Work vehicle including loader work device

Abstract

Provided is a work vehicle including a cabin and a loader work device. The work vehicle includes: a vehicle main body; a main body rear; front and rear wheels; a bucket; a lifting arm connected to the bucket to lift the bucket; a boom support connected to the lifting arm; a rear link having one end coupled to a first boom support hinge part of the boom support and an opposite end coupled to a rear hinge part of the main body rear; a boom cylinder having one end coupled to a second boom support hinge part of the boom support to rotate the boom support; and a rotation link having one end coupled to a third boom support hinge part of the boom support and an opposite end coupled to a front hinge part of the vehicle main body.

Claims

1. A work vehicle including a cabin and a loader work device, the work vehicle comprising: a vehicle main body for supporting the cabin; a main body rear disposed on a rear side of the vehicle main body; front and rear wheels for moving the work vehicle; a bucket for receiving a load; a lifting arm connected to the bucket to lift the bucket up and down; a boom support connected to the lifting arm; a rear link having one end coupled to a first boom support hinge part formed in the boom support and an opposite end coupled to a rear hinge part formed in the main body rear; a boom cylinder having one end coupled to a second boom support hinge part formed in the boom support to rotate the boom support such that the lifting arm rotates or moves up and down; and a rotation link having one end coupled to a third boom support hinge part formed in the boom support and an opposite end coupled to a front hinge part formed at a front end of the vehicle main body, wherein the one end of the boom cylinder is coupled to the second boom support hinge part, and an opposite end of the boom cylinder is directly coupled to the rear hinge part together with the rear link, wherein a rotation center of the rear link is same as a rotation center of the boom cylinder.

2. The work vehicle of claim 1, wherein the front hinge part is formed above the front wheel of the work vehicle, or formed vertically above between the front wheel and the rear wheel.

3. The work vehicle of claim 1, wherein the second boom support hinge part is formed at a position higher than the third boom support hinge part, and the second boom support hinge part is maintained at the position higher than the third boom support hinge part even when the boom support and the lifting arm rotate.

4. The work vehicle of claim 1, wherein the boom support is partially bent or curved.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) FIG. 1 shows a state in which a bucket is being lifted in a conventional loader work machine.

(2) FIGS. 2 to 5 are views showing a configuration and an operation process of a loader work device according to a first embodiment of the present invention.

(3) FIG. 6 is a view showing positions of the buckets during an operation of the loader work device according to the first embodiment.

(4) FIGS. 7 to 9 are views showing the configuration and the operation of the loader work device according to a second embodiment of the present invention.

DETAILED DESCRIPTION OF THE INVENTION

(5) FIGS. 2 to 5 are views showing a configuration and an operation process of a loader work device according to a first embodiment of the present invention, and FIG. 6 is a view showing positions of the buckets during an operation of the loader work device according to the first embodiment.

(6) First, referring to FIGS. 2 to 5, in a loader work device of the embodiment, a vehicle such as a tractor and an industrial vehicle includes a cabin 5 in which a user rides, and a vehicle main body 1 configured to support the cabin 5 and connected with a front wheel 2 and a rear wheel 3.

(7) In addition, a main body rear 7 for receiving components such as an engine is disposed on a rear side of the vehicle main body 1.

(8) The loader work device of the embodiment includes a lifting arm 200 connected to the bucket 4 for loading or receiving a load, and a boom cylinder 20 for providing a force such that the lifting arm 200 moves up and down. In addition, the loader work device is provided with a boom support 100 for connecting the lifting arm 200 to the boom cylinder 20, and the boom support 100 has three hinge parts at mutually different positions.

(9) In detail, the boom support 100 has a first boom support hinge part 110 to which a rear link 70 is rotatably connected, a second boom support hinge part 120 to which the boom cylinder 20 is connected, and a third boom support hinge part 130 connected to a rotation link 300 connected to a front side of the vehicle main body 1.

(10) The first to third boom support hinge parts are disposed at mutually different positions in the boom support 100. In particular, the second boom support hinge part 120 is disposed at a position higher than the third boom support hinge part 130 so that the bucket may be vertically lifted up and down. The boom support 100 is curved in a ‘reverse-L’ shape, or is partially bent.

(11) In the present embodiment, in order to suppress the movement of the bucket 4 in a forward/rearward direction when the lifting arm 200 rotates, the front hinge part 50 serving as the rotation center of the rotation link 300 is formed above the front wheel 2, and the rear hinge part 60 serving as the rotation center of the boom cylinder 20 is located on a rear side of the rear wheel 3 of the vehicle.

(12) In particular, the rotation center of the rear link 70 connected to the first hinge part 110 of the boom support 100 is the same as the rotation center of the boom cylinder 20. In other words, since both ends of the rear link 70 and the boom cylinder 20 are connected to the rear hinge part 60, the number of hinge parts of the rear link 70 and the boom cylinder 20 may be reduced so that a cost for maintenance and repair works as well as a manufacturing cost can be reduced.

(13) The rear hinge part 60 is formed in the main body rear 7 which is provided on the rear side of the vehicle main body 1, and such positioning takes into consideration the rotation of the lifting arm 200 and a movement position of the bucket 4.

(14) The rear link 70 has one end connected to the rear hinge part 60, and an opposite end connected to the first boom support hinge part 110. When the boom support 100 rotates (e.g., in a counterclockwise direction) by an operation of the boom cylinder 20, the rear link 70 serves to move the boom support 100 rearward by a predetermined distance.

(15) The rotation link 300 has one end connected to the front hinge part 50 which is formed vertically above the front wheel 2 of the vehicle, and an opposite end connected to the third boom support hinge part 130 of the boom support 100. When the boom support 100 rotates by the operation of the boom cylinder 20, the rotation link 300 serves to assist the rotation of the boom support 100 and support the lifting arm 200 coupled to the boom support 100.

(16) When the bucket 4 moves vertically upward in a state where the bucket 4 is moved down as shown in FIG. 2, the boom support 100 rotates in a counterclockwise direction while moving rearward by a predetermined length by the operation of the boom cylinder 20, and the rotation link 300 rotates in a clockwise direction at a predetermined angle.

(17) In addition, the rear link 70 rotates in the counterclockwise direction, which is the same as a rotation direction of the boom support 100, at a predetermined angle.

(18) As shown in FIG. 5, a length of the rotation link 300 has to be set such that the third boom support hinge part 130 forms an acute angle with the lifting arm 200 at a height corresponding to an uppermost position of the bucket 4 when the bucket 4 is lifted up.

(19) As described above, since the boom support 100 has the first to third boom support hinge parts, and particularly, since the second boom support hinge part 120 is formed at the position higher than the third boom support hinge part 130, the boom support 100 may be partially curved. In addition, in operation states shown in FIGS. 2 to 5, the second boom support hinge part 120 is designed to be maintained at the position higher than the third boom support hinge part 130 even when the boom support 100 rotates.

(20) With the above structures, the rotation of the rotation link 300 about the front hinge part 50 and the rotation of the boom cylinder 20 and the rear link 70 about the rear hinge part 60 may allow the bucket 4 to vertically move up/down while minimizing forward/rearward fluctuation of the bucket 4.

(21) In the boom support 100, the first boom support hinge part 110 is formed rearward (left side in the drawing) of the vehicle, the third boom support hinge part 130 is formed forward (right side in the drawing) of the vehicle, the second boom support hinge part 120 is disposed forward of the third boom support hinge part 130 when the bucket 4 is located at a lowermost position, and the second boom support hinge part 120 is disposed between the first boom support hinge part 110 and the third boom support hinge part at a height at which the bucket 4 is lifted by a predetermined height or more.

(22) In addition, the front hinge part 50, to which the opposite end of the rotation link 300 having the one end connected to the third boom support hinge part 130 is coupled, is formed under the cabin 5 located on the front side of the vehicle main body 1.

(23) In addition, the opposite end of the rear link 70 coupled to the first boom support hinge part 110 and the opposite end of the boom cylinder 20 coupled to the second boom support hinge part 120 are coupled to the rear hinge part 60. When the bucket 4 is lifted by the operation of the boom cylinder 20, the rear link 70 initially rotates about the rear hinge part 60 in a direction which is the same as a rotation direction of the boom cylinder 20, and then the rear link 70 and the boom cylinder 20 rotate in opposite directions, so that an interval (angle) between the rear link 70 and the boom cylinder 20 becomes narrow. On the contrary, when the bucket 4 moves down after being lifted up, the rear link 70 and the boom cylinder 20 rotate in opposite directions so that the interval (angle) between the rear link 70 and the boom cylinder 20 is increased.

(24) Due to the above configuration, as shown in FIG. 6, when the bucket 4 moves forward/rearward upon the lifting up/down of the bucket 4, the bucket 4 may move very slightly, and there is no inconvenience that the vehicle has to move in the forward/rearward direction.

(25) FIGS. 7 to 9 are views showing the configuration and the operation of the loader work device according to a second embodiment of the present invention.

(26) A cover part for the boom support 100 and the main body rear 7 is shown by solid lines in FIG. 7, and components of the loader work device of the present invention are shown by solid lines in FIG. 8.

(27) Operations of the second embodiment are performed similarly to the loader work device of the first embodiment described above. However, in the second embodiment, the lifting arm 200 to which the bucket 4 is coupled and the boom support 100 are formed in a single configuration, and particularly, the one end of the rotation link 300 is disposed toward a center of the vehicle main body 1.

(28) In other words, in the case of the loader work device of the present invention, the one end of the rotation link 300 is coupled to the front hinge part 50 formed in the vehicle main body 1 or the cabin 5, and the opposite end of the lifting arm 200 is coupled to the third boom support hinge part 130. However, the front hinge part 50 may be located above the front wheel 2, or disposed above between the rear wheel 3 and the front wheel 2.

(29) In addition, depending on a size of the vehicle and a length of the lifting arm 200, the rear hinge part 60 to which the boom cylinder 20 and the rear link 70 are coupled may also be located above the rear wheel 3 of the vehicle or on the rear side of the rear wheel 3.

(30) The loader work device of the second embodiment may also vertically lift up/down the bucket 4 without the forward/rearward fluctuation of the bucket 4 as shown in FIG. 9, and a structure of the loader work device of the second embodiment is also configured such that the boom cylinder 20 and the rear link 70 are coupled to the rear hinge part 60 so that the structure can be simplified.