JP2002081091A - Fitting structure of swing angle detector for hydraulic back hoe - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a swing angle detecting structure for a hydraulic back hoe reducing the number of component items and improving the assemblage of a swing angle detector as an attachment. SOLUTION: This fitting structure is provided with a revolving superstructure, a bracket pivot part having the axis of a boss facing vertically in the front end of the revolving superstructure, a swing bracket having a boss rotatably connected to the boss of the bracket pivot part about the vertical shaft by a pin, and a limit switch detecting the turning angle or the swing bracket. A detection counterpart being in contact with the limit switch is molded on the circumferential face of the boss of the swing bracket.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a mounting structure of a swing angle detecting device for a hydraulic shovel provided with a swing bracket that allows the attachment to turn left and right.

[0002]

2. Description of the Related Art The piping structure of a general hydraulic excavator will be described below in detail with reference to the drawings. FIG. 4 is a side view of a general hydraulic excavator provided with a swing bracket. In the figure, reference numeral 50 denotes a hydraulic excavator. The hydraulic excavator 50 includes a lower traveling body 51 that can travel freely, and an upper revolving body 52 that is rotatably mounted on an upper portion of the lower traveling body 51.
And an attachment 53 mounted on the front part of the upper swing body 52 so as to be rotatable vertically and horizontally. A bracket pivot 58 is provided at the front end of the upper swing body 52. A swing bracket 57 is attached to the front of the bracket pivoting portion 58 so as to be rotatable in the left-right direction.

The attachment 53 includes a boom 54 having one end attached to the vicinity of the upper end of the swing bracket 57, an arm 55 having one end attached to the other end of the boom 54, and an attachment 55 attached to the tip of the arm 55. Bucket 56. The boom 54
Is rotatable up and down by a boom cylinder 54a having both ends connected to the vicinity of the front end of the swing bracket 57 and to the boom 55. The arm 55
Is rotatable by an arm cylinder 55a disposed between the back surface of the boom 54 and the end of the arm 55. Further, the bucket 56 is rotatable by a bucket cylinder 56a disposed between the bucket 56 and the back of the arm 55.

[0004]

The above-described hydraulic excavator has conventionally been a machine for performing excavation work. However, in recent years, its use has been diversified, and a structure in which a hook can be attached to a tip of an arm to perform a suspended load operation ( Hereafter, crane specifications have appeared. In this suspended load operation, it is necessary to perform the operation by setting the swing angle to 0 degree (state in which the direction of the attachment is parallel to the traveling direction of the lower traveling body) in order to surely exhibit the suspending ability. It was difficult for the operator to intuitively perform the positioning.

Therefore, a structure for detecting a swing angle by preparing a limit switch and a cam corresponding to the limit switch is conventionally known. In this case, a limit switch and a dedicated cam are required. It has been desired to reduce the number of parts. In addition, special specifications such as crane specifications are often added after the customer's request. In this case,
It is very troublesome to provide a cam and a limit switch on a member having only a very small space, such as a swing bracket and a bracket attachment portion, and it has been desired to reduce the time for assembling work.

The present invention has been made in view of such circumstances, and provides a swing angle detecting structure of a hydraulic shovel in which the number of parts of an attachment swing angle detecting device is reduced and assemblability is improved. With the goal.

[0007]

According to a first aspect of the present invention, there is provided an upper revolving body, a bracket pivoting portion provided at a front end portion of the upper revolving body with an axis of a boss directed vertically.
A swing bracket having a boss rotatably connected to the boss of the bracket pivot portion about a vertical axis, and a limit switch for detecting a rotation angle of the swing bracket; On the circumferential surface, a detected portion that comes into contact with the limit switch is processed and formed.

[0010] According to this, since the detected portion for the limit switch is directly formed on one boss of the swing bracket, it is not necessary to prepare a separate cam as in the conventional case, and the number of parts can be reduced. In addition, by forming a detected portion (for example, a notch) in advance at the time of manufacturing, it is possible to easily configure a swing angle detecting device by simply attaching a limit switch or the like when retrofitting a swing angle detecting device on site according to a customer's request. This leads to a significant reduction in working time.

According to a second aspect of the present invention, in the mounting structure of the swing angle detecting device of the hydraulic shovel according to the first aspect, the bracket pivoting portion is provided with a pair of bosses which are vertically separated from each other. The swing bracket includes a pair of bosses sandwiching each boss of the bracket pivot portion, and the detected portion includes a bracket pivotally supporting the boss on the upper swing body. And a limit switch is provided inside the box of the bracket pivoting portion.

In this case, since the limit switch can be housed inside the box at the bracket pivoting portion, it is possible to prevent contact with the earth and the like scattered by excavation or the like, thereby improving the service life of the limit switch. Can be achieved. Further, it is possible to prevent the limit switch from getting wet with rainwater or the like.

According to a third aspect of the present invention, in the mounting structure of the swing angle detecting device for a hydraulic shovel according to the second aspect, the limit switch is mounted on a lower surface of an upper plate of a box of the bracket pivot portion. It is characterized by the following.

According to this structure, the limit switch can be arranged near the lower portion of the wide upper plate, so that the limit switch can be more reliably prevented from getting wet with rainwater or the like.

According to a fourth aspect of the present invention, in the mounting structure of the swing angle detecting device for a hydraulic shovel according to the third aspect, the mounting member for mounting the limit switch to the lower surface of the upper plate of the box is at least one of the limit switches. It is characterized in that the lower surface is configured to be covered.

According to this, by covering at least the lower surface of the limit switch with the mounting member, it is possible to prevent contact with the hydraulic pipe passing through the bracket attachment portion and the inside of the swing bracket, and contact with the scattered earth and sand. Therefore, the useful life of the limit switch can be improved.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a detailed side view of a main part showing a mounting structure of an angle detecting device for a swing bracket according to the present invention. FIG. 2 is a detailed view of a main part showing a cross section AA of FIG. FIG. 3 is a diagram showing a mounting structure of the limit switch. The components having the same configuration as the prior art are denoted by the same reference numerals, and description thereof will be omitted.

In the figure, a bracket pivoting portion 58 provided at the front end of the upper revolving structure 52 has a pair of bosses (upper boss, lower boss) 5 whose axes are directed vertically in the front end thereof.
8b, and each of the bosses 58b is
It is supported by the upper plate 58a or the bottom plate 58d.
The upper plate 58a and the bottom plate 58d are connected to a pair of side plates 5a.
8c, and is formed as a box-shaped strength member having a cavity therein.

The swing bracket 57 is provided with two pairs of bosses 5 sandwiching the pair of bosses 58b from above and below, and by connecting the pair of bosses 5 and the bosses 58b with the pins 4, the swing bracket 57 swings. The left and right rotation of the bracket 57 with respect to the bracket pivot 58 is enabled.

A limit switch 1 is provided on the lower surface of the upper plate 58a so as to abut on the circumferential surface of the boss 5b of the swing bracket 57, which is located immediately below the upper plate 58a. Have been. On the other hand, on the circumferential surface of the boss 5b, a notch 5a, which is a detected portion, is provided so that the limit switch 1 is not in contact with the boss 5b when the swing angle of the swing bracket 57 is substantially 0 degree. Is provided. When the limit switch 1 detects that the swing angle is 0 degrees, the electric signal is input to the controller through a harness (not shown) connected to the limit switch 1. Then, the controller performs control such as locking the operation pedal according to this signal.

The structure of mounting the limit switch 1 to the upper plate 58a will be described. A block 3 is provided on the lower surface of the upper plate 58a, and a plate-shaped mounting member 2 having a concave portion 2a is provided in the block 3. They are connected by bolts 6. The limit switch 1 is accommodated in the recess 2a of the mounting member 2. In this case, since the limit switch 1 can be arranged near the lower part of the wide upper plate 58a, it is possible to prevent the limit switch 1 from getting wet with rainwater or the like. Further, by covering the periphery of the limit switch 1 with the mounting member 2 or the like, it is possible to prevent contact with the hydraulic piping 7 passing through the bracket pivoting portion 58 and the inside of the swing bracket 57 and contact with scattered earth and sand. Therefore, the service life of the limit switch 1 can be improved.

Further, since the notch 5a for the limit switch 1 is formed directly on one boss 5b of the swing bracket 57, it is not necessary to prepare a separate cam as in the prior art, and the number of parts can be reduced. In addition, by forming the notch 5a in advance at the time of manufacturing, when the swing angle detecting device is retrofitted on site, it can be easily configured only by attaching the limit switch 1 or the like according to the request of the customer. This leads to a significant reduction.

Here, the swing bracket 57 is used.
A case has been described in which the notch 5a as a detected portion is formed in the boss 5b. However, the present invention is not limited to this. In this case, the limit switch 1 may be arranged so as not to be in normal contact with the boss 5b and to be in contact with only the protrusion.

[0022]

According to the first aspect of the present invention, the portion to be detected with respect to the limit switch is one of the swing brackets.
Since the two bosses are directly processed, it is not necessary to prepare a separate cam as in the conventional case, and the number of parts can be reduced. In addition, a part to be detected (for example, a notch) is
By using the method described above, when a swing angle detection device is retrofitted on site at the customer's request or the like, the swing angle detection device can be easily configured simply by attaching a limit switch or the like, leading to a significant reduction in work time.

According to the second aspect of the present invention, since the limit switch can be housed inside the box at the bracket pivot portion, it is possible to prevent contact with the earth and the like scattered by excavation or the like. The service life of the limit switch can be improved. Further, it is possible to prevent the limit switch from getting wet with rainwater or the like.

According to the third aspect of the present invention, the limit switch can be arranged near the lower portion of the wide upper plate, so that the limit switch can be more reliably prevented from getting wet with rainwater or the like.

According to the fourth aspect of the present invention, at least the lower surface of the limit switch is covered with the mounting member, so that it comes into contact with the bracket pivoting portion and the hydraulic pipe passing through the inside of the swing bracket, and the contact with the scattered earth and sand. Therefore, the useful life of the limit switch can be improved.

[Brief description of the drawings]

FIG. 1 is a detailed side view of a main part showing a mounting structure of an angle detecting device for a swing bracket according to the present invention.

FIG. 2 is a main part detailed view showing a cross section AA of FIG. 1;

FIG. 3 is a diagram showing a mounting structure of a limit switch.

FIG. 4 is a side view of a general hydraulic excavator provided with a swing bracket.

[Explanation of symbols]

 1: Limit switch 2: Mounting member 5: Boss 5a: Notch 52: Upper revolving body 57: Swing bracket 58: Bracket pivot portion 58b: Boss

Claims (4)

[Claims] 1. An upper revolving structure, a bracket pivoting portion provided at the front end of the upper revolving structure with the axis of the boss oriented vertically, and the boss of the bracket pivoting portion pivots about a longitudinal axis. A swing bracket having a boss freely connected to a pin, and a limit switch for detecting a rotation angle of the swing bracket, and a detected object that comes into contact with the limit switch on a circumferential surface of the boss of the swing bracket. A mounting structure for a swing angle detecting device of a hydraulic shovel, wherein a part is formed by processing. 2. The bracket pivoting portion comprises a pair of bosses which are vertically spaced apart from each other, and a box body which supports the boss on an upper revolving structure. The boss of the swing bracket is connected to the bracket pivot. The detected portion is provided on a boss located below and below the upper boss of the bracket pivoting portion, and the limit switch is attached to the bracket pivoting portion. 2. The device according to claim 1, wherein the device is provided inside a box body.
A mounting structure of the swing angle detection device for the hydraulic excavator according to the above description. 3. The mounting structure for a swing angle detecting device for a hydraulic shovel according to claim 2, wherein the limit switch is mounted on a lower surface of an upper plate of the box body of the bracket pivoting portion. 4. A structure in which a mounting member for mounting the limit switch to a lower surface of an upper plate of the box body covers at least a lower surface of the limit switch.
A mounting structure of the swing angle detection device for the hydraulic excavator according to the above description.