Japanese Utility Model Application Laid-Open No. 2-80162 discloses that when hydraulic piping is arranged on the rear (rear) side of a boom, the hydraulic piping protects equipment mounted on the upper vehicle body from sediment that falls onto the upper vehicle body due to obstruction. It is disclosed that since a protective cover cannot be provided, the hydraulic piping is disposed on the front side of the boom to provide a soil cover. 4-3
No. 7646 and Japanese Utility Model Laid-Open No. 6-53371 disclose a structure for discharging earth and sand falling around a bracket to which a boom foot pin serving as an up and down fulcrum is attached. No mention is made of the structure used. Japanese Utility Model Laid-Open No. 4-61150 discloses that a hydraulic pipe of a working mechanism is disposed on the back side of a boom. However, it is difficult to prevent the earth and sand falling inside a bracket having a boom foot pin serving as a fulcrum. No mention is made of the emission structure.

[0004]

SUMMARY OF THE INVENTION An offset boom type working mechanism having an undulating fulcrum near a turning center position of an upper body is provided. The working mechanism and a work machine (bucket) mounted on the working mechanism are attached to the upper body. In the case of a hydraulic excavator that can be folded and turned within the turning radius, it is also required that the turning radius of the upper body fit within the body width. They are struggling to reduce the space for onboard equipment to be placed on the vehicle. Then, as a means for narrowing the space, the hydraulic pipe to the working mechanism is changed from the side surface of the boom to the back side to reduce the piping arrangement gap on the side of the boom, thereby achieving a desired object. However, in order to dispose the hydraulic piping on the back side of the boom, as shown in Japanese Utility Model Application Laid-Open No. 4-61150, a boom foot pin serving as a fulcrum of the working mechanism is mounted on the hydraulic piping from below the upper body floor. It is necessary to dispose the space between the brackets, and it is difficult to shield the space between the brackets by the arrangement of the hydraulic piping, and it is impossible to prevent the falling soil from the bucket from entering between the brackets.

As a solution to such a problem, Japanese Utility Model Application Laid-Open No.
As disclosed in Japanese Patent No. 53371, sediment entering between brackets to which a boom foot pin serving as an undulating fulcrum of a working mechanism is attached is provided below the floor between the brackets so that the earth and sand can be discharged below the upper vehicle body. What should I do,
The turning mechanism of the upper body is provided below the bracket of the working mechanism located near the turning center of the upper body, and it is required to provide a sediment discharge port at a position avoiding the turning mechanism. On the other hand, when the hydraulic piping is provided on the back side of the boom, the bending deformation space of the hydraulic piping due to the boom up and down swing is located between the fixed point of the hydraulic piping on the vehicle body side and the fixed point of the boom side. Although it is necessary, the provision of this space has a problem that it becomes a place where sediment falling from the bucket accumulates.

According to the present invention, even if a hydraulic pipe is arranged on the back side of a working machine boom from within a space between boom foot pin brackets of a working mechanism, earth and sand dropped from a bucket accumulate in a pipe bending deformation space of the hydraulic pipe. In order to prevent the earth and sand falling between the boom foot pin brackets from accumulating between the boom foot pin brackets, it can be discharged to the lower side of the upper body avoiding the turning mechanism position of the upper body. It is an object of the present invention to obtain a hydraulic excavator working mechanism hydraulic piping and a body discharge structure for falling earth and sand.

[0007]

According to a first aspect of the present invention, an upper vehicle body 3 is attached to a lower vehicle body 2 provided with a traveling body 1 so as to be freely rotatable by a revolving mechanism 4, and the upper vehicle body 3 is provided in a lateral direction. A pair of left and right boom foot pin brackets 11 and 11 are attached in the front-rear direction of the vehicle body at an interval toward the middle, and a work machine boom 6 is swingably connected between the boom foot pin brackets 11 with a boom foot pin 12. In a hydraulic shovel that can be turned while the working mechanism and the working machine are accommodated within the turning radius of the upper vehicle body 3 as a fulcrum of the mechanism, the equipment storage chamber 15 is located adjacent to one of the left and right sides of the boom foot pin brackets 11. The side wall 16a is erected, and the side wall 5a of the cab 5 is erected adjacent to the other side to form a boom undulating space 26 above the space between the boom foot pin brackets 11,11. In both cases, the front wall 20 of the engine storage room 18 is erected adjacent to the rear end portions of the boom foot pin brackets 11, 11 between the boom foot pin 12 and the front wall 20 of the engine storage room 18. A pipe bending deformation space 27 connected to the undulating space 26 is formed, and the pipe bending deformation space 27 is opened between the boom foot pins 12 and the front wall 20 of the engine storage chamber 18 between the boom foot pin brackets 11. Inside the opened boom foot pin bracket 11, there is provided a sediment discharge duct 51 that connects the boom up / down space 26 and the pipe deformation space 27 to the lower side of the upper vehicle body, and a space 28 for hydraulic piping, and is close to the boom foot pin 12. The middle part of the hydraulic piping is fixed and held inside the boom foot pin bracket interval
The middle of the hydraulic pipe is fixedly held at a position near the boom foot pin 12 and the hydraulic pipe is worked so that the hydraulic pipe is curved and positioned in the pipe bending deformation space 27 between the fixed holding. The hydraulic excavator has a working mechanism hydraulic pipe disposed on the rear side of the machine boom 6 and a structure for discharging the fallen soil from the vehicle body.

According to the first aspect, the boom undulation space 26 is provided.
Since the space following the pipe bending deformation space 27 is connected to the lower side of the upper vehicle body through the sediment discharge duct 51, even if the hydraulic pipe is arranged on the back side of the work equipment boom, the sediment stays in the pipe bending deformation space 27. There is no.

According to a second aspect of the present invention, in the first aspect, the earth and sand discharge duct 51 is connected to the receiving port 32a facing the pipe bending deformation space 27, the inclined bottom wall 33, and the discharge port 32b below the inclined wall 33. And a discharge communication port 50 which is opened to the boom foot pin bracket 11 on one side and which communicates with the discharge port 32b of the falling sediment receiving box 32.
And a sediment discharge box 45 that is located outside the one-sided boom foot pin bracket 11 with the discharge communication port 50 opened, and discharges the sediment from the discharge communication port 50 to a location farther than the outer periphery of the turning mechanism 4. Hydraulic excavator work mechanism Hydraulic piping and a structure for discharging the sediment falling from the vehicle body.

According to the second aspect, it is possible to discharge the earth and sand to a position where the turning mechanism 4 is avoided.

A third aspect of the present invention is the hydraulic shovel according to the second aspect of the present invention, wherein the earth and sand discharge guide 30 is mounted from below the mounting portion of the work implement boom 6 to the front between the pair of left and right boom foot pin brackets 11.

According to the third aspect, the earth and sand that has fallen forward of the mounting portion of the work machine boom 6 between the pair of left and right boom foot pin brackets 11 is the earth and sand discharge guide 30.
, And does not accumulate between the pair of left and right boom foot pin brackets 11.

[0013]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS As shown in FIG. 1, an upper vehicle body 3 is attached to a lower vehicle body 2 provided with a traveling body 1 so as to be pivotable by a pivot mechanism 4. A driver's cab 5 is attached to the upper body 3, and a work implement boom 6 is attached to be able to swing up and down toward the front. The work machine boom 6 has an offset boom structure, and an arm 7 is connected to the tip of the work machine boom so as to be able to swing up and down to form an offset boom type working mechanism having a fulcrum near a turning center position of the upper vehicle body. A working machine, for example, a bucket 8 is attached to the upper and lower swingable to form a hydraulic excavator which is capable of turning the working mechanism and the working machine within the turning radius of the upper body.

A boom cylinder 9 is connected to the work machine boom 6 and the upper body 3, and by expanding and contracting the boom cylinder 9, the work machine boom 6 swings up and down to a vertical posture as shown by a virtual line. It is tiltable to the rear of the vehicle from A.

The upper body 3 has a bottom plate 10 as shown in FIGS. 2, 3 and 4, and a pair of left and right booms in the form of a vertical plate facing the front and rear direction of the vehicle at a position between the bottom plate 10 and the left and right, toward the front. Foot pin brackets 11, 11 are fixed at intervals. A work machine boom 6 is attached to the upper part between the pair of left and right boom foot pin brackets 11, 11 so as to be vertically swingable with a boom foot pin 12, and serves as a fulcrum, and the front end of the pair of left and right boom foot pin brackets 11. The boom cylinder 9 is attached to the part so as to be able to swing up and down by a pin 13. The boom foot pin 12 and the bottom plate 10 are separated.

The operator's cab 5 is mounted on one of the left and right sides of the upper body 3. The side wall 5a of the operator's cab 5 is close to (or may be in contact with) one of the boom foot pin brackets 11, and the side wall 5a is on one side. It stands adjacent to the boom foot pin bracket 11. The bottom wall of the operator's cab 5 and the bottom plate 10 are vertically separated from each other, and a valve 14 and the like are provided in that portion. An equipment storage room 15 is provided on the other side of the upper body 3.
The side wall 16a of the side cover body 16 forming the device storage chamber 15 is in contact with the other boom foot pin bracket 11 on the left and right sides. The upper surface of the side cover body 16 has an opening that is opened and closed by a lid 17. The side wall 16a stands adjacent to the other boom foot pin bracket 11.

An engine compartment 18 is formed near the rear of the upper body 3. A portion (hereinafter referred to as a front wall 20) between the cab side wall 5a and the side cover body side wall 16a on the front surface 19a of the rear cover body 19 forming the engine storage chamber 18 is perpendicular to the vertical as shown in FIG. The upper cross plate 23 is fixed to the lower cross plate 24 by bolts 25, and the upper cross plate 23 is fixed to the lower cross plate 24 by bolts 25. I have. The mounting cross member 24 is fixed across the upper surfaces of the pair of left and right boom foot pin brackets 11.

The cab side wall 5a (one boom foot pin bracket 11), the side cover body side wall 16a (the other boom foot pin bracket 11), and the rear cover 1
The 9 front wall 20 forms a boom-shaped up-and-down space 26 having a U-shape in plan view that is open to the front of the vehicle body. A longitudinal dimension of the vehicle body between the front wall 20 and the boom foot pin 12 is large, and a large pipe deflection between the front wall 20 and the mounting portion (the boom foot pin 12) of the work machine boom 6 in the longitudinal direction of the vehicle body. A deformation space 27 is formed. The pipe bending deformation space 27 and the boom foot pin 12 are located above the ring gear 4a forming the turning mechanism 4 as shown in FIG. The pipe bending deformation space 27 communicates with a pipe space 28 between the mounting portion of the work implement boom 6 and the bottom plate 10 between the pair of left and right boom foot pin brackets 11.

A earth and sand discharge guide 30 is attached to a front portion of the vehicle body between the pair of left and right boom foot pin brackets 11. The earth and sand discharge guide 30 is plate-shaped and has a front end 3.
0a is in contact with the front end of the bottom plate 10, and the rear end 30b is close to the boom foot pin 12 and the front side of the vehicle body is inclined lower than horizontal. That is, the earth and sand discharge guide 30 is attached to be inclined from the position below the boom foot pin 12 to the front end.

As a result, the earth and sand that has fallen from the foot pin 12 to the front portion between the pair of left and right boom foot pin brackets 11 falls onto the earth and sand discharge guide 30 and is discharged to the front of the vehicle body. The earth and sand discharge guide 30 has a hole 31 through which the hydraulic piping of the boom cylinder 9 is inserted. Specifically, a large opening 3 is formed in the earth and sand discharge guide 30.
1a, and a cover 31b that covers most of the opening 31a is removably attached to the cover 31b and the opening 31a.
and a. Thereby, the cover 3
By removing 1b, the hydraulic piping can be attached to and detached from the boom cylinder 9 through the large opening 31a. The rear cover body 19 has an opening formed by a lid 29.

A falling sediment receiving box (duct) 32 is attached to a portion on the vehicle body rear side of the boom foot pin 12 between the pair of left and right boom foot pin brackets 11 (ie, a position below the pipe bending deformation space 27). is there. As shown in FIG. 5, the falling sand box 32 has a bottom wall 33 and a vertical wall 34 on one side.
The other vertical wall 35 has a substantially U-shaped cross section, and the bottom wall 33 is oblique in the left-right direction and has a receiving port 32a and a discharging port 32b. The upper side of the one-side vertical wall 34 is inclined obliquely upward, and a notch 36 having a flat U-shape is formed at the tip end surface, and a hole 37 is formed. The upper end of the other side vertical wall 35 is horizontal and has a semicircular cutout 38 and a hole 39 formed therein. As shown in FIG. 4, FIG. 6, and FIG. 7, seal materials 40 are mounted on the left and right end surfaces of the falling sediment receiving box 32, and these seal materials 40 are crimped on the opposed inner surfaces of the pair of left and right boom foot pin brackets 11. I have to do it.

The bolt 41 is attached to the boom foot pin bracket 11 through the hole 37 of the vertical wall 34 on one side of the falling sediment receiving box 32.
Is screwed into a nut member 42 fixed to the inner surface of
The bolt 43 is screwed into the mounting horizontal plate 24 through the hole 39 of No. 5 to be mounted. At this time, the bolt 25 is
To avoid interference.

A sediment discharge port 44 is formed on the bottom plate 10 at a position facing the falling sediment receiving box 32 and not interfering with the ring gear 4a, and a sediment discharging box (shooter) is formed at an opening edge of the sediment discharging port 44. 45 is attached. As shown in FIG. 5, the earth and sand discharge box 45 has a mounting piece 47 integrally provided at a lower end edge of the cylindrical portion 46, and an upper portion of one side of the cylindrical portion 46 projects sideward to form a soil and sand inlet portion 48. ing.

As shown in FIG. 4, the mounting piece 47 is
The earth and sand inlet portion 48 protrudes inward from a discharge communication port 50 formed in the boom foot pin bracket 11. The lower part of the falling sediment receiving box 32 is fitted into the sediment inlet 48, and the inside of the falling sediment receiving box 32 (discharge port 32b) and the inside of the sediment discharging box 45 (sediment inlet 48).
Is continuous. This forms the earth and sand discharge duct 51. The earth and sand discharge duct 51 is used for the work equipment boom 6.
And a sediment outlet 53 that is continuous with the sediment inlet 52 and the sediment discharge outlet 44 that face each other.

As described above, when the working machine boom 6 is tilted rearward from the vertical posture to the rear side of the vehicle body, the soil and the like that has fallen behind the boom foot pin 12 in the boom hoisting space 26 behind the vehicle body are fallen sediment receiving boxes. 32, it is dropped and discharged from the earth and sand discharge port 44 through the earth and sand discharge box 45. In addition, the earth and the like which are dropped and discharged are discharged outside the turning mechanism 4,
No earth and sand enter the turning mechanism 4.

A hydraulic pipe, for example, a hydraulic hose 60 connected directly or via a pipe to the valve 14 shown in FIG. 2 passes through the opening window 61 of one boom foot pin bracket 11 as shown in FIG. And is held by a hose clamp 62 at a rear end portion 30 b (a position below the boom foot pin 12) of the earth and sand discharge guide 30, and is bent and deformed through the notch 36 of the one side vertical wall 34 of the falling earth and sand receiving box 32. The work machine boom 6 is held by a hose clamp 63 near a lower portion of the back surface 6a through the space 27. The end of the hydraulic hose 60 is connected to a hydraulic pipe 64 disposed along the back surface 6a of the work implement boom 6. The pipe may project from the opening window 61 into the piping space 28. That is, the hydraulic hose 60 may be connected to the valve 14 side. The hydraulic piping 64 may be a pipe or a hose.

As described above, the hydraulic hose 6 is mounted in a state where the work implement boom 6 is tilted rearward from the vertical position toward the rear of the vehicle body.
0 can be largely bent in the longitudinal direction of the vehicle body in the pipe bending deformation space 27, and the hydraulic hose 60 is not damaged by the bending. When the working machine boom 6 is tilted forward, the bent hydraulic hose 60 becomes straight, and when the working machine boom 6 is further tilted forward, the hydraulic hose 60 bends in an arc around the boom foot pin 12 (working machine boom swing center). 6
0 is not damaged.

That is, since the pipe bending deformation space 27 having a large size in the longitudinal direction of the vehicle body is formed, the length of the hydraulic hose 60 between the hose clamp 62 and the hose clamp 63 is reduced in a state where the work machine boom 6 is inclined most forward. The hydraulic hose 60 is bent and deformed to a size that does not damage the hydraulic hose 60 in the pipe bending deformation space 27 when the work machine boom 6 is tilted backward from the vertical posture toward the rear of the vehicle body. Can bend.

Next, a second embodiment of the earth and sand discharge duct will be described with reference to FIGS. 8, 9 and 10. FIG. A mounting vertical piece 34a is provided on the falling earth and sand receiving box 32, and the mounting vertical piece 34a is fixed to the boom foot pin bracket 11 with a bolt 41. The other vertical wall 35 is attached by screwing a bolt 43 to a nut member 35a fixed to the boom foot pin bracket 11. A mounting piece 47 is provided on the upper edge of the cylindrical portion 46 of the earth and sand discharge box 45, and the mounting piece 47 is mounted on the boom foot pin bracket 11 with a bolt 49. The cylindrical portion 46 is slanted in the left-right direction, and a sediment outlet portion (a discharge port 32b portion) of the falling sediment receiving box 32 is fitted into the sediment inlet portion 48 so that the bottom wall 33 is aligned with the bottom surface 46a of the cylindrical portion 46. It is continuous. By doing so, the earth and sand can be discharged smoothly.

[Brief description of the drawings]

FIG. 1 is a front view of a hydraulic excavator.

FIG. 2 is a plan view of an upper vehicle body.

FIG. 3 is a front view in which a work machine boom mounting portion of an upper body is broken.

FIG. 4 is a left side view of the earth and sand discharge duct portion.

FIG. 5 is a perspective view of the earth and sand discharge duct.

FIG. 6 is an enlarged view of a boom foot pin bracket part of FIG. 2;

FIG. 7 is an enlarged view of a boom foot pin bracket part of FIG. 3;

FIG. 8 is a plan view showing a second embodiment of the earth and sand discharge duct.

FIG. 9 is a sectional view showing a second embodiment of the earth and sand discharge duct.

FIG. 10 is a left side view showing a second embodiment of the earth and sand discharge duct.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Running body 2 ... Lower body 3 ... Upper body 4 ... Revolving mechanism 5 ... Operating room 5a ... Side wall 6 ... Work implement boom 6a ... Back surface 10 ... Bottom plate 11 ... Boom foot pin bracket 12 ... Boom foot pin 15 ... Equipment storage room 16a ... side wall 18 ... engine storage room 20 ... front wall 26 ... boom undulating space 27 ... pipe bending deformation space 28 ... piping space 30 ... earth and sand discharge guide 32 ... falling earth and sand receiving box 32a ... receiving port 32b ... discharge port 33 ... bottom Wall 44: Sediment discharge port 45: Sediment discharge box 50: Discharge communication port 51: Sediment discharge duct 52: Sediment inlet 53: Sediment outlet 60: Hydraulic hose (hydraulic piping) 62: Hose clamp 63: Hose clamp 64: Hydraulic piping

Claims (3)

[Claims] An upper vehicle body (3) is attached to a lower vehicle body (2) having a traveling body (1) by a revolving mechanism (4) so as to be freely rotatable.
A pair of left and right boom foot pin brackets (11) are attached in the front-rear direction of the vehicle body at an interval near the middle in the left-right width direction of the upper vehicle body (3), and a working machine is interposed between the boom foot pin brackets (11). A hydraulic excavator in which the boom (6) is swingably connected by a boom foot pin (12) to serve as an up and down fulcrum of the working mechanism, and the working mechanism and the working machine can be turned within the turning radius of the upper body (3). A side wall (16a) of the equipment storage room (15) adjacent to one of the left and right sides of the boom foot pin brackets (11), (11).
And the side wall (5a) of the cab (5) adjacent to the other side
And set the boom foot pin bracket (11), (1
A boom undulation space (26) is formed on the upper side between the intervals 1), and the boom foot pin bracket (11),
The front wall (20) of the engine storage room (18) is erected near the rear end of the vehicle body of (11), and the boom foot pin (1) is set up.
A pipe bending deformation space (27) connected to the boom undulation space (26) is formed between the boom foot pin (12) and the engine storage room between the 2) and the front wall (20) of the engine storage room (18). A space between the boom foot pin bracket (11) and the front wall (20) of (18) is opened in the pipe bending deformation space (27), and the inside of the opened boom foot pin bracket (11). Boom undulating space (2
6) A sediment discharge duct (51) that connects the pipe bending deformation space (27) to the lower side of the upper vehicle body, and a hydraulic pipe space (2).
8) is provided to fix and hold an intermediate portion of the hydraulic pipe in the space between the boom foot pin brackets adjacent to the boom foot pin (12), and to provide a hydraulic pipe at a position near the boom foot pin (12) of the work machine boom (6). The hydraulic pipe is fixedly held in the middle part of the working machine boom (6) so that the hydraulic pipe is curved and positioned in the pipe bending deformation space (27) between the fixed holding. Hydraulic piping for the working mechanism of the hydraulic excavator installed and a structure for discharging sediment falling from the vehicle. 2. A sediment discharge duct (51) having a receiving port (32a) facing the pipe bending deformation space (27), a slanted bottom wall (33), and a lower discharge port of the slanted bottom wall (33). 32b), and opened on one side of the boom foot pin bracket (11).
A discharge communication port (50) communicating with a discharge port (32b) of the falling sediment receiving box (32), and a single-sided boom foot pin bracket (11) provided with the discharge communication port (50); A sediment discharge box (4) that discharges sediment from the discharge communication port (50) to a location away from the outer periphery of the turning mechanism (4).
5. The hydraulic excavator working mechanism hydraulic piping and the vehicle body discharge structure according to claim 1, wherein 3. The hydraulic excavator according to claim 2, wherein a sediment discharge guide (30) is attached to a portion between the pair of left and right boom foot pin brackets (11) from below a mounting portion of the work implement boom (6) and forward. Work mechanism Hydraulic piping and body discharge structure for falling earth and sand.