JP2502195Y2 - Backhoe electrical wiring structure - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION [Industrial field of application] The present invention relates to a backhoe electric wiring structure in which a sensor for detecting a relative angle of a bucket with respect to an arm is provided at a pivotal connection portion between the bucket and the arm. Regarding

[Conventional technology]

This kind of electric wiring structure has conventionally arranged the wiring of the bucket angle detection potentiometer toward the boom while clamping the wiring along the arm, and for the waterproofing of the potentiometer, a housing incorporating the potentiometer, Also, the wire take-out portion from the wire is also waterproof.

[Problems to be solved by the device]

However, in the backhoe, the arm is in contact with the wall surface of the excavation hole formed in the ground during excavation work, the plunging sand surface of the bucket in the scooping operation of the embankment, etc.
Alternatively, since it is quite possible that the scooping earth and sand on the bucket contacts the arm, the wiring along the arm may be rubbed and damaged by earth and sand or rock fragments, and in some cases, the wire may be broken.

The present invention has an object to provide an electric wiring structure for a backhoe that does not have the above-mentioned problems.

[Means for Solving the Problems]

For this purpose, the present invention is the backhoe electric wiring structure described at the beginning, in which one end of a pipe is connected and fixed to a hermetically-sealed housing that houses the sensor, and the pipe extends toward the root of the arm. Installed, the extended end portion is bent in a U shape toward the bucket side, the wiring of the sensor is routed through the pipe toward the traveling platform, and the end of the pipe on the housing side. A packing for press-fitting and supporting the wiring in close contact therewith is fitted in the portion.

[Action]

By passing the wiring of the sensor through the pipe extending from the housing, for the bucket side part of the arm that has a relatively large chance of contact with earth and sand or rock fragments, the wiring will not be broken by the pipe. Can be protected.

Since the packing is provided at the end of the pipe on the housing side, it can be waterproofed so that it will not enter the housing even if water enters the pipe, and the extended end of the pipe is U-shaped toward the bucket side. Since it is bent to the inside, it is difficult for water to enter the piping due to its structure. Even if water enters, if the U-shaped bending direction is directed toward the machine body as shown in FIG. 3, the arm swings up and then swings down. It can be discharged. In other words, if normal work such as excavation is performed, the water in the pipe will naturally escape.

In addition, it is possible to install the packing by pressing it into the extended end of the pipe, but this will seal the inside of the pipe and the air inside will expand and contract as the outside air temperature changes. Since the packing may come off or be damaged due to this, the structure having one side open rather exhibits a reliable and effective waterproofing action as described above.

[Effect of device]

Therefore, a relatively simple and economically disadvantageous modification of passing the wiring through the packing in the pipe provided along the arm was performed along the arm while maintaining good waterproofness for the sensor. It was possible to provide a backhoe electric wiring structure capable of effectively protecting the wiring.

〔Example〕

As shown in FIG. 3, the boom (1), the arm (2),
A swivel base (4) equipped with a backhoe device (A) consisting of a bucket (3) can be swung freely to a machine base (7) equipped with a soil discharge plate (5) and capable of traveling with a crawler traveling device (6). A backhoe is constructed by mounting.

The bucket (3) and the arm (2) have a horizontal axis (X).
A bucket shaft (8) pivotally connected to the arm (2) and an interlocking link (9) pivotally supported by the bucket (3) are connected so as to be rotatable about the connecting shaft (10). Pivotally connected by means of a shaft (10) connected to the bucket cylinder (1
Driven by 1), the bucket (3)
Is configured to be rotatably driven relative to the arm (2).

In this backhoe device, it is equipped with an electric control device that enables automatic control such as repeatedly performing the set excavation work, and risk avoidance control that allows the backhoe device to operate only within the setting range. A sensor (not shown) that detects the relative displacement of each of the relative rotation parts of the backhoe is installed. Next arm (2)
The bucket angle detection device (B) for detecting the relative rotation angle between the bucket and the bucket (3) will be described.

As shown in FIG. 1, the arm (2) and the bucket (3)
A potentiometer (12) as a sensor for detecting a relative rotation angle between the bucket link (8) and the arm (2) is provided at a pivotal connection portion between the bucket link (8) and the arm (2).

The arm (2) and the bucket link (8) are pivotally connected to each other by a pivotally supported pin (13) having a flange and fixed to the bucket link (8) so as to rotate integrally. The inner diameter of the boss (8a) of the bucket link (8) on the side opposite to the flange of the pivot pin (13) is formed in a step-like shape with the outer side protruding, and the housing (H ) As a cylindrical case (14) having a protruding cylindrical portion (14a) fitted therein in a relatively rotatable manner, and the case (14) is attached to a bracket (15) protruding from the arm (2). It is supported in a cantilevered state in which it is prevented from rotating and coming off in the axial direction.

Inside the case (14), a potentiometer (12) is bolted to the stepped portion via a rubber cushion (16), and an operation shaft (17) of the potentiometer (12) is pivotally supported by a pivot pin (13). ), And the operating shaft (17) and the pivot pin (13) rotate integrally with the pivot pin (13). (Oldham joint) (18) and rubber joint (23) are interlockingly connected.

A clearance is provided in the radial direction between the operation shaft (17) and the case (14) so as to allow the play of the pivot pin (13) and the case (14).

The potentiometer (12) has a structure in which the main body (12b) is fixed with two screws to a mounting base (12a) attached to the case (14), and the cover (19) is bolted to the case (14). It has been stopped to enhance the guard function and has a waterproof structure for the potentiometer (12).

Next, the wiring structure of the potentiometer (12) will be described.

As shown in FIG. 1 and FIG. 3, the pipe (20) is fixed to the lower end of the case (14) and is communicated and fixed through the screw joint (21), and the pipe (20) is fixed to the arm (2). Along the side surface of the boom (1), the upper end of the extension is bent downward in a U-shape, and the exit (2
2) has been formed.

The wiring (24) from the potentiometer (12) has a second
As shown in the figure, a packing (25) that tightly penetrates the wiring (24) is attached in advance, the connector (26) at the tip is passed through the pipe (20) and taken out from the outlet (22), and the case (14) is also attached. The packing (25) is press-fitted into the wire take-out cylindrical hole (27) to support the wire (24), and water is prevented from entering from the inside of the pipe (20) into the case (14). There is.

In addition, between the case (14) and cover (19), and the screw joint (2
It is convenient to interpose a waterproof packing between 1) and the case (14).

[Another embodiment]

Direct the outlet (22) of the pipe (20) to the counter base side and connect the pipe (20) directly to the case (1) as shown in FIG.
4), screw the packing (25) with the wire (24) into the lower end of the pipe (20), and after installing the pipe (20), install the wire (24a) on the potentiometer (12) side. ) May be configured to be connected to the wiring (24) in the pipe through a drop-shaped coupler (28).

In the present invention, the cylindrical hole (27) of the case (14) is also connected to the pipe (2
0) is interpreted as a part.

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]

FIG. 1 shows an embodiment of an electric wiring structure of a backhoe according to the present invention. FIG. 1 is a sectional view showing a structure of a bucket angle detecting device, FIG. 2 is a perspective view showing wiring of a potentiometer, and FIG. 3 is a backhoe. An overall side view and FIG. 4 are sectional views showing another embodiment of the wiring structure. (2) …… arm, (3) …… bucket, (12) …… sensor, (20) …… piping, (24) …… wiring, (25) …… packing, (H) …… housing.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Creator Takanori Miura 64 Ishizukitamachi, Sakai City, Osaka Prefecture Kubota Sakai Factory (72) Creator Masanaga Shintani 64, Ishizukitamachi, Sakai City, Osaka Kubota Sakai Co., Ltd. Inside the factory

Claims (1)

(57) [Scope of utility model registration request] 1. A sensor (12) for detecting a relative angle of a bucket (3) with respect to an arm (2), comprising:
An electrical wiring structure of a backhoe provided at a pivotal connection portion between the arm (2) and the arm (2), wherein one end of a pipe (20) is fixedly communicated with a hermetically sealed housing (H) that accommodates the sensor (12). Then, the pipe (20) is extended toward the root of the arm (2), and the extended end portion is bent in the U-shape toward the bucket (3) side, and the sensor (12 )
A packing for routing the wiring (24) toward the traveling platform through the pipe (20) and for supporting the wiring (24) by closely penetrating the end of the pipe (20) on the housing side. Backhoe electric wiring structure with (25) press-fitted.