JPH0860699A - Hydraulic joint of excavation work machine - Google Patents

Abstract

PURPOSE: To prevent a hydraulic hose from being twisted or oil leakage from a connected part by communicating a swing frame side hydraulic pipeline and an in-bracket oil passage independently by way of a vertical axle oil groove and an in-vertical-axle oil passage. CONSTITUTION: A boom bracket 7 is pivoted turnably on both ways by way of a vertical axle 70 which runs through the front end of a swing frame 4 vertically. The base end of a boom is pivoted turnably vertically by way of a boom support horizontal axle 71 which runs through the top of the bracket 7. The lower end of a boom operation hydraulic cylinder is pivoted turnably by way of a cylinder support axle 72 which runs through the front lower part of the bracket 7. Furthermore, a plurality of frame side hydraulic pipelines 14 and in-boom bracket oil passages 75 are communicated independently by way of vertical axle oil grooves 73 on the outer periphery of the axle 70 and in-vertical axis oil grooves 74 inside the axle 70.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a hydraulic joint for an excavator.

[0002]

2. Description of the Related Art Conventionally, in a hydraulically driven excavation work section equipped in an excavation work machine or the like, members such as a boom, an arm, and a bucket are connected to the work machine body so that they can be bent in the above-mentioned order. Many hydraulic hoses are used in hydraulic pipes for supplying hydraulic pressure to hydraulic actuators for operating these members, and for supplying hydraulic pressure beyond the connecting portions of the respective members.

[0003]

However, the direction of the joint of the hydraulic hose is limited in order to prevent the bending of the hydraulic hose due to the movement between the respective members from being unreasonable. There are many threaded joints between each part due to the complexity of the structure, which requires many parts to orient, and the transmission of hydraulic pressure through many parts. The probability of leakage increases,
Further, there is a problem that the hydraulic hose is twisted by the operation of each member.

Further, since the hydraulic hose is exposed to the outside, it is easily damaged by contact with an obstacle or the like, and deteriorates due to sunlight or oxidation to cause cracks, which causes a problem in durability. .

[0005]

SUMMARY OF THE INVENTION In the present invention, a boom support horizontal pivot having a boom bracket pivotably attached to the left and right through a vertical pivot having a front end of a revolving frame inserted therein and having an upper portion of the boom bracket inserted therethrough. The base end of the boom is rotatably pivoted vertically via, and the lower end of the hydraulic cylinder for boom operation is pivotally rotatably pivoted via a cylinder supporting horizontal pivot that is inserted through the lower front portion of the boom bracket. In an excavating work machine in which the excavation work section is rotatable left and right and up and down, a plurality of vertical pivot oil grooves formed on the outer circumference of the vertical pivot and a plurality of vertical pivot oil grooves formed inside the vertical pivot so as to communicate with the same. A plurality of frame-side hydraulic pipes on the turning frame side are made to independently communicate with the oil passage in the vertical axis of
Four cylinder support horizontal pivot oil grooves formed on the outer periphery of the cylinder support horizontal pivot in the vertical pivot oil groove, and two cylinders formed inside the cylinder support horizontal pivot in communication with the cylinder support horizontal pivot oil groove An oil passage in the supporting horizontal pivot shaft is appropriately communicated with the oil passage, and the reciprocating oil passages of the boom actuating hydraulic cylinder are independently communicated with the cylinder support horizontal pivot oil groove, while the vertical pivot oil groove is connected. A plurality of boom supporting horizontal pivot oil grooves formed on the outer circumference of the boom supporting horizontal pivot, and a boom supporting horizontal pivot oil passage formed inside the boom supporting horizontal pivot in communication with the boom supporting horizontal pivot oil grooves, Provided is a hydraulic joint for an excavator, which is characterized in that a plurality of boom-side hydraulic pipes are independently communicated with the boom supporting horizontal pivot oil groove, respectively, by communicating them through appropriately arranged oil passages. Is shall.

On the upper surface of the front end of the revolving frame, a base having a circular cross section with the axis center vertical is erected, and a revolving unit is rotatably fitted on the base so that the revolving unit has a cross section. A circular shaft body is rotatably inserted with the shaft center horizontal, and the base upper and lower oil grooves are formed at a predetermined interval on the outer peripheral surface of the base to form the base upper and lower oil grooves, respectively. The base left and right oil holes formed on the end surface of the shaft are communicated with each other through the base left and right oil passages formed inside the base, and the shaft left and right oil grooves are formed at a predetermined distance on the outer peripheral surface of the shaft, The shaft left and right oil grooves communicate with the shaft left and right oil holes formed on the end faces of the shaft through the shaft left and right oil passages formed inside the shaft, and the base upper and lower oil grooves respectively It is also characterized in that it communicates with the left and right oil grooves of the shaft body through a passage.

[0007]

Embodiments of the present invention will be described with reference to the drawings.

FIG. 1 shows a main part of an excavating work machine B equipped with a hydraulic joint A according to the present invention. The excavating work machine B has a swivel base 3 on a traveling frame 2 equipped with a crawler 1. The slewing frame 4 is erected vertically, and the slewing frame 4 is rotatably mounted on the upper surface of the slewing base 3. The operating section 5 is mounted on the central portion of the upper surface of the slewing frame 4, and a prime mover section (not shown) is provided behind it. It is installed.

An excavation work section 6 is connected to the front end of the revolving frame 4, and the excavation work section 6 is connected to the revolving frame 4.
The boom bracket 7 is swingably connected to the front end of the boom bracket 7, and the base end of the boom 8 which is bent in a substantially V shape is pivotally attached to the upper end of the boom bracket 7 so as to be vertically rotatable. A boom actuating hydraulic cylinder 9 is interposed between the lower part of the boom 8 and the middle part of the boom 8, and the base end of the arm 10 is pivotally attached to the tip of the boom 8 so as to be vertically rotatable. An arm actuating hydraulic cylinder 11 is provided between the arm 10 and the rearward extending portion of the arm 10, and a bucket is provided at the tip of the arm 10.
The lower part of the rear end of 12 is pivotally mounted, and the bucket operating hydraulic cylinder 13 is provided between the upper surface of the middle part of the arm 10 and the upper part of the rear end of the bucket 12.
The excavation work unit 6 is operated by interposing the above.

2 to 6 show a hydraulic joint A1 according to the first embodiment of the present invention, which is provided between the frame side hydraulic pipe 14 of the swing frame 4 and the boom side hydraulic pipe 15 of the excavation work section 6. As shown in FIGS. 2 to 4, the boom bracket 7 is rotatably pivoted to the left and right through a vertical pivot 70 that passes through the front end of the revolving frame 4 vertically. The base end of the boom 8 is rotatably pivoted vertically via a boom support horizontal pivot 71 that passes through the upper portion of the bracket 7.
The lower end of the boom actuating hydraulic cylinder 9 is rotatably pivoted via a cylinder supporting horizontal pivot 72 that penetrates the lower front surface of the boom bracket 7 so that the excavation work unit 6 can be rotated left and right and up and down.

2 to 4, a plurality of vertical pivot oil grooves 73 formed on the outer periphery of the vertical pivot 70, and a plurality of vertical pivot oil passages 74 formed inside the vertical pivot 70. Through a plurality of frame side hydraulic pipes 14 on the turning frame 4 side and a plurality of boom bracket internal oil passages 75 formed inside the boom bracket 7 as appropriate oil passages. I am letting you.

Incidentally, as the properly arranged oil passage, a hydraulic pipe separate from the boom bracket may be used.

Further, as shown in FIGS. 2 to 4, four cylinder support horizontal pivot oil grooves 76 formed on the outer periphery of the cylinder support horizontal pivot 72, and two cylinder support horizontal pivot oil grooves formed inside the cylinder support horizontal pivot 72. Through the cylinder support horizontal pivot shaft internal oil passages 77, 77, the two boom bracket internal oil passages 75 ... And the reciprocating oil passages 78, 79 of the boom operating hydraulic cylinder 9 are independently communicated with each other. .

As shown in FIG. 2, FIG. 3, FIG. 5 and FIG. 6, a plurality of boom supporting horizontal pivot oil grooves are formed on the outer circumference of the boom supporting horizontal pivot 71 with other boom bracket oil passages 75. 80, and a plurality of boom supporting horizontal pivot internal oil passages 81 formed inside the boom supporting horizontal pivot 71, respectively, are independently communicated with the boom side hydraulic pipes 15.

With such a construction, the boom side hydraulic pipe 15 disposed on the boom 8 which can be rotated left and right and up and down without using a hydraulic hose which tends to cause problems such as twisting, oil leakage, and cracks due to fatigue and deterioration. … And frame side piping 14
The hydraulic oil can be sent to each hydraulic equipment of the excavation work section 6 by communicating with the hydraulic fluid.

7 and 8 show a hydraulic joint A2 of the second embodiment of the present invention, which is arranged between the frame side hydraulic pipe 14 of the swing frame 4 and the boom side hydraulic pipe 15 of the excavation work unit 6. At the rear of the boom bracket 7 on the upper surface of the revolving frame 4, a base 16 having a circular cross-section with a vertical axis is set upright via a mounting flange 17 formed integrally with the base 16. Then, a revolving unit 20 having a substantially rectangular front portion 18 formed on the base 16 is rotatably fitted outside, and the revolving unit 20 is prevented from coming off by the upper and lower stop rings 21, 21. Shaft part 18
22 has a shaft centered horizontally and is rotatably inserted, and left and right retaining rings 23, 23 prevent slipping off.

Base upper and lower oil grooves 24, 25 are formed on the outer peripheral surface of the base 16 at a predetermined interval, and the base upper and lower oil grooves are formed.
24 and 25 are the base left and right oil passages 26 and 27 formed in the upper end surface of the base 16, respectively, and the base left and right oil passages 2 formed inside the base 16
It communicates via 8,29.

Also, shaft body left and right oil grooves 30 and 31 are formed on the outer peripheral surface of the shaft body 22 at a predetermined interval, and the shaft body left and right oil grooves 30 and 31 are respectively left and right of the shaft body 22. The shaft body left and right oil holes 32, 33 formed in the end face communicate with each other through shaft body left and right oil passages 34, 35 formed in the shaft body 22.

The base upper and lower oil grooves 24 and 25 communicate with the shaft left and right oil grooves 30 and 31 via the revolving inside left and right oil passages 36 and 37, respectively.

The base left and right oil holes 26, 27 and the shaft body left and right oil holes
Tapered female threads are formed on 32 and 33. In the figure,
38 is an O-ring and 39 is a mounting bolt.

The base left and right oil holes 26 and 27 are connected to the reciprocating hydraulic pipes 40 and 41 on the revolving frame 4 side, respectively, and the shaft body left and right oil holes 32 and 33 are respectively passing through the reciprocating hydraulic hoses 42 and 43. , Is connected to and connected to a connection block 44 mounted on the upper surface of the base end of the boom 8.

With this configuration, the hydraulic hoses 42, 43
The number of parts for connecting
Since the shaft body 22 is rotatable around two vertical and horizontal orthogonal axes with respect to 16, the direction can be freely changed in accordance with the swing and the movement of the base end of the boom 8 which rotates vertically. Therefore, it is possible to prevent the hydraulic hoses 42 and 43 from being twisted or forcedly bent.

FIG. 9 and FIG. 10 show a third embodiment,
The hydraulic joint A3 for use between members that relatively rotate about an axis is shown, and a shaft body 52 having a hexagonal head 51 formed at one end is rotatably inserted into one side of a substantially rectangular plate-shaped substrate 50. Then, a retaining ring 53 fitted on the other end is used to prevent it from coming off.

An oil groove 54 is formed on the outer peripheral surface of the shaft body 52, and the oil groove 54 is formed in the shaft body oil hole 56 formed on the end surface of the shaft body 52 on the side of the hexagon head 51 through the oil passage 55 in the shaft body. While communicating
The oil groove 54 is communicated with a substrate oil hole 58 formed on the left side of the substrate 50 through an oil passage 57 in the substrate. Two such communication structures are provided in the substrate 50 to accommodate pressure oil reciprocation. I am able to do it.

Tapered female screws are formed in the shaft oil hole 56 and the base plate oil hole 58. In the figure, 59 is an O-ring, 60
Is a blind plug.

With this structure, the shaft body is provided with respect to the substrate 50.
Since the 22 is rotatable, for example, the boom 8 and the arm 10
Can be used between the hydraulic hoses 42 and 43, or between the arm 10 and the bucket 12, and in this case as well, the shaft 52 can be rotated in accordance with the movement of the members, so that the hydraulic hoses 42 and 43 are not twisted or forced to bend. Can be prevented.

[0027]

According to the present invention, the boom bracket is pivotally attached to the left and right through a vertical pivot through which the front end of the revolving frame is inserted, and the boom support horizontal pivot through which the upper portion of the boom bracket is inserted. The boom base end is pivotally pivoted up and down, and the lower end of the boom actuating hydraulic cylinder is pivotally pivoted through a cylinder support horizontal pivot that is inserted through the lower front part of the boom bracket for excavation work. In an excavating work machine whose parts are rotatable left and right and up and down, a plurality of vertical axis oil grooves formed on the outer periphery of the vertical axis and a plurality of vertical axes formed inside the vertical axis in communication with the vertical axis oil grooves. A plurality of frame-side hydraulic pipes on the turning frame side are independently connected to the in-axis oil passage, and four cylinder supporting horizontal pivots formed on the outer periphery of the cylinder supporting horizontal pivot in the vertical pivot oil groove. An oil groove and two cylinder support horizontal pivot shaft internal oil passages formed in the cylinder support horizontal pivot shaft by communicating with the cylinder support horizontal pivot shaft oil groove are communicated through appropriate oil passages to provide a cylinder support horizontal The reciprocating oil passages of the boom actuating hydraulic cylinder are independently communicated with the pivot oil groove, while the vertical pivot oil groove is provided with a plurality of boom supporting horizontal pivot oil grooves formed on the outer periphery of the boom supporting horizontal pivot and the same boom. A boom supporting horizontal pivot oil passage formed in the boom supporting horizontal pivot by communicating with the supporting horizontal pivot oil groove is communicated with an oil passage in the boom supporting horizontal pivot shaft through an oil passage that is appropriately arranged. By connecting the side hydraulic pipes independently of each other, the boom side hydraulic pipes and frame side pipes, which are arranged on the boom that can be rotated left and right and up and down, are communicated with each other without using a hydraulic hose. Since pressure oil can be supplied to each hydraulic device in the working part, problems such as kinks, oil leaks, and cracks due to fatigue and deterioration are likely to occur. It is possible to fundamentally solve problems such as cracks due to deterioration.

On the upper surface of the front end of the revolving frame, a base having a circular cross section with its axis centered vertically is erected, and a revolving unit is rotatably fitted on the base so that the revolving frame has a cross section. A circular shaft body is rotatably inserted with the shaft center horizontal, and the base upper and lower oil grooves are formed at a predetermined interval on the outer peripheral surface of the base to form the base upper and lower oil grooves, respectively. The base left and right oil holes formed on the end surface of the shaft are communicated with each other through the base left and right oil passages formed inside the base, and the shaft left and right oil grooves are formed at a predetermined distance on the outer peripheral surface of the shaft, The shaft left and right oil grooves communicate with the shaft left and right oil holes formed on the end faces of the shaft through the shaft left and right oil passages formed inside the shaft, and the base upper and lower oil grooves respectively By communicating with the left and right oil grooves of the shaft body via the passage, the number of parts for connecting the hydraulic hose can be greatly reduced, and the shaft body is Since it is rotatable about two vertical and horizontal axes that are orthogonal to each other, it is possible to freely change the direction in accordance with the swing and the movement of the boom base end that rotates vertically. It is possible to prevent twisting and forcible refraction.

[Brief description of drawings]

FIG. 1 is a side view of a main part of an excavating work machine equipped with a hydraulic joint of the excavating work machine according to the present invention.

FIG. 2 is a side view of the hydraulic joint according to the first embodiment of the present invention.

FIG. 3 is a cutaway side view of the same portion.

FIG. 4 is a cross-sectional view taken along the line I-I in FIG. 7.

FIG. 5 is a plan view of the same.

FIG. 6 is a cutaway plan view of the same portion.

FIG. 7 is a partial cross-sectional plan view of a hydraulic joint according to a second embodiment.

FIG. 8 is a sectional side view of the same.

FIG. 9 is a plan view of a hydraulic joint according to a third embodiment.

FIG. 10 is a sectional side view of the same.

[Explanation of symbols]

 A1 First embodiment Hydraulic joint B Excavator 4 Swivel frame 16 Base 20 Swivel 22 Shaft 24 Base upper oil groove 25 Base lower oil groove 26 Base left oil hole 27 Base right oil hole 28 Base Inner left oil passage 29 Base right oil passage 30 Shaft left oil groove 31 Shaft right oil groove 32 Shaft left oil hole 33 Shaft left oil hole 34 Shaft inner left oil passage 35 Shaft inner right oil passage 36 Swing body Left oil passage 37 Right oil passage in the turning body

Claims (2)

[Claims] 1. A boom bracket (7) is rotatably pivoted left and right through a vertical pivot (70) through which a front end of a revolving frame (4) is inserted, and an upper part of the boom bracket (7) is inserted through the boom bracket (7). The base end of the boom (8) is pivotally mounted vertically via a boom support horizontal pivot (71), and the boom is operated via a cylinder support horizontal pivot (72) that is inserted through the lower front part of the boom bracket (7). Rotatably pivot the lower end of the hydraulic cylinder (9) for
In the excavator (B) in which the excavation work section (6) can be rotated left and right and up and down, a plurality of vertical pivot oil grooves formed on the outer periphery of the vertical pivot (70)
(73) ... and the same vertical pivot oil groove (73).
In the plurality of vertical in-axis oil passages (74) formed inside (70),
Plural frame-side hydraulic pipes (14) on the swivel frame (4) side…
And the four cylinder support horizontal pivot oil grooves (76) formed on the outer periphery of the cylinder support horizontal pivot shaft (72) in the vertical pivot oil groove (73). Two cylinder support horizontal in-axis oil passages (77), (77) formed inside the cylinder support horizontal pivot (72) in communication with the pivot oil groove (76) ... To communicate,
The reciprocating oil passages (78) and (79) of the boom operating hydraulic cylinder (9) are independently communicated with the cylinder supporting horizontal pivot oil groove (76), while the vertical pivot oil groove (73) is connected to the vertical pivot oil groove (73). Inside the boom supporting horizontal pivot (71), the boom supporting horizontal pivots (71) are communicated with a plurality of boom supporting horizontal pivot oil grooves (80) formed on the outer periphery of the boom supporting horizontal pivot (71). The boom supporting horizontal pivot oil passage (81) formed in the above is communicated with the boom supporting horizontal pivot oil groove (80) by a plurality of boom side hydraulic pipes (15). The hydraulic joint of the excavator is characterized by communicating with each other independently. 2. In an excavating work machine (B) in which a base end of an excavation work section (6) is rotatably connected to a revolving frame (4), a shaft center is perpendicular to an upper surface of a front end portion of the revolving frame (4). The base (16) with a circular cross section is erected, and the revolving structure (20) is rotatably fitted on the base (16) so that the revolving structure (20) has a circular cross section. (twenty two)
Rotatably with the shaft center horizontal, and at the predetermined intervals on the outer peripheral surface of the base (16) to form the base upper and lower oil grooves (24) and (25). Left and right oil passages in the base formed in the base (16) in the base left and right oil holes (26) and (27) in which grooves (24) and (25) are formed on the end faces of the base (16), respectively. 28), (29),
Maintain a predetermined distance on the outer peripheral surface of the shaft (22),
0), (31) and the shaft body left and right oil grooves (30), (31) formed on the end surface of the shaft body (22) respectively, the shaft body left and right oil holes (32), (33)
Left and right oil passages (34), (35) in the shaft formed inside the shaft (22)
Through the base upper and lower oil grooves (24) and (25) through the left and right oil passages (36) and (37) of the swivel body, respectively.
1) Hydraulic joint of excavator that communicates with.