KR20160001233U - Roller reducing the friction and supporting the load at skid steer loader with extended boom - Google Patents

Abstract

The skid loader of the present invention is a skid loader having a normal boom, which is composed of a main arm having one side connected to a main arm and a front arm having a bucket installed on the other side, A two-stage cylinder fixed to the front arm at one end thereof and lifted or lowered by the hydraulic pressure; a second arm provided inside the main arm and having one end fixed to the front arm; And a control valve for controlling the hydraulic pressure to be introduced into or discharged from the two-stage cylinder, wherein the front arm is supported by a front arm which is raised and lowered by hydraulic pressure, And a support roller for supporting the roller and minimizing the frictional force.

Description

[0001] 1. Field of the Invention [0002] The present invention relates to a skid loader having an extendable boom,

The present invention relates to a boom structure for raising a bucket of a skid loader to a higher level, and more particularly, to a skid loader having a boom structure in two stages. Typically, a skid loader is mounted on a bucket at the end of a boom installed on both the left and right sides of the vehicle body (when viewed from the front), operates with hydraulic pressure, and is a heavy equipment for moving or elevating objects. Since it is small and can rotate in place, it is useful in a narrow space.

1 is a side view of a conventional boom-extension skid loader. As shown in FIG. 1, the conventional skid loader is limited in the length of the boom when loading the vehicle or when loading objects on a high place, and there are some inconveniences or the operation itself is impossible. Accordingly, the skid loader having a boom with an extended boom has been developed and used. However, according to the principle of the conventional boom mounting technique, there is no problem in performing the work, but when the boom is expanded, There was room for development to overcome the looseness caused by the play.

The present invention aims to improve the past technology one step at a time by using a roller bearing or a frictionless bearing using a needle bearing in a sliding portion to eliminate the prolonged life and looseness and to perform a safe operation.

The injection of lubricant between the extended boom (front arm) and the fixed (main arm) arm was the basic method of minimizing the sliding friction, and wear due to friction remained a challenge.

As described above, the present invention has been devised in the past, but it has not been advanced yet, and it has been used improperly in view of the problem of the friction region. It also enables the production of boom-extension skid loaders that have been durable to the product.

1 is a side view showing a conventional skid loader
Figure 2 is a side view of a skid loader with an extendible boom according to the present invention;
3 is a side view showing an operating state according to a preferred embodiment of a skid loader having an extendible boom according to the present invention
Fig. 4 is a hydraulic system diagram showing a hydraulic system operating an extendible boom according to the present invention; Fig.
DESCRIPTION OF THE REFERENCE NUMERALS
10; Boom 11: Main cylinder
13: Casing 14: Front arm
15: bucket cylinder 17: front arm supporting rollers (A to D)
20: Bucket

The construction of the present invention is a conventional boom comprising a main arm 12 provided on one side of a car and a front arm 14 connected to the main arm 12 on one side and a bucket 20 on the other side. The front arm 14 is installed in the outside of the main arm 12 in conformity with the specifications of the front arm 14 interlocked with the upper and lower rollers of 4EA on the upper and lower sides of the main arm 14, A support roller 17A-D provided on a two-stage bar 30 extending or contracted in cooperation with a two-stage cylinder for raising or lowering the front arm 14 to support the movement of the front arm 14, And a control valve 40 for controlling the hydraulic pressure to be discharged.

  Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

  FIG. 2 is a side view showing a skid loader having an extendible boom according to the present invention, and FIG. 3 is a side view showing an operation state according to a preferred embodiment of a skid loader having an extendible boom according to the present invention. The skid loader of the present invention has a structure of a normal skid loader except for the boom 10, and has the following features in the structure of the boom 10. A bracket 16b is provided at a predetermined position above the main arm 12 and a bracket 16a is provided at a distal end of the front arm 14. [ A lower end and an upper end of the second-stage cylinder 31 are installed by the respective brackets 16a and 16b. In addition, the main arm 12 is provided with a two-stage bar 30, and the two-stage bar 30 is fixed to the distal end of the front arm 14 under the bracket 16a, A casing 13 may be provided to protect the connection site. The structure of the boom 10 as described above is applied to the two booms 10 on the left and right sides of the vehicle body 1 in the same manner. The hydraulic pressure for operating the two-stage cylinder 31 is controlled by the operation of the control valve 40 connected to the oil tank 42 of the vehicle body 1 and the hydraulic pump 43.

  Hereinafter, the operation of the present invention having the above-described configuration will be described in detail.

  Like the conventional skid loader, the skid loader of the present invention also operates by moving the cylinder to the hydraulic pressure supplied from the hydraulic pump. The main arm 12 to which the main cylinder 11 is attached is moved in accordance with the reciprocating motion of the main cylinder 11 and the bucket 20 is moved in accordance with the reciprocating motion of the bucket cylinder 15 attached to the front arm 14. [ Is rotated.

  The two-stage cylinder 31 for operating the two-stage boom 10 of the present invention controls the hydraulic pressure generated by the hydraulic pump 43 of the vehicle body 1 via the two-stage bar 30 ). 4 is a hydraulic system diagram showing a hydraulic system operating an extendible boom 10 according to the present invention. When the driver manipulates the foot plate 44 to open A in the control valve 40 and close the distributor 41 to the upper side of the left and right cylinders 31 and 31 (i.e., the two-stage cylinder when viewed from the front) The boom 10 is expanded as shown in FIG. 3, and conversely, when B is opened and A is closed, the oil is introduced into the left and right cylinders 31 and 31 The hydraulic pressure is increased and the cylinder is contracted as shown in Fig. It is preferable that the two-stage cylinder 31 is a double acting type cylinder so as to smoothly perform the above-described operation and to minimize the difference in hydraulic pressure between the rising and falling of the boom 10. It should be noted that the embodiments of the present invention disclosed in this specification and drawings are merely illustrative of specific examples for the purpose of understanding and are not intended to limit the scope of the present invention.

  The range of the roller is not only a general circular bearing but also all mechanical means that can convert the frictional force of extreme pressure into rotational force.

10; Boom 11: Main cylinder
13: Casing 14: Front arm
15: bucket cylinder 17: front arm supporting rollers (A to D)
20: Bucket

Claims (1)

And a control valve (40) for controlling the hydraulic pressure to be introduced into or discharged from the two-stage cylinder (31). The skid loader
A skid loader having a conventional boom comprising a main arm (12) having one side mounted to the vehicle body and a front arm (14) having one side connected to the main arm (12) and the other side equipped with a bucket
A two-stage cylinder 31 which is installed inside or outside the main arm 12 and has one end fixed to the front arm 14 and lifting or lowering the front arm 14 by hydraulic pressure;
A two-stage bar (12) provided inside the main arm (12) and having one end fixed to the front arm (14) and extending or contracting with the two-stage cylinder (31) to support the movement of the front arm (30) and circular rollers (17A-D) for supporting the two-

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