JPH0712446Y2 - Backhoe hydraulic piping clamp structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial application] The present invention relates to a backhoe hydraulic pipe clamp structure in which a boom is supported on a swivel base via a swing bracket so as to be swingable about a vertical axis.

[Conventional technology]

The piping structure for supplying / discharging pressure oil to / from the boom, arm, and bucket cylinders of the backhoe is a
As shown in JP 61-80852 and JP 63-76050 A, the joint on the upper part of the swivel base, which is laterally displaced from the swing bracket, curves upward to the terminal on the upper part of the boom base. The hydraulic hose for the arm and the bucket is bridged over, and the hydraulic hose for the boom is constructed by connecting the boom cylinder directly to the terminal of the swivel by curving in an upward convex shape.

[Problems to be solved by the device]

According to the conventional technique, the joint on the swivel base is laterally displaced from the swing bracket, so that the curved portion of each hydraulic hose has a boom-like structure as compared with the case where the joint is provided on the swivel base immediately after the swing bracket. Since it is necessary to add an extra length for lateral swing, the length becomes longer and the convex height becomes higher, which makes it difficult to operate because the hose blocks the view in some places during backhoe work. There was a problem.

An object of the present invention is to solve the above-mentioned problem by devising the routing of the boom part in the pressure oil pipe to each cylinder from the swivel base.

[Means for Solving the Problems]

In order to achieve the above-mentioned object, the present invention provides a backhoe hydraulic piping clamp structure in which a pressure oil relay portion provided near a connecting portion between a boom cylinder and the swing bracket of the boom is provided above and below the boom. A hydraulic hose bent in a curved shape along the oscillating direction is used for communication connection, and the relay section and the pressure oil terminal arranged on the upper surface of the boom are also connected for communication with a fixed pipe to communicate with the pressure oil terminal. Hydraulic hose for the connected boom cylinder,
All hydraulic hoses such as hydraulic hoses for bucket cylinders and arm cylinders are horizontally arranged side by side on the upper surface of the boom, and the parallel hydraulic hoses are routed to the swivel side through the inner space of the swing bracket, and ,
Inside the swing bracket, the hydraulic hose group is positioned and fixed to the bracket by a clamp mechanism, and the hydraulic hose that is routed to the swivel base is moved to the bucket cylinder hydraulic hose and arm cylinder hydraulic hose near the bracket. A first pipe bundle composed of a hose and a second pipe bundle composed of a boom cylinder hydraulic hose are branched, and these pipe bundles are laterally separated from each other and fixed in position to the swivel base by a clamp mechanism. This is a characteristic configuration.

[Action]

According to the above construction, the hydraulic hose for the boom cylinder is set together with other hydraulic hoses for the arm cylinder, the bucket cylinder, etc., while the length of the curved hose portion extending between the boom cylinder and the boom is set to be short. They can be arranged side by side on the upper surface of the boom, so that all hydraulic hoses can be routed to the swivel base through the internal space of the swing bracket in an integrated state where all the hydraulic hoses are arranged in parallel.

Since the hydraulic hose group is positioned and fixed inside the swing bracket, it is possible to prevent the hydraulic hose group from sliding in contact with the swing bracket due to the swing of the boom.

In addition, since the first bundle of pipes and the second bundle of pipes are laterally separated and positioned and fixed on the swivel side, even if there is a difference in bending ratio between the two bundles of pipes with respect to the lateral swing of the boom, they are mutually fixed. It can be bent and displaced without interfering with each other.

[Effect of device]

Therefore, both the margin lengths of the hydraulic hose group in the vicinity of the swing bracket with respect to the vertical and horizontal swings of the boom can be shortened, and as a result, the margin length as a whole becomes shorter than that of the conventional swing swing. The height of the convex hoop of the hydraulic hose above the bracket could be greatly reduced, and it was possible to prevent the hindrance of the operator's view during the work as much as possible.

Since the length of the curved hose portion of the boom cylinder can be set to be short, the curved hose portion does not prevent the operator's view.

Also, conventionally, there was room for improvement in appearance because each hydraulic hose was routed in a long curved shape in a convex upward shape near the swing bracket and was installed diagonally. According to the invention, the hydraulic hoses are arranged side by side in a parallel manner, and with an upward convex curve that decreases slightly rearward from the boom, it is orderly and reasonably free, and its exposed portion outside the machine is small. Therefore, it also has the advantage of improving the appearance.

Further, since the boom cylinder is usually stronger than the arm cylinder and the bucket cylinder, its hydraulic hose is also thicker than the others, which causes the boom roll of the first pipe bundle and the second pipe bundle on the swivel side. Although the bending rate of the bending displacement due to the movement is different, since these pipe bundles are positioned and fixed relative to each other, they do not interfere with each other, and therefore the possibility of hose damage due to interference can be eliminated.

〔Example〕

 An embodiment of the present invention will be described below with reference to the drawings.

As shown in FIG. 7, a swivel base (2) is attached to a traveling machine base provided with a crawler traveling device (1) so as to be freely rotatable with respect to the traveling machine base, and a boom support is provided on the swivel base (2). Swing bracket (3) for hydraulic cylinder (4)
Attach the boom (5) to the bracket (3) on the hydraulic cylinder (6) so that it can be rotated about the vertical axis (X ₁ ).
Attached to the boom (5) so that it can be moved up and down by
The arm (7) is attached by a hydraulic cylinder (8) so as to be vertically swingable, and the bucket (9) is attached to the arm (7) by a hydraulic cylinder (10) so as to be vertically swingable.
Also, a backhoe work vehicle is configured by attaching a service port (11) for taking out hydraulic power of a hydraulic working device such as a hand breaker (not shown) to the tip of the boom (5).

As shown in FIG. 8, a bonnet (12) containing an engine (E) is provided at the rear of the swivel base (2), and the bonnet (12) opens and closes on its upper surface at the horizontal axis (X ₂ ). A possible bonnet cover (13) is provided. Then, the upper part after the hood (12) is provided vertically swingably by the cover viewed protect (13) a U-shaped protector (14) is horizontal axis (X _3). Therefore, in order to open the cover (13), the protector (14) may first be swung upward, and then the cover (13) may be opened.

The boom cylinder (6), arm cylinder (8), bucket cylinder (10), and service port (11) of the backhoe device (B) are hydraulically piped from the swivel base (2) side. As shown in FIGS. 1, 2, and 5, the boom oil cylinder (6), the swing bracket (3) of the boom (5), and the pressure oil medium portion (15) provided in the vicinity of the connecting portion. Are connected to each other by a hydraulic hose (16) bent in a curved state along the vertical swing direction surface of the boom (5), and a relay terminal (15) and a pressure oil terminal (on the upper surface of the boom (5) ( 17) and fixed piping (18)
It is connected by communication. Also, a hydraulic hose (19) for the boom cylinder (6) connected to the terminal (17) in communication therewith.
And the hydraulic hoses (20) and (21) for the bucket cylinder (10) and the arm cylinder (8), and the hydraulic hoses for the service port (11) arranged beside the pressure oil terminal (17) ( 22) are arranged side by side horizontally on the upper surface of the boom (5), and these parallel hydraulic hose groups (H) are routed to the swivel base (2) side through the internal space (23) of the swing bracket (3). Inside the swing bracket (3), the hydraulic hose group (H) is positioned and fixed to the bracket (3) by the clamp mechanism (C ₁ ), and the hydraulic hose group (H) arranged on the swivel base (2) side. To
Near the bracket (3), a first pipe bundle (24) including a bucket cylinder hydraulic hose (20) and an arm cylinder hydraulic hose (21), a boom cylinder hydraulic hose (19), and a service port. The swivel base (2) is branched into a second pipe bundle (25) composed of a hydraulic hose (22) for use, and these pipe bundles (24) and (25) are laterally separated from each other.
It is positioned and fixed by the hemming mechanism (C ₂ ) and (C ₃ ).

As shown in FIG. 1, the swing bracket (3) has two pivotal connection parts (26) above and below the swivel base (2).
They are connected by (27), and these connecting parts (26), (27)
Are pivotally supported by the shaft center (X ₁ ) by separate shaft bodies (not shown) so that a space (23a) is provided therebetween. A communication part (23b) having a horizontally long rectangular shape in plan view is formed between the upper connection part (26) and the support part (3a) of the boom (5) and communicates with the space (23a). Yes, these spaces (23a)
The internal space (23) of the swing bracket is constituted by the communication part (23b).

The hydraulic hose group (H) from the terminal (17) is held in parallel by the guard mechanism (G) at the upper surface of the boom (5) near the boom support (3a).

As shown in FIG. 6, in the guard mechanism (G), the hydraulic hose group (H) is arranged in parallel between the upper and lower plates (28) and (29) with the rubber cushions (30) and (30) interposed therebetween. While tightening and fixing the upper and lower plates (28) and (29) with bolts and nuts, attach the roller (3
It is constructed by fixing a U-shaped guard member (32) in front view to which 3) is fitted. Therefore, when the hydraulic hose group (H) is likely to come into contact with the upper surface of the boom (5) due to the vertical swing of the boom (5), the roller (33) of the guard mechanism (G) comes into contact with the boom (5). Since the roller (33) is rotatable, the contact resistance is also reduced.

In addition, in front of the guard mechanism (G), the boom support (3a)
A round bar-shaped protection bar (34) is horizontally installed on the upper end of the communication part (23b) of the nearby bracket (3), and when the boom (5) is lowered, the hydraulic hose group (H) is moved to the boom (5). Prevents contact with the root radius part (5a) of.

As shown in FIG. 3, the inner space (2
In 3), the hydraulic hose group (H) is positioned and fixed to the communication portion (23b) by the clamp mechanism (C ₁ ). This clamp mechanism (C ₁ ) is equipped with rubber cushions (31), (31).
The hydraulic hose group (H) clamped by the communication part (23b)
The hydraulic hose group (H) is arranged in this order from the right side in the traveling direction of the machine, for the service port (11), boom cylinder (6), arm cylinder (8), and bucket cylinder. Although each hydraulic hose (22), (19), (21), (20) for (10) is arranged, since the hydraulic hose (20), (21) for bucket and arm has a small hose diameter. It is stacked in two steps.

As shown in FIG. 2, the first bundle of pipes (24) and the second bundle of pipes (25) are arranged so as to curve toward the left rear in plan view, and the clamp mechanisms (C ₂ ), ( C ₃ ) is positioned on the swivel base (2) and the second pipe bundle (2
The radius of curvature of 5) is larger than that of the first pipe bundle (24). This is to correct the difference in hose displacement due to the left and right swing of the boom (5) due to the different hose diameters of the pipe bundles (24) and (25).

Further, both of the pipe bundles (24) and (25) are curved to the left because the swing angle of the boom (5) to the left is larger than that to the right.

As shown in FIG. 4, the clamp mechanism (C ₃ ) for the second bundle of pipes (25) has the service port hydraulic hoses (22) on both sides of the tongue piece (39) standing upright from the swivel base (2). ) And a boom cylinder hydraulic hose (19), two hoses for supply and discharge are vertically arranged side by side, and a rubber cushion (35) and a holding plate (36) are tightened with bolts.

And the clamp mechanism (C ₂ ) for the first pipe bundle (24) is
A hydraulic hose for arm cylinder (21) and a hydraulic hose for bucket cylinder (20) are stacked vertically, with two hoses for supply and discharge arranged side by side, rubber cushion (37), presser plate (38), and one bolt. Therefore, it is configured to be attached to the swivel base (2) in the state of being fastened together.

It should be noted that reference numerals are added to the claims of the utility model for convenience of comparison with the drawings, but the present invention is not limited to the structure of the accompanying drawings by the entry.

[Brief description of drawings]

The drawings show an embodiment of a hydraulic piping clamp structure for a backhoe according to the present invention, and FIG. 1 is a side view of a main part with a partial cross section, and FIG.
FIG. 3 is a plan view of a main part, FIG. 3 is a plan view of a swing bracket clamp mechanism, FIG. 4 is a partial cross-sectional rear view showing a swing base side clamp mechanism, and FIG. 5 is a perspective view of the main part. 6 is a partial cross-sectional rear view showing the guard mechanism, FIG. 7 is a side view of the backhoe, and FIG. 8 is a perspective view of the bonnet rear portion. (2) …… Swivel base, (3) …… Bracket, (5) ……
Boom, (6) …… hydraulic cylinder, (15) …… relay section,
(16), (19), (20), (21) ... hydraulic hose, (1
7) …… Terminal, (18) …… Fixed tube, (23) ……
Internal space, (24), (25) …… Pipe bundle, (H) …… Hydraulic hose group, (C ₁ ), (C ₂ ), (C ₃ ) …… Clamp mechanism.

Claims (1)

[Scope of utility model registration request] 1. A backhoe hydraulic pipe clamp structure in which a boom (5) is swingably supported on a swivel base (2) around a vertical axis via a swing bracket (3). 6) and the pressure oil relay portion (15) provided in the vicinity of the connecting portion between the boom (5) and the swing bracket (3) are bent in a curved shape along the vertical swing direction surface of the boom (5). The hydraulic hose (16) is connected for communication, and the relay section (15) and the pressure oil terminal (17) arranged on the upper surface of the boom (5) are connected for communication by a fixed pipe body (18). Boom cylinder hydraulic hoses (19) connected in communication with the oil terminal (17), bucket cylinder and arm cylinder hydraulic hoses (20),
All hydraulic hoses such as (21) are arranged side by side on the upper surface of the boom (5) side by side, and the parallel hydraulic hose group (H) is passed through the internal space (23) of the swing bracket (3) to the swivel base (2). And the hydraulic hose group (H) is positioned and fixed to the bracket (3) inside the swing bracket (3) by a clamp mechanism (C ₁ ) inside the swing bracket (3). The hydraulic hose (H) routed to the first pipe bundle (24) including a bucket cylinder hydraulic hose (20) and an arm cylinder hydraulic hose (21) near the bracket (3). , A second pipe bundle (25) composed of a boom cylinder hydraulic hose (19), and these pipe bundles (24), (25) are laterally relatively separated to the swivel base (2). clamping mechanism (C _2), positioned at (C ₃₎ Hydraulic pipe clamp structure of the constant to Aru backhoe.