JP2546558Y2 - Boom swing device - Google Patents

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention mainly relates to a boom swing device mounted on a small shovel.

2. Description of the Related Art FIG. 7 is a perspective view of a small shovel. In the drawing, 1 is a lower traveling structure, 2 is an upper revolving structure, 3 is a swing bracket attached to a front portion of the upper revolving structure 2, 4 is a swing cylinder, 5 is a work attachment, 6 is a boom of a work attachment 5, 7 Is a boom cylinder. FIG. 8 is a main part plan view showing the periphery of the swing bracket 3 of the prior art. In the figure, reference numeral 8 denotes a swing bracket mounting portion of the upper swing body 2, 9 denotes a swing center axis, and 10 denotes a swing cylinder mounting bracket. FIG.
It is a side view of the swing bracket 3 seen from A of the figure.
In the drawing, reference numeral 11 denotes a boom mounting bracket of the swing bracket 3, and reference numeral 12 denotes a boom cylinder mounting bracket.

In the small excavator, as shown in FIGS. 8 and 9, a boom 6 is mounted on a front portion of the upper swing body 2 via a swing bracket 3. And swing cylinder 4
The work attachment 5 is swung right and left by the operation of.

In addition, the swing cylinder 4 of the prior art is
It was equipped in the front and rear direction inside.

Problems to be Solved by the Invention In the conventional small shovel, when the swing cylinder is operated, as shown in FIG. 8, the center OO 'of the upper revolving unit 2 is moved leftward by α ° (for example, about 90 °) and rightward To β ° (β
(<90 °), the boom 6 swings.

Since small shovels carry out various types of construction work, it was necessary to swing the work attachment about 90 ° in both the left and right directions. However, since the swing cylinder is provided on the side of the mounting portion (reference numeral 8 in FIG. 8) of the upper revolving unit, the boom cannot be swung left and right by about 90 °. In addition, since the swing cylinder is provided in the upper revolving structure in the front-rear direction, it is difficult to arrange the engine and various hydraulic devices in terms of space.

Means for Solving the Problems In a small excavator in which a boom is mounted on a front portion of an upper revolving structure via a swing bracket, and the boom is swung right and left by operating a swing cylinder, a small excavator is provided in front of the upper revolving structure. The swing cylinder is disposed at a position which can be substantially accommodated in the upper revolving body, a pair of upper and lower pin insertion bosses are provided on the outer peripheral portion of the cylinder tube of the swing cylinder, and a plurality of pin holes are opened in the swing bracket. A swing cylinder mounting bracket is provided so that the swing cylinder can be selectively mounted in the pin hole via the pin insertion boss. Furthermore,
When the pin holes of the pair of upper and lower bosses provided on the outer peripheral portion of the cylinder tube of the swing cylinder are coupled with the pin holes of the swing cylinder mounting bracket of the swing bracket, the upper pin and the lower pin pass through both the pin holes. Are inserted from above and below, respectively, and a U-shaped elastic bracket is detachably attached between the upper end surface of the upper pin and the lower end surface of the lower pin to prevent the upper pin and the lower pin from falling off. Configured.

Action (1) a. Each of the positions of the plurality of pin holes formed in the swing cylinder mounting bracket has a displacement angle relative to the swing center axis.

B. By selectively attaching and changing the swing cylinder to the plurality of pin holes in the above item a), the swing bracket turns differently when the swing cylinder is operated. Therefore, the swing angle of the boom can be changed.

C. Since the swing cylinder is attached to the front of the upper revolving unit in the left-right direction, the degree of freedom in layout of the engine, various hydraulic devices, and the like is increased, and maintenance of the swing cylinder can be easily performed.

(2) a. An elastic bracket having a U-shape in side view is attached to the upper pin and the lower pin that lock the swing cylinder in order to prevent the pins from dropping off. Since the U-shaped elastic metal fitting has elasticity, the opening can be easily opened and closed by opening the mouth width portion. As a result, the upper and lower pins can be easily attached and detached, so that the swing cylinder can be easily replaced.

Embodiment An embodiment of the present invention will be described below in detail with reference to the drawings. FIG. 1 shows a swing device according to an embodiment of the present invention.
FIG. 13 is a plan view of a principal part showing 13; In the figure, the same reference numerals are given to components using the same components as the conventional technology. 14
Is a swing bracket of the swing device 13, 15 is a swing cylinder mounting bracket fixed to the swing bracket 14, 16 is a swing cylinder provided at the front of the upper swing body 2 ', and 17 is a swing cylinder rod attachment of the upper swing body 2'. Bracket. FIG. 2 is a detailed view of a portion A in FIG. In the drawing, 18, 19, and 20 are pin holes for mounting a swing cylinder (16) of a swing cylinder mounting bracket 15 (hereinafter referred to as a bracket 15), 21 is an upper pin for mounting the swing cylinder 16 on the bracket 15, and 22 is a lower pin. The side pin 23 is a U-shaped elastic bracket. FIG. 3 is a partially cutaway side view showing a mounting portion of the swing cylinder 16 to the swing bracket 14 as viewed from the line BB in FIG.
In the figure, 11 'is a boom mounting bracket for the swing bracket 14, 12' is a boom cylinder mounting bracket, 24 is an upper pin insertion boss (hereinafter referred to as an upper boss 24) fixed to the swing cylinder 16, and 25 is an upper boss. Boss 24 pin holes,
Reference numeral 26 denotes a lower pin insertion boss fixed to the swing cylinder 16 (hereinafter referred to as lower boss 26), and reference numeral 27 denotes a pin hole of the lower pin insertion boss 26. FIG. 4 is an exploded configuration perspective view of a mounting portion of the swing cylinder 16 in FIG. FIG. 5 is a perspective view showing a U-shaped elastic bracket 23 'of another embodiment. The difference between the U-shaped elastic bracket 23 'and 23 is that the shape of the tip of the mouth portion is different, but the function is the same. FIG. 6 is a plan view of the embodiment showing the swing device 13 when the swing cylinder 16 is replaced with the pin hole (20) in the bracket 15.

Next, the configuration of the swing device 13 according to the present invention will be described in the first.
Referring to FIG. 6 to FIG. A swing cylinder 16 is attached to the front of the upper revolving unit 2 'in the left-right direction, and a pair of upper and lower pin bosses 24 and a lower boss 26 are provided on the outer peripheral portion of the cylinder tube of the swing cylinder 16. On the other hand, the swing cylinder 16 is selectively attached to the bracket 15 of the swing bracket 14.
A plurality of pin holes 18, 19, and 20 where holes can be attached were formed. When the swing angle of the boom 6 is changed, the swing cylinder 16 is selectively connected to the pin holes 18, 19, 20 of the bracket 15. The pin holes 25 and 27 of the upper and lower bosses 24 and 26 provided on the swing cylinder 16 and the pin holes of the bracket 15 (one of the pin holes 18, 19 and 20) At the time of connection, the upper pin 21 and the lower pin 22 are inserted through the two pin holes from above and below, respectively, and the upper pin 21 and the lower pin 22 are inserted in order to prevent the upper pin 21 and the lower pin 22 from falling off. A U-shaped elastic bracket 23 is detachably attached between the upper end surface of the lower pin 22 and the lower end surface of the lower pin 22.

Next, the function of the swing device 13 according to the present invention will be described. As shown in FIG.
When the swing cylinder 16 is connected to
When the swing cylinder 16 is operated, the boom 6 can be swung leftward by α ° (about 90 °) and rightward by β ° (β ° <90 °). Here, the positions of the plurality of pin holes 18, 19, and 20 formed in the bracket 15 are different from each other by the displacement angle γ with respect to the swing center axis 9 as shown in FIG.
° ₁ and γ ° ₂ . Therefore, by selectively replacing the swing cylinder 16 with the plurality of pin holes 18, 19, and 20, the rotation angle direction of the swing bracket 14 when the swing cylinder is operated becomes different. Therefore, the swing angle of the boom 6 can be changed. For example, as shown in FIG.
The boom 6 can be swung by β ° (β ° <90 °) to the left and α ° (eg, about 90 °) to the right from the center O-O ′ of FIG. When the swing cylinder 16 is connected to the pin hole 19 of the bracket 15 (not shown), the boom 6 can be swung in the left and right directions by the same angle when the swing cylinder 16 is operated.
In addition, since the swing cylinder 16 is attached to the front part of the upper swing body 2 'in the left-right direction, the degree of freedom of layout of the engine, various hydraulic devices (not shown), etc. is increased, and the maintenance of the swing cylinder 16 is facilitated. Can be.

In addition, in the swing device 13 according to the present invention, a U-shaped elastic metal fitting 23 is attached to the upper pin 21 and the lower pin 22 that lock the swing cylinder 16 in order to prevent the upper pin 21 and the lower pin 22 from dropping. I have. Since the U-shaped elastic metal member 23 has elasticity, its mouth portion ea '(see FIG. 4) is opened and can be easily attached and detached. As a result, the upper pin 21 and the lower pin 22 can be easily attached and detached.
16 can be easily replaced.

Effect of the Invention In the swing device according to the invention, in a small excavator in which a boom is mounted on a front portion of an upper revolving structure via a swing bracket and the boom is swung right and left by operating a swing cylinder, The swing cylinder is disposed at a position substantially within the upper revolving body at the front part of the revolving body, and a pair of upper and lower pin insertion bosses is provided on an outer peripheral portion of a cylinder tube of the swing cylinder,
A swing cylinder mounting bracket having a plurality of pin holes formed in the swing bracket is provided, and the swing cylinder can be selectively mounted to the pin holes by pins via the pin insertion bosses. Furthermore, the pin comprises an upper pin and a lower pin, and connects a pair of upper and lower pin insertion bosses provided on an outer peripheral portion of a cylinder tube of the swing cylinder to pin holes of a swing cylinder mounting bracket of the swing bracket. and when,
The upper pin hole and the upper pin insertion boss are connected by inserting the upper pin from above, and the lower pin hole and the lower pin insertion boss are connected to the lower side. A pin is inserted from below and connected, and a U-shaped elastic bracket is detachably attached between the upper end surface of the upper pin and the lower end surface of the lower pin to prevent the upper pin and the lower pin from falling off. , The swing angle of the boom can be changed by replacing the swing cylinder with a plurality of pin holes of the swing cylinder mounting bracket. In addition, since the swing cylinder is attached to the front part of the upper revolving structure in the left-right direction, the degree of freedom of layout of various hydraulic devices of the engine is increased, and the maintenance of the swing cylinder can be easily performed. Also, since the U-shaped elastic metal fittings are attached to the upper pin and the lower pin that lock the swing cylinder, the swing cylinder can be easily replaced.

Therefore, in the small shovel equipped with the swing device according to the present invention, the swing cylinder can be easily replaced and the work attachment can be swung right and left by about 90 ° at a time, thereby expanding the work range and improving work responsiveness. Improve. In addition, the layout of various devices inside the upper swing body and the maintenance of the swing cylinder are improved.

[Brief description of the drawings]

FIG. 1 is a plan view of a main part showing a swing device according to an embodiment of the present invention, FIG. 2 is a detailed view of a portion A in FIG. 1, and FIG. FIG. 4 is an exploded perspective view of a mounting portion of the swing cylinder in FIG. 3, FIG. 5 is a perspective view showing a U-shaped elastic bracket according to another embodiment, and FIG. 6 is FIG. FIG. 7 is a plan view showing a state in which a swing cylinder is attached to another pin hole in the swing device according to the first embodiment, FIG. 7 is a perspective view of a small shovel, FIG. FIG. 9 is a side view of a conventional swing bracket. 2,2 '... Revolving superstructure 3,14 ... Swing bracket 4,16 ... Swing cylinder 5 ... Work attachment 6 ... Boom 9 ... Swing center axis 10,15' ... Swing cylinder mounting bracket 13 … Swing device 18,19,20… Pin holes 24,26… Pin insertion boss 21… Upper pin 22… Lower pin 23,23 ′… U-shaped elastic bracket

Claims (2)

(57) [Scope of request for utility model registration] 1. A small excavator in which a boom is mounted on a front portion of an upper revolving structure via a swing bracket, and the boom is swung right and left by operating a swing cylinder. A swing cylinder in which the swing cylinder is disposed at a position to be accommodated in the upper swing body, a pair of upper and lower pin insertion bosses are provided on an outer peripheral portion of a cylinder tube of the swing cylinder, and a plurality of pin holes are formed in the swing bracket. A boom swing device, comprising a mounting bracket, wherein the swing cylinder can be selectively mounted to the pin hole by a pin via the pin insertion boss. 2. A boom swing apparatus according to claim 1, wherein said pin comprises an upper pin and a lower pin, and a pair of upper and lower pins provided on an outer peripheral portion of a cylinder tube of said swing cylinder. When connecting the boss and the pin hole of the swing cylinder mounting bracket of the swing bracket, the upper pin hole and the upper pin insertion boss are connected by inserting the upper pin from above. Connecting the lower pin hole and the lower pin insertion boss by inserting the lower pin from below and connecting the upper pin and the lower pin to prevent the upper pin and the lower pin from falling off. A boom swing device characterized in that a U-shaped elastic bracket is detachably attached between an upper end surface of a pin and a lower end surface of a lower pin.